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Chadwick-Helmuth Vibrex 2000 Plus User Manual

Digital dynamic balancer/analyzer systems
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User Guide No. 13841-6
August 1, 2002
Vibrex
2000
TM
and
Vibrex 2000 Plus
User Guide
Digital Dynamic Balancer/Analyzer
Systems
Chadwick-Helmuth

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Summary of Contents for Chadwick-Helmuth Vibrex 2000 Plus

  • Page 1 User Guide No. 13841-6 August 1, 2002 Vibrex 2000 Vibrex 2000 Plus User Guide Digital Dynamic Balancer/Analyzer Systems Chadwick-Helmuth...
  • Page 2 Printed in the U.S.A. This User Guide is supplied to the User under license, subject to change without notice and/or recall by Chadwick-Helmuth Company, Inc., at any time. The User Guide at all times remains the property of Chadwick- Helmuth Company, Inc. The information contained in this User Guide is considered confidential.

  • Page 3: Table Of Contents

    2.2.1.3 Self-Test Feature ......8 2.2.2 Vibrex 2000 Plus Enhancements ....9 2.3 System Specifications .
  • Page 4 4.2.3 V2K Helicopter and Fixed Wing Kit ....40 4.3 Vibrex 2000 Plus Equipment ......41 4.3.1 V2K Plus Propeller Balance Kits .
  • Page 5 5.4.2.1 Annotating the Reading ..... 79 5.4.2.2 Balance Quality Indicator....79 Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 6 6.2 Theory of Operation ....... . . 118 6.2.1 Digital Subsystem ......118 vi Chadwick-Helmuth Company, Inc.
  • Page 7 6.3.5.2 Instrument Test Procedures for the Vibrex 2000 and Vibrex 2000 Plus ....... 132 6.3.5.3 Approach: .

  • Page 9: Quick Reference Guide

    Quick Reference Guide This guide provides a quick-start reference for the Vibrex 2000 and Vibrex 2000 Plus Digital Dynamic Balancer systems. The term Vibrex unit refers to both systems. Propeller Balance Propeller Balance, Run No. 1 • Install the photocell, velocimeter(s), and reflective tape on the propeller to be balanced.
  • Page 10 Install the Photocell (or magnetic pickup), Strobex, and retro- reflective targets to be viewed. • Power up the Vibrex unit. • Press the TRACK & BALANCE context key from the Main Menu screen. • Operate the aircraft in the desired condition. Chadwick-Helmuth Company, Inc.
  • Page 11 Connect the Vibrex unit to the printer using the appropriate serial interface cable. • Power up the Vibrex unit and select PRINT • Select the reading or reading set wanted to print then press START PRINT Vibrex 2000 and Vibrex 2000 Plus User Guide xi...
  • Page 12 Quick Reference Guide xii Chadwick-Helmuth Company, Inc.

  • Page 13: Chapter 1. Introduction

    1.1 About This User Guide This user guide explains how to install, operate, and maintain the Vibrex 2000 and Vibrex 2000 Plus systems. The text sets out the basic procedures required to accomplish dynamic balancing with optimum results, using these systems.

  • Page 14: Organization

    CAUTION: Be careful with this procedure or item because of possible damage to equipment or loss of data. • WARNING: Exercise extreme care with this procedure or item because of possible personal injury. Special notices appear in the format shown here. Chadwick-Helmuth Company, Inc.

  • Page 15: Document Conventions

    Vibrex 2000 display screen. • Vibrex 2000 and Vibrex 2000 Plus key names appear in boldface and all-caps. Dedicated keys appear in bold, like START , but context keys...

  • Page 16: Product Support

    Call this number Monday through Friday between 8:00 a.m. and 4:30 p.m. Pacific Time. If at all possible, fax a copy of a customer support report in care of Vibrex 2000 and Vibrex 2000 Plus support before calling. NOTE: If necessary, check with the Product Support Department for an update on the latest part and software revisions.

  • Page 17: Chapter 2. System Overview

    Model 177M and Model 8350 “ring-of-lights” Vibrex products developed for rotary-wing applications. • The Vibrex 2000 and Vibrex 2000 Plus are not limited to the aircraft field. Like their predecessors, these products are usable in a wide range of uses, including agricultural, forest product-related, marine, and industrial applications.

  • Page 18: Product Description

    Vibrex 2000 and Vibrex 2000 Plus-related terms that may not be familiar to the user. Keep in mind that the Vibrex 2000 Plus system has all the capabilities of the Vibrex 2000. In addition, it has the added features and benefits listed under Section 2.2.2 “Vibrex 2000 Plus Enhancements”...

  • Page 19: System Operations

    Product Description 2.2.1.1 System Operations The Vibrex 2000 and Vibrex 2000 Plus systems allow the user to do the following operations: Propeller Balance Operations - Easy-to-understand menus let the user initiate up to four different balancing jobs at one time. The instrument...

  • Page 20: System Benefits

    Chadwick-Helmuth's legendary worldwide customer support 2.2.1.3 Self-Test Feature Each time Vibrex 2000 or the Vibrex 2000 Plus unit is powered up, it checks its memory and characterizes its analog filters to compensate for aging components, temperature drifts, and so on. The unit then reports the total amount of time the batteries have been used since installation.

  • Page 21: Vibrex 2000 Plus Enhancements

    Product Description 2.2.2 Vibrex 2000 Plus Enhancements The Vibrex 2000 Plus model represents a significant performance increase over the Vibrex 2000 (Part Number 13590-2 and earlier). In addition to all existing Vibrex 2000 benefits features, and capabilities, the Vibrex 2000 Plus system offers the following extended capabilities.

  • Page 22: System Specifications

    Chapter 2 - System Overview 2.3 System Specifications The tables in this section provide complete lists of the Vibrex 2000 and Vibrex 2000 Plus systems’ technical specifications. 2.3.1 Vibrex 2000 Specifications The table, starting below, lists complete technical specifications for the Vibrex 2000 system.
  • Page 23 0 to 380 mV peak (20 IPS) Input sensitivity 19 mV/IPS peak Signal Conversion (Magnetic Pickup Inputs) Input frequency range 100 to 50,000 RPM RPM accuracy 0.15% Input voltage range 0.5V to 12.0V peak nominal, diode protected Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 24 • Width - 7.25 • Depth - 1.81 Weight 3.5 lb nominal Mating connector type D-sub, 9-pin (PC to printer) Power requirement 3 to 6.4 Vdc, 250 mA Battery life (typical) 40 hr Case material Aluminum alloy Chadwick-Helmuth Company, Inc.

  • Page 25: Vibrex 2000 Plus Specifications

    Balance jobs, log book, balance, spectrum, contents and formats fault log, all in ASCII format Compatible software Chadwick-Helmuth V2K Download and (ground based) V2K Plot programs Basic Performance Frequency range 0 to 10,000 Hz Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 26 Type - ac High-pass filter 3-pole Chebyshev, -3.0 dB @ 1.5 Hz Analog-to-digital 13-bit converter type Spurious free dynamic > 50 dB range Input ranges 0 to 380 mV peak (20 IPS) Input sensitivity 19 mV/IPS peak Chadwick-Helmuth Company, Inc.
  • Page 27 Depth - 1.81 Weight 3.5 lb nominal Mating connector type D-sub, 9-pin (PC to printer) Power requirement 3 to 6.4 Vdc, 250 mA Battery life (typical) 40 hr Case material Aluminum alloy Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 28 Chapter 2 - System Overview Characteristic Specifications (Continued) Environmental Conditions Temperature 0°C to 50°C Electromagnetic Industrial Electronic Control Equipment interference (EMI) Class certified to susceptibility and • Class Standard EN50081-2 radiated emissions • Standard EN50082-2 standards Chadwick-Helmuth Company, Inc.

  • Page 29: Chapter 3. Getting Started

    3.1 Getting Started: Introduction This chapter gives a general explanation of how to get started using the Vibrex 2000 and Vibrex 2000 Plus systems. In general, the basic and startup features of both systems are the same. Where there are differences between the two Vibrex units, they are explained in detail.

  • Page 30: Basic Features

    Vibrex 2000 Plus offer the user. Diagram - The illustration below shows a picture of the Vibrex 2000 unit. Except for the logo, the Vibrex 2000 Plus is identical. Use this diagram to locate the operating features explained in this chapter. CONNECTION INTERFACES...

  • Page 31: Display

    Basic Features 3.2.1 Display The Vibrex 2000 and Vibrex 2000 Plus use an LCD screen on the front panel, for visual output. This screen subdivides into eight lines of text. CAUTION: In extreme temperatures, the display may turn black (too hot), or blank (too cold). In hot climates, covering the display from direct sunlight is generally sufficient to prevent the screen from becoming unreadable.

  • Page 32: Self-Test Screen

    145 for details on troubleshooting. 3.2.2 Keypad The Vibrex 2000 and Vibrex 2000 Plus have a simple, easy-to use keypad on the front panel, for entering data and doing operations. This keypad has the following general types of keys: •...

  • Page 33: Dedicated Keys

    E three times, and so on. 3.2.2.2 Dedicated Keys The Vibrex 2000 and Vibrex 2000 Plus have several dedicated keys that perform often-used functions. Find these keys next to the alpha-numeric keypad. The following list names the dedicated keys and gives their uses: ON/OFF The power button see Section 5.2 “Beginning...

  • Page 34: Context Keys

    These keys perform operations relevant to the screen currently displayed, for example, data entry, channel selections, or making other choices. 3.2.3 Channel Configuration The table below shows the Vibrex 2000 and Vibrex 2000 Plus units’ channel configuration choices. RPM A RPM B Velocimeter No.

  • Page 35: Printing Data

    3.3 Printing Data The Vibrex 2000 and Vibrex 2000 Plus allow the user to print hard-copy readouts of collected data or status information. The systems print through an RS-232 serial port on the connector subpanel. Because of the large selection of serial printers, it is impossible to address every setup for every printer.

  • Page 36: Basic Settings

    Chapter 3 - Getting Started 3.3.1.1 Basic Settings See the following table for a list of the basic settings to use for downloading data from the Vibrex 2000 or Vibrex 2000 Plus to any printer and/or serial interface. Parameter Setting...
  • Page 37 See page 26 for an example of the settings printout. CAUTION: Never turn the printer off while it is writing the new settings to memory. Always wait until the DIP SW setting complete message is printed, then turn the power off. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 38 4 (ON) : Busy Control = H/W Busy 5 (OFF) : Baud 6 (ON) Rate 7 (ON) Select 8 (ON) = 9600 bps Continue? : Push ‘On-line SW’ Write? : Push ‘Paper feed SW' DIP SW setting complete!! Chadwick-Helmuth Company, Inc.

  • Page 39: Printing With A Pc

    3.3.2 Printing With a PC This section explains how to print in a Windows 95, Windows 98, or Windows NT environment. Connect the Vibrex 2000 or Vibrex 2000 Plus to the PC with a nine-pin serial connector, used by most computers.
  • Page 40 14129 software on your PC, following the instructions on the floppy disk. Download Vibrex 2000 or Vibrex 2000 Plus data, using the V2K Download Software program, as follows: 1. Connect the Vibrex unit to your PC, using the 9-pin DBA female connector to a 9-pin DBA female connector.

  • Page 41: Reading Fft Data

    3.3.3 Reading FFT Data One of the types of data available to print in the Vibrex 2000 or Vibrex 2000 Plus spectral data file is called raw FFT. Fast Fourier transform (FFT) is a method used to record vibration spectra digitally. An FFT consists of individual bins (also called lines).

  • Page 42: Using The Print Key

    The value in storing the vibration measurements as FFT data lies in its PC versatility. The user can create plots and graphs of the data, using the Chadwick-Helmuth V2K Plot Software program. For details on how to use this program to plot FFT data, see the V2K Plot Software User Guide.

  • Page 43: Global Printing

    Printing Data 3.3.4.1 Global Printing After powering up the Vibrex 2000 or Vibrex 2000 Plus, the user may press the PRINT key to access a global Print menu. From this menu, the user may select an option under any of the following context keys: •...
  • Page 44 PRINT The resulting printout shows the status of the Vibrex 2000 or Vibrex 2000 Plus and includes a fault log. If the unit cannot operate or if there is an error in operation, the Vibrex unit makes an appropriate entry in the fault log.

  • Page 45: Printing With Review And Print Keys

    FFT data for any individual spectrum. Bal Measurement Select the measurement to be printed and press PRINT . Select <CURRENT MEAS> then press START PRINT Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 46 Chapter 3 - Getting Started Chadwick-Helmuth Company, Inc.

  • Page 47: Chapter 4. Installation

    4.1 Installation: Introduction ............35 4.2 Vibrex 2000 Basic Equipment..........36 4.4 General Installation ..............48 4.5 Sample Installations ..............59 4.1 Installation: Introduction The Vibrex 2000 and Vibrex 2000 Plus accept the following types of transducer inputs: • Velocimeter •...

  • Page 48: Vibrex 2000 Basic Equipment

    Chapter 4 - Installation In addition, this chapter contains lists of Vibrex 2000 or Vibrex 2000 Plus-related equipment, as well as descriptions of some sample aircraft installations. For more information, refer to The Smooth Propeller manual. Upgrade Kit - The user may easily upgrade the Vibrex 2000 system to a Vibrex 2000 Plus system.

  • Page 49: V2K Single-Engine Kits

    Vibrex 2000 Basic Equipment 4.2.1.1 V2K Single-Engine Kits The following table shows a list of Chadwick-Helmuth equipment and accessories available with the Vibrex 2000 system for single-engine propeller balance operations: Qty. Description Part No. Vibrex 2000 Balancer 13590-3 Propeller Protractor...

  • Page 50: V2K Twin-Engine Kits

    Chapter 4 - Installation 4.2.1.2 V2K Twin-Engine Kits The following table shows a list of Chadwick-Helmuth equipment and accessories available with the Vibrex 2000 or Vibrex 2000 Plus system for twin-engine propeller balance operations: Qty. Description Part No. Vibrex 2000 Balancer...

  • Page 51: V2K Rotor Track & Balance Kits

    Vibrex 2000 Basic Equipment 4.2.2 V2K Rotor Track & Balance Kits The following table shows a list of Chadwick-Helmuth equipment and accessories available with the Vibrex 2000 or Vibrex 2000 Plus system for helicopter rotor track-and-balance operations: Qty. Description Part No.

  • Page 52: V2K Helicopter And Fixed Wing Kit

    No. 13841-6 V2K Helicopter Training Video (VHS) 610-453 4.2.3 V2K Helicopter and Fixed Wing Kit The following table shows a list of Chadwick-Helmuth equipment and accessories available with the Vibrex 2000 system for helicopter rotor and fixed wing kit: Qty.

  • Page 53: Vibrex 2000 Plus Equipment

    V2K Fixed Wing Training Video (VHS) 610-455 4.3 Vibrex 2000 Plus Equipment This section provides a series of tables that list the different types of equipment available with the Vibrex 2000 Plus systems. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 54: V2K Plus Propeller Balance Kits

    Chapter 4 - Installation 4.3.1 V2K Plus Propeller Balance Kits Each Vibrex unit (Vibrex 2000 and Vibrex 2000 Plus) has the following separate types of fixed-wing kits for propeller balance: • Single-engine • Twin-engine 4.3.1.1 V2K Plus Single-Engine Kit The following table shows a list of Chadwick-Helmuth equipment and...

  • Page 55: V2K Plus Twin-Engine Kit

    V2K Fixed Wing Training Video (VHS) 610-455 4.3.1.2 V2K Plus Twin-Engine Kit The following table shows a list of Chadwick-Helmuth equipment and accessories available with the Vibrex 2000 or Vibrex 2000 Plus system for twin-engine propeller balance operations: Qty. Description Part No.

  • Page 56: V2K Plus Rotor Track & Balance Kit

    Chapter 4 - Installation 4.3.2 V2K Plus Rotor Track & Balance Kit The following table shows a list of Chadwick-Helmuth equipment and accessories available with the Vibrex 2000 or Vibrex 2000 Plus system for helicopter rotor track-and-balance operations: Qty. Description Part No.

  • Page 57: V2K Plus Helicopter & Fixed Wing Kit

    No. 13841-6 V2K Helicopter Training Video (VHS) 610-453 4.3.3 V2K Plus Helicopter & Fixed Wing Kit The following table shows a list of Chadwick-Helmuth equipment and accessories available with the Vibrex 2000 system for helicopter rotor and fixed wing kit: Qty.
  • Page 58 The Smooth Propeller Manual (Version 2) 9511-2 Manual Chart Fundamentals 8016 V2K Combo Download/Plot Software 15178 Vibrex 2000 and Vibrex 2000 Plus User User Guide Guide No. 13841-6 V2K Helicopter Training Video (VHS) 610-453 V2K Fixed Wing Training Video (VHS) 610-455 Chadwick-Helmuth Company, Inc.

  • Page 59: Optional Equipment

    Vibrex 2000 Plus Equipment 4.3.4 Optional Equipment The following table shows a list of optional Chadwick-Helmuth and other equipment/accessories not included in either the Vibrex 2000 or Vibrex 2000 Plus kits for rotor or propeller, but are helpful for general operations: Qty. Description Part No.

  • Page 60: Carrying Case

    4.4 General Installation This section explains general installation procedures for the Vibrex 2000 and Vibrex 2000 Plus systems. The connector subpanel at the top of the unit contains all the major installation interfaces for input and output. Chadwick-Helmuth Company, Inc.
  • Page 61 (PC), a printer, or the Strobex Connector Description - The diagram below shows an illustration of the connector subpanel. PC OR PRINTER INTERFACE OR STROBEX SYNCHRONIZATION OUT PULSE Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 62: Velocimeters

    In general, the user may use guidelines given in The Smooth Propeller to determine correct Velocimeter placement with the Vibrex 2000 or Vibrex 2000 Plus system. In addition, the user may use the following general guidelines for making sure the Velocimeters are in the correct locations: •...

  • Page 63: Photocell System

    4.4.2 Photocell System The operational end of the Vibrex 2000 or Vibrex 2000 Plus photocell system is the Banner photocell probe (from now on called the photocell). This unit is self-contained and uses a visible red light (650 nm) from a light-emitting diode (LED) triggered by a retro-reflective target.

  • Page 64: Retro-Reflective Target

    The orientation of the photocell can also vary, depending on the size of the target. A single strip of the Chadwick-Helmuth retro-reflective target, aligned so it dwells in the photocell beam for the longest period of time, is usually adequate.

  • Page 65: General Photocell Use

    The photocell is used in the sourcing mode. The wire color codes are shown in the table below. Color Source Brown +10-30 Vdc Blue DC Common Black Signal Source White Signal Sink Not Used Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 66: Photocell Placement

    This LED is the alignment indicator. As the LED pulses faster (at a higher rate), it indicates better alignment. However, if the pulse rate is too fast to observe, the user must reduce the size of the target. Chadwick-Helmuth Company, Inc.
  • Page 67 For example, light reflected from a shiny surface that enters the photocell probe is incident light. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 68: Target Positioning

    Rotate the component to be balanced to a position where a blade or some easily identifiable part of the rotating assembly crosses the photocell beam. Place a single retro-reflective target strip aligned tangentially on the rotating component, where the target is illuminated by the photocell’s beam. Chadwick-Helmuth Company, Inc.

  • Page 69: Magnetic Pickup

    Refer to the appropriate Chadwick-Helmuth Model 177M-6A Vibrex checklist for magnetic pickup installation, if other documentation is inadequate. The installation for the Vibrex 2000 and Vibrex 2000 Plus is the same. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 70 RPM of 2400. The same target to provide the same dwell (length of time) in the beam at the 30-in. station would have to be approximately 2 in. long. For details on calculating photocell tape length, see “Appendix: Photocell Taping” on page 157. Chadwick-Helmuth Company, Inc.

  • Page 71: Sample Installations

    Sample Installations 4.5 Sample Installations This section gives a brief explanation of several Vibrex 2000 and Vibrex 2000 Plus installations on selected aircraft and some general types of aircraft. Use these summaries as guidelines for the user’s own installation operations.

  • Page 72: Flat Opposed General Rules

    To determine the engine revolutions per minute (RPM) from the photocell, check the engine data plate and apply the resulting ratio to the tachometer reading from the propeller. NOTE: The propeller tachometer signal from the photocell does not match the engine tachometer RPM. Chadwick-Helmuth Company, Inc.

  • Page 73: Chapter 5. General Operation

    After a brief description of the Vibrex unit’s front panel, the rest of this chapter explains how to operate the Vibrex 2000 and Vibrex 2000 Plus to achieve these basic purposes, including propeller balance, as well as helicopter track-and-balance operations.

  • Page 74: Beginning Operation

    5.2 Beginning Operation This section explains the first steps in starting to use the Vibrex 2000 and Vibrex 2000 Plus, including how to power up and how to use the initial screens the user sees directly afterward. 5.2.1 Powering Up...

  • Page 75: Main Menu Screen

    Beginning Operation 5.2.2 Main Menu Screen Directly after the Vibrex 2000 or Vibrex 2000 Plus powers up, the Self- test screen displays (telling the user the unit is testing itself), then the Main Menu screen. The illustration below shows the Main menu.
  • Page 76 Track and Balance Used to acquire readings and select the Chadwick-Helmuth Model 135M-12 Strobex Tracker for a visual blade track of propellers and helicopter rotors. Spectrum Analysis Used to identify sources of vibration. The...

  • Page 77: Basics Of Operation

    Basics of Operation 5.3 Basics of Operation Operate the Vibrex 2000 and Vibrex 2000 Plus, using the front panel. The illustration below shows views of this panel, with the most important keys and their locations called out. GO BACK KEY...

  • Page 78: Propeller Balancing

    Use the context keys to the left of the menu option names on screen, to access the features listed. The Main Menu screen offers the user the Vibrex 2000 and Vibrex 2000 Plus’ operating features listed in the example shown above.
  • Page 79 Propeller Balancing Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 80: Propeller Balance Setup

    To begin a propeller balance operation, press the context key next to the Main Menu screen option PROPELLER BALANCE. The Vibrex 2000 and Vibrex 2000 Plus display the first of two Propeller Balance Setup screens. This set of screens allows the user to enter basic balance setup information.

  • Page 81: Selecting Channels

    The Vibrex unit defaults to the following channel assignments: • CHANNEL <1A> for the balance channel located nearest the plane of the propeller with the notation “PROP CHAN” • <NONE> for the rear check Velocimeter Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 82: Entering Horsepower

    5.4.1.3 Entering Horsepower Press Use the context key to set the Vibrex unit for START. HP ENGINE the propeller being balanced. Since high horsepower engines necessarily require bigger and heavier propellers, this method works well for setting weight sensitivity. Chadwick-Helmuth Company, Inc.
  • Page 83 In cases like these, use the next-lower horsepower range than the one normally used. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 84: Setting Sensitivity

    The angular performance when weight is added to the blade with the reflective target Enter this information, using the Set Sensitivity screen. Access this screen by pressing the SET SENSITIVITY context key from the second Propeller Balance Setup screen (see the illustration on page 71). Chadwick-Helmuth Company, Inc.
  • Page 85 If these sensitivities are known from having balanced a similar installation in the past, the user may enter them manually for a high probability of achieving a balance in two engine runs. The sections that follow explain these concepts. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 86 • The user can accommodate most of the mounting differences from engine to engine by using the Chadwick-Helmuth Propeller Protractor. For instructions on how to use this tool, see Section 5.4.3.2 “Using the Propeller Protractor” on page 82.

  • Page 87: Multiple Propeller Feature

    Use the PROPELLER BALANCE option in the Main Menu screen to access this feature. Begin propeller balance operations in the same way as the user would for theVibrex 2000. See Section 5.4.1 “Propeller Balance Setup” on page 68 for details. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 88 Chapter 5 - General Operation Do a Vibrex 2000 Plus multiple-propeller balance operation, as follows: 1. From the Main Menu screen, select the PROPELLER BALANCE option. The first Balance Propeller Setup screen displays (see below). PROPELLER BAL SETUP AIRCRAFT ID[ ENG[ ] PROP ch<1A>...

  • Page 89: Acquiring Balance Readings

    2. Operate the propeller at the desired RPM (shown live on the Vibrex unit’s display). 3. Press START The Vibrex unit collects IPS-reading and phase data/measurements. During this process, a temporary Data Collection screen displays. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 90 RPM. Do not attempt a balance with the propeller stalling, because the resulting balance reading in this situation is inaccurate. A propeller is stalling if there is a noticeable change in the propeller’s sound, from what the user normally hears. Chadwick-Helmuth Company, Inc.

  • Page 91: Annotating The Reading

    (see above). In addition to the bar graph, there is a text label under the graph that indicates the general balance and vibration level achieved (good in the example above). Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 92 INSTALL PERMANENTLY Press if the user needs to move the weight inside the spinner. Pressing this key accesses the Split Weights and Radius Change menus. Chadwick-Helmuth Company, Inc.

  • Page 93: Obtaining Balance Solutions

    Just enter the actual applied weight and/ or angle. CAUTION: Failure to enter the actual values used degrades the next solution and may not improve the propeller’s balance. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 94: Using The Propeller Protractor

    3. ALIGN ARROW ON PROTRACTOR VELOCIMETER WITH ARROW ON PROP VELOCIMETER BODY SO ARROWS ARE PARRALLEL AND IN THE SAME DIRECTION. 4. ADD WEIGHT TO ANGLE ON PROP AS SPECIFIED BY BALANCER SOLUTION AND ANGLE ON PROTRACTOR. Chadwick-Helmuth Company, Inc.
  • Page 95 During placement of the target on installation, it is easy to turn the propeller so the pulsating reflecting light just goes out after passing the beam of the photocell. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 96: Changing Performed Solutions

    NO, GO BACK to edit 5.4.4 Finishing Propeller Balance The weights outside on the spinner are not a permanent installation. The user must move the weights to a permanent location according to the guidelines found in The Smooth Propeller Manual (Chadwick-Helmuth). Chadwick-Helmuth Company, Inc.

  • Page 97: If Unable To Use Weight Azimuth

    The Vibrex unit calculates the required weight on each point. NOTE: As the weight is split farther apart, the required weight becomes greater because of the lower combined arm of the weight from the center of rotation. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 98: Reviewing Balance Histories

    Review balance histories and other past data, as follows: 1. Return to the Main Menu screen. NOTE: Even though REVIEW is a dedicated key, it does not work unless the Main Menu screen is displayed. 2. From this screen, press REVIEW Chadwick-Helmuth Company, Inc.

  • Page 99: Reviewing Propeller Balance Measurements

    NOTE: A day/date code also displays to identify the run uniquely from any other run. The day/date coding is performed automatically at the time the reading was taken. The channel from which the reading was taken displays immediately after the day/date code. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 100: Reviewing Other Balance Measurements

    2. The user may go directly to another run by pressing the NEXT RUN PREV RUN context key. 3. The user may skip to any measurement stored by pressing the context key and entering the run number the user MEASUREMENTS wants to view. Chadwick-Helmuth Company, Inc.

  • Page 101: Reviewing Spectrum Peak Measurements

    2. To view the orders press the context key next to the <RPM PEAK IPS> label. NOTE: The Vibrex 2000 Plus also allows you to review a spectrum graph plot. See Section 5.6.4 “Spectrum Viewer Feature” on page 114 for details.

  • Page 102: Helicopter Rotor Balancing

    Model 135M-12 Strobex Tracker. This section explains, in general, how to use the Vibrex 2000 and Vibrex 2000 Plus for typical rotor track-and-balance operations. The diagram on page 91 shows a sample setup for a helicopter main rotor.
  • Page 103 Helicopter Rotor Balancing Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 104: Main Rotor Track

    12 or 24 Vdc 135M-11 24 Vdc only NOTE: The Strobex does not operate on a 12V battery but does work on an active (charging) 12-Vdc buss. The voltage required to operate the Strobex is approximately 13.5V. Chadwick-Helmuth Company, Inc.
  • Page 105 BLADE SPREAD BLADE SPREAD < ON> TOGGLE SPREAD FACTOR <2> ENTER THE SPREAD FACTOR NUMBER OF BLADES<3> 0 RPM FRM CH<A> DISPLAYS LIVE RPM READING pull strobe trigger FROM THE DESIGNATED Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 106: Main Rotor Balance

    The user can store up to 50 balance readings (total), after which the first readings are overwritten. NOTE: The readings from the Vibrex unit are compatible with the paper balance graphs used with the Chadwick-Helmuth Model 177M and Model 8350 Vibrex Balancers. Chadwick-Helmuth Company, Inc.
  • Page 107 6. Read the changes specified on the heavy border and apply these changes to the rotor system. 7. When the user is finished, press the GO BACK key as many times as necessary to return to the Main Menu screen. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 108: Using The Rotor Protractor

    11:00. See illustrations on page 97 and page 98. For more information on tail rotor balancing with the Vibrex 2000 or Vibrex 2000 Plus, see Section 5.5.4 “Tail Rotor Balance” on page 104. Chadwick-Helmuth Company, Inc.
  • Page 109 Helicopter Rotor Balancing Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 110 Balance Chart for Hughes 369H, 369HS Tail Rotor Strobex Run # Run # Run # Run # Run # .7 IPS 10:20 Adjustment before next run 1 HOUR 1 HOUR TARGET TARGET PITCH LINK BLANK PITCH LINK BLANK Chadwick-Helmuth Company, Inc.
  • Page 111 Run # Run # Run # Run # Run # .7 IPS 10:20 Adjustment +.27 BLANK TIP +3.5 TGT PCL before next run TARGET TARGET PITCH LINK 9:00 BLANK PITCH LINK BLANK Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 112: Counter-Clockwise Rotor Correction

    If the move line is longer than the distance to the zero line, decrease the adjustment proportionally. • If the move line is shorter than the distance to the zero line, increase the adjustment proportionally. For an illustration, see the diagram on page 101. Chadwick-Helmuth Company, Inc.
  • Page 113 Adjustment +.27 BLANK TIP before next run +3.5 TGT PCL MAKE THIS CHANGE ONLY DIFFERENCE BETWEEN WHERE POINT SHOULD TARGET HAVE GONE AND DID TARGET PITCH LINK 9:00 BLANK PITCH LINK BLANK Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 114 Once the user plots the second point again on the chart, the new adjustment brings the rotor into balance. See illustration on page 103. Chadwick-Helmuth Company, Inc.
  • Page 115 Helicopter Rotor Balancing Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 116: Clockwise Rotor Correction

    Main Menu screen to acquire a TRACK & BALANCE balance reading. 4. Operate the aircraft in the appropriate balance regime and select the channels for the tail rotor. The Vibrex unit automatically begins to acquire readings. Chadwick-Helmuth Company, Inc.

  • Page 117: Clockwise Rotors

    1. Obtain a reading from the Vibrex unit’s screen displays. 2. Obtain the correct paper polar chart for use with the subject tail rotor. The user may use a manufacturer’s chart from the maintenance manual or one supplied from Chadwick-Helmuth. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 118: Tail Rotor Track

    Make sure the retro-reflective target that triggers the photocell probe is in line with the probe beam. 2. Apply a thin retro-reflective target along the chord line on one blade tip and across the chord line on the other blade tip. Chadwick-Helmuth Company, Inc.
  • Page 119 3. Place the Vibrex unit at the root of the tail boom. See the illustration below. PLACE VIBREX UNIT (WITH STROBEX) HERE 4. Plug the Strobex into the tracking cable and the tracking cable into the serial port on the connector subpanel. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 120 13. Judge the correct track by how far away from the tail boom the targets appear or by how far from left to right the targets appear, relative to each other. Chadwick-Helmuth Company, Inc.

  • Page 121: Spectrum Analysis

    After any type of balance operation, if the user feels additional vibrations, the user can use the Spectrum Analysis feature of the Vibrex 2000 and Vibrex 2000 Plus to determine the probable source of the vibration. This feature allows the user to collect extensive, detailed spectral data.
  • Page 122 4. Select the range of interest (active orders) by pressing the (Vibrex 2000) or 0-<24,000>RPM 0-<600,000>RPM (Vibrex 2000 Plus) context key. See Section 5.6.1.1 “Ranging Feature” on page 111 for details. Frequency Ranges - The available Spectrum Analysis feature frequency ranges (in RPM) for the Vibrex 2000 are •...

  • Page 123: Ranging Feature

    The default range is 0 to 24,000 RPM for the Vibrex 2000 and 0 to 600,000 for the Vibrex 2000 Plus. If the user is using the Vibrex 2000 and encounter high peaks above 10,000 RPM, all the available peaks may not show up.

  • Page 124: Order Analysis

    In this case, press the adjacent context key to list additional peaks. Note that details of this screen on the Vibrex 2000 Plus may differ. NOTE: The Vibrex 2000 Plus displays the Spectrum View screen first. See Section 5.6.4 “Spectrum Viewer Feature” on page 114 for details.
  • Page 125 [ANNOTATE ] LIST 1 NOTES TO ONE’S SELF 25SEP96 09:56:46 1A <ORDER @ 500 RPM> DATE, TIME, AND 0.00 IPS CHANNEL NUMBER 0.86 IPS 0.01 IPS 0.00 IPS LIST OF 0.01 IPS VIBRATION ORDERS Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 126: Spectrum Viewer Feature

    GO BACK 5.6.4 Spectrum Viewer Feature The Vibrex 2000 Plus allows the user to view spectral graph plots of vibration data. Use the SPECTRUM ANALYSIS option in the Main Menu screen to access this feature. NOTE: This feature is only available with the Vibrex 2000 Plus system.
  • Page 127 See Section 5.6.2 “Collecting Spectral Data” on page 111 for detailed information on these screens. All other spectrum features with the Vibrex 2000 Plus operate in the same way as they do with the Vibrex 2000 model. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 128: Displaying Cursor Data

    Chapter 5 - General Operation 5.6.4.2 Displaying Cursor Data The Vibrex 2000 Plus also allows the user to display specific data associated with the current cursor position. Do this action, as follows: 1. In the Spectrum Viewer screen, place the cursor on the desired peak.

  • Page 129: Chapter 6. Maintenance

    6.1 Maintenance: Introduction This chapter provides general maintenance procedures the user can perform on the Vibrex 2000 and Vibrex 2000 Plus in the field, including the personal computer (PC) interface. Advanced maintenance operations do not appear in this user guide. For repairs that require sophisticated technical assistance, the user must return the unit to the factory (see Section 1.2 “Product Support”...

  • Page 130: Theory Of Operation

    Chapter 6 - Maintenance 6.2 Theory of Operation The Vibrex 2000 and Vibrex 2000 Plus acquire, display, process, and analyze vibration data for fault analysis and balance correction. The following basic subsystems make up the Vibrex unit, as explained in this section: •...

  • Page 131: Display Subsystem

    12 bits to signify the number plus one for the sign (+ or -). A timing processor unit (TPU) in the microprocessor controls the sampling. A hardware state machine that uses discrete logic coordinates the data exchange between the microprocessor and the ADC. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 132: Azimuth Signal

    (from the magnetic pickup or photocell) to digital logic levels. The detector picks up peak pulse levels as low as 0.5V. The digital signal then goes to the microprocessor TPU for calculating periods and phase references. Chadwick-Helmuth Company, Inc.

  • Page 133: Power Subsystem

    All power supplies reside on the main PCB. There are three, as explained in this section. Power Supply, 12V - The 12V supply powers the other supplies, the Velocimeter sensors and, through a microprocessor-controlled power switch, the photocell probe. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 134: Short-Circuit Protection

    CAUTION: These operations do not damage the unit, but could cause the loss of memory contents and/or data. 6.3 Routine Servicing This section explains routine maintenance and servicing procedures the user may do with the Vibrex 2000 and Vibrex 2000 Plus to ensure optimum performance. Chadwick-Helmuth Company, Inc.

  • Page 135: Batteries And Replacement

    30 min. However, this action shorts out the battery and heats it up enough to rupture, causing severe internal damage to the Vibrex unit. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 136: Battery Insertion Diagram

    6.3.1.4 Removal Remove batteries from the Vibrex unit, as follows: 1. Using a Phillips screwdriver, turn the large Phillips screw on the unit’s battery end plate (15), one quarter turn counter-clockwise. 2. Carefully remove the battery end plate. Chadwick-Helmuth Company, Inc.

  • Page 137: Reinstallation

    Wait 5 seconds. Read BATT voltage. NOTE: Fresh batteries should produce a reading greater than 6.0 volts. A reading of less than 3.5 volts may indicate a reversed battery and orientation should be double-checked. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 138: Setting Battery Time

    CAUTION: After the user replaces an EPROM chip, the battery time automatically resets to zero. 6.3.2 EPROM Replacement The EPROM chip in the Vibrex 2000 or Vibrex 2000 Plus defines the features contained in the unit and has a version number that corresponds to these features.

  • Page 139: Getting Started

    Phillips screw (16) counter-clockwise, using the No. 1 Phillips screwdriver. 2. Remove the batteries (20). 3. Remove the four 4-40 (03) screws holding the shield to the bottom of the chassis. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 140 EPROM chip replacement procedure: 1. Remove the battery end plate (15), as explained in the previous set of procedures (steps 1 through 4). 2. Remove the two nuts holding the serial connector to the connector end plate (4). Chadwick-Helmuth Company, Inc.

  • Page 141: Panel Retention Screws

    This section explains basic housekeeping-type operations the user needs to perform with the Vibrex unit. Before cleaning, disassemble the unit in the same way as the user would for EPROM replacement (see Section 6.3.2.3 “Replacement Procedures” on page 127). Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 142: Testing

    6.3.5 Testing We recommend that the user perform a yearly function test end to end, on the Vibrex 2000 and Vibrex 2000 Plus. If the readings obtained during this test are within the unit’s specifications for that reading in frequency, amplitude, and phase, then the unit is operating correctly.
  • Page 143 17. Readings should be.8 IPS +/-.08 IPS at 9:00 o’clock, +/- 1 hour and RPM should read 1800 +/-10 RPM. 18. Perform the same tests using channel 2 and B. 19. Press GO back and initiate a Strobe Track. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 144: Instrument Test Procedures For The Vibrex 2000 And Vibrex 2000 Plus

    23. Observe 4 stems on C-H logo of calibrator strobe disc. 24. If these readings are observed, unit is serviceable. 6.3.5.2 Instrument Test Procedures for the Vibrex 2000 and Vibrex 2000 Plus The following tests provide the highest confidence that the instrument is accurately measuring the incoming sensor signals.

  • Page 145: Procedure

    5. Press “TRACK & BALANCE” from the main menu of the EUT. 6. Acquire a balance measurement on channel 1A, and record the measurement parameters on the data sheet. 7. Press Spectrum Analysis from the main menu. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 146: For The Vibrex 2000 (Basic)

    RPM +/-3.6 5 Hz 1,500 13.44 0.90 <X< 1.11 20 Hz 3,000 13.44 0.90 <X< 1.11 80 Hz 6,000 13.44 0.90 <X< 1.11 160 Hz 12,000 13.44 0.90 <X< 1.11 320 Hz 24,000 13.44 0.90 <X< 1.11 Chadwick-Helmuth Company, Inc.

  • Page 147: For The Vibrex 2000 Plus

    0.85 <X< 1.18 10,000 Hz 600,000 13.44 0.85 <X< 1.18 Move the vibration and azimuth cables to channels 2 and B respectively. Repeat steps 4 through 8 and fill out the following table: Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 148: Clearing Memory Contents

    13.44 0.85 <X< 1.18 Note: If Digital balancer is found to be out of Spec’s contact Chadwick-Helmuth Product Support. 6.3.6 Clearing Memory Contents 6.3.6.1 Vibrex 2000 There is a global clear of all memory contents invoked by pressing the zero “O” key during the power up self test.

  • Page 149: Complete Unit Disassembly

    Routine Servicing 6.3.7 Complete Unit Disassembly This section explains how to completely disassemble and reassemble the Vibrex 2000 and Vibrex 2000 Plus units, under the following topics: • Section 6.3.7.1 “Parts List” on page 142 • Section 6.3.7.2 “Disassembly” on page 143 •...
  • Page 150 Chapter 6 - Maintenance Vibrex 2000 PN 13590-3 and Vibrex 2000 Plus PN 14990 Chadwick-Helmuth Company, Inc.
  • Page 151 Routine Servicing Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 152 Chapter 6 - Maintenance Vibrex 2000 PN 13590-2 Chadwick-Helmuth Company, Inc.
  • Page 153 Routine Servicing Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 154: Parts List

    Chapter 6 - Maintenance 6.3.7.1 Parts List The following table lists the Vibrex 2000 and Vibrex 2000 Plus parts called out in the procedures given in this chapter (and related parts), including their names, part, and reference numbers: Ref. Part Part Name Qty.

  • Page 155: Disassembly

    3. Remove the battery end plate (15) by turning the large Phillips screw (16) counter-clockwise with the Phillips screwdriver. 4. Remove the batteries (20). 5. Remove the four 4-40 screws (03) from the shield (02) with a Phillips-head screwdriver. Vibrex 2000 and Vibrex 2000 Plus User Guide...

  • Page 156: Assembly

    138 and Section 6.3.1.5 “Reinstallation” on page 125. NOTE: Unit does not operate if battery polarities are reversed. 10. Replace the battery end plate (15) by turning the large Phillips screw (16) clockwise with the Phillips screwdriver. Chadwick-Helmuth Company, Inc.

  • Page 157: Troubleshooting

    Troubleshooting 6.4 Troubleshooting In troubleshooting the Vibrex 2000 and Vibrex 2000 Plus, be aware that any problems generally fit into one or more of the following categories: • Operator error • Equipment failure • Aircraft problem • Interface problem This section gives you the following troubleshooting aids: •...
  • Page 158 It can also be caused by another component turning at or near the same rate as the component being measured, such as unbalanced tail rotor shaft that interferes with the tail rotor balance. Normally a spectrum examination will reveal this problem. Chadwick-Helmuth Company, Inc.

  • Page 159: Troubleshooting Guide

    To locate and/or order specific parts, see the diagram and table under Section 6.3.7 “Complete Unit Disassembly” on page 137. 6.4.2.1 Reference Table The following table provides a basic Vibrex 2000 and Vibrex 2000 Plus troubleshooting guide: Possible Cause Corrective Action...
  • Page 160 Incoming pickup Signal is out of Range. Ensure target tape “dwell” is long enough for installation parameters. If low speed RPM is OK but signal is lost as speed is increased, make tape wider in beam or photocell. Chadwick-Helmuth Company, Inc.
  • Page 161 EPROM chip for looseness, position, and/or damage. The main PCB may have to be removed for closer inspection. Keyboard ribbon Check the ribbon cable for looseness, position, cable loose or offset and/or damage. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 162 Battery voltage low Replace or recharge the batteries. Terminals in battery If the terminals on the battery end plate PCB end plate PCB are discolored or corroded, clean them with a corroded and/or dirty pencil eraser. Chadwick-Helmuth Company, Inc.
  • Page 163 Section 6.3.7.2 “Disassembly” on page 143). Inspect the unit for loose connectors, pinched and/or broken wires. Photocell probe Inspect the photocell. Replace it if necessary. failed and is causing a short circuit Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 164 Connector damaged Inspect connectors for damage and/or bent pins. Internal connections Remove the connector end plate (see loose or damaged Section 6.3.7.2 “Disassembly” on page 143). Inspect the unit for loose connectors, pinched and/or broken wires. Chadwick-Helmuth Company, Inc.
  • Page 165 Internal connections Remove the connector end plate (see loose and/or Section 6.3.7.2 “Disassembly” on page 143). damaged Inspect the unit for loose connectors, pinched and/or broken wires. Sensor failure Replace the sensor. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 166 No incoming RPM The Strobex flashes once when the user pulls its trigger. Check the incoming RPM transducers and the general setup. Damaged connector Inspect the nine-pin connector for damage. and/or bent pin Chadwick-Helmuth Company, Inc.
  • Page 167 If the user has extreme difficulty in acquiring a vibration reading, do one or more of the following actions: • First, try to acquire readings again. The Vibrex 2000 Plus has a feature that tightens the tolerance automatically on hard-to-acquire readings.
  • Page 168 Chapter 6 - Maintenance Chadwick-Helmuth Company, Inc.
  • Page 169 Appendix: Photocell Taping This appendix helps the user determine how much retro-reflective tape (tape width) to use with the Vibrex 2000 and Vibrex 2000 Plus systems’ photocell installations. Tape Width Determination The user may determine the optimum photocell tape width for the subject aircraft in the following ways: •...
  • Page 170 This means the distance of the tape from the center of rotation. b. Numbers refer to the Chadwick-Helmuth part number. No. 12803 is 1 in. wide, No. 10444 is 0.5 in. wide, and No. 3300 is 0.2 in wide.

  • Page 171: Working Example

    The user has placed the tape at 5 in. from the center of propeller rotation and is doing a propeller balance operation at 2400 RPM. Vibrex 2000 and Vibrex 2000 Plus User Guide...
  • Page 173 The alphabetized list in this “Glossary” includes definitions of terms the user needs to know and be familiar with in order to use the Vibrex 2000 and Vibrex 2000 Plus Digital Dynamic Balancer/Analyzer systems. Alpha-numeric Keypad data entry characters that can be either letters (alphabetical or alpha) or numbers (numeric).
  • Page 174 One Hertz (Hz) equals one cycle per second. Inches per second; a unit of measure for vibration velocity. In the context of the Vibrex 2000 and Vibrex 2000 Plus, IPS represents a velocity peak. A unit of physical measure; one mil equals 0.001 in.
  • Page 175 The cable that connects these devices is called an RS-232 cable. When the Vibrex 2000 or Vibrex 2000 Plus connects directly with a printer, this link is called a serial interface. Velocimeter A Chadwick-Helmuth accelerometer that integrates acceleration into velocity as its output (Model 7310 Velocimeter).
  • Page 176 Glossary Chadwick-Helmuth Company, Inc.
  • Page 177 Notes Vibrex 2000 User Guide...
  • Page 178 Notes Chadwick-Helmuth Company, Inc.
  • Page 179 Notes Vibrex 2000 User Guide...
  • Page 180 PRODUCT SUPPORT AND SERVICES S.A.R.L. VIBRATECH 93 allée du phœnix L’orée du parc 83600 Fréjus - France Tel : +33 (0)4 94 44 41 13 Fax : +33 (0)4 94 44 47 30 E.mail : contact@vibratech.fr WEB SITE: www.vibratech.fr Chadwick-Helmuth Company, Inc.

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