Related Manuals for Starrett SR200
Summary of Contents for Starrett SR200
- Page 1 Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com SR200 Surface Roughness Tester User Manual...
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Page 2: Table Of Contents
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Table Of Contents Chapter 1 Using the SR200 with a PC Introduction to Surface Texture Printing terminology and definitions To cancel print: Surface Texture Definitions Chapter 4 Menu Settings Parameter Definitions Main Menu Cut off... - Page 3 Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Specification for Data Dump Chapter 6 Accessories Chapter 7 Maintenance Calibration Reference Standard Sensitivity Check and Adjustment Cleaning the Stylus Pick-up Skid...
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Page 4: Introduction To Surface Texture
Introduction to Surface Texture terminology and definitions Surface Texture Definitions Every components surface has some form of texture which varies according to its structure and the way it has been manufactured. These surfaces can be broken down into three main categories: Surface roughness, Waviness and Form. In order to predict a components behaviour during use or to control the manufacturing process, it is necessary to quantify these surface characteristics. This is done by using surface texture parameters. Surface Texture Parameters: Can be separated into three basic types: Amplitude, Spacing and Hybrid. Amplitude Parameters: Measures of the vertical characteristics of the surface deviations. Spacing Parameters: Measures of the horizontal characteristics of the surface deviations. Hybrid Parameters: Combinations of spacing and amplitude parameters. Mean Line: Is a least squares line of nominal form fitted through the primary profile where the areas of the profile above and below this line are equal and kept to a minimum separation. Profile filters as detailed in ISO11562 define the mean lines for the roughness and waviness profiles. Cut-off: A cut-off length (or sampling length) is a filter that uses either electronic (2CR) or mathematical (Gaussian) means to remove or reduce unwanted data in order to look at wavelengths in the region of interest. Bandwidth: Is the ratio of the upper Cut-off (Lc) to the lower Cut-off (Ls). Sample Length: The profile is divided into sample lengths l, which are long enough to include a statistically reliable amount of data. For roughness and waviness analysis, the sample length is equal to the selected cut-off (lc) wavelength. The sample length is also known as the cut-off length. Evaluation Length: The length in the direction of the X axis used for assessing the profile under evaluation. The evaluation length may contain one or more sample lengths. For the primary profiles the evaluation length is equal to the sample length. 1.1 SR200 Specifications subject to change... -
Page 5: Parameter Definitions
Note: almost all parameters are defined over one sample length, however in practice more than one sample length is assessed (usually five) and the mean calculated. This provides a better statistical estimate of the parameters measured value. Parameter Definitions Surface texture is quantified by parameters which relate to certain characteristics of the texture. The SR200 offers the following parameters: Ra, Rp, Rsm, Rz, Rt, Rmr, RPc, Rz1max, Rsk, Rda Additional parameters can be analysed by downloading results to optional software. Ra: Universally recognised, and most used, international parameter of roughness. It is the arithmetic mean of the absolute departures of the roughness profile from the mean line. -
Page 6: Rsk
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Rmr: Material Ratio is the length of bearing surface (expressed as a percentage of the evaluation length ln) at a depth below the highest peak. Replaces tp% - Bearing Ratio as defined in ISO 4287 - 1984 RPc: Peak Count The number of local peaks which project through a selectable band centred about the mean line or a line parallel to it. The count is determined only over the evaluation length though the results are given in peaks per cm (or per inch) Known as Pc before 1997 Rsk: Skewness Rsk is a measure of the symmetry of the profile about the mean line. This parameter indicates whether the spikes on the surface are predominately negative or positive or if the profile has an even distribution of peaks and valleys. Rda: R Delta a or Rda or RDa - Arithmetical Mean Slope Arithmetical Mean Slope of the Profile within the Sampling Length. 1.3 SR200 Specifications subject to change... -
Page 7: Chapter 2 Description
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Chapter 2 Description The SR200 is a portable, self-contained instrument for the measurement of surface texture and is suitable for use in both the workshop and laboratory. Parameters available for surface texture evaluation are: Ra, Rz, Rt, Rp, Rmr, RPc, Rv, Rz1max, Rsk, Rda An explanation of the surface texture parameters evaluated by this instrument is given in Chapter 1. The parameter evaluations and other functions of the instrument are microprocessor based. The measurement results are displayed on an LCD screen and can be output to an optional printer or computer for further evaluation. The instrument is normally powered by an alkaline non-recharge-able battery. If preferred, an optional power adaptor can be used Figure 1 The Equipment The standard SR200 includes: • 1 Pickup cable • 1 Traverse unit • 1 Screwdriver •... -
Page 8: Traverse Unit
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Traverse Unit The top panel of the traverse unit carries a membrane type control panel and a liquid crystal display. The unit houses the electronics for controlling the measurement sequence, computing the mea- surement data and outputting the results to the display, or to the RS232 port for use with a printer (when included) or to a com- puter, for further analysis. The unit also contains a drive motor which traverses the pickup across the surface to be measured. The measuring stroke always starts from the extreme outward position. At the end of the measurement the pickup returns to this position ready for the next measurement. The traverse length is determined from selections of cut-off or length. Figure 2 Battery Pick-up Connector Select Key Display Battery Compartment RS232 Connector Measure key Scroll key Print key 2.2 SR200 Specifications subject to change... -
Page 9: Pick-Up Mounting Components
Figure 3: pick up mounting Insert Extension Pick-up rod here Clamp Drive Shaft Connector Adjustable Pick-up Support Mounting Bracket Pick-up Holder Mounting Bracket Clamp Screw Use this mounting position when the right angled pick-up is used SR200 Specifications subject to change... -
Page 10: Adjustable Support
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Figure 3a Figure 3b Adjustable Support: This can be clamped at any position on the slide of the mounting bracket to provide pick-up height adjustment. Pick-up holder: This fits into the crutch of the pick-up support and is held in place by a spring plunger. A biased holder, when used as shown in figure 3, exerts a biasing force on the pick-up (depending on which way the holder is inserted into the support crutch). It can also be used to position the pick-up directly underneath the display unit, as shown in figure 4. Figure 4 The holder will hold the pick-up at right angles to the drive shaft when it is pivoted away from the surface (eg while changing the work piece). Connector: The connector of the pick-up lead is screwed into the end of the pick-up and is then inserted into the end of the pick-up holder, with the lead coming out through the slot 2.4 SR200 Specifications subject to change... -
Page 11: Pick-Up
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com in the holder. It is advisable to connect the lead to the display-traverse unit first and then the pick-up. To connect the pick-up to the display-traverse unit: the pick-up has 2 threaded ends with location pins. Insert the location pin securely into the SR200 body and tighten the threaded collar. When the extension rod is used, the short pick-up lead is not required and the end of the rod itself is inserted into the holder. Pick-up: The pick-up is a variable inductive type transducer, which is supported on the surface to be measured by a skid, a curved support projecting from the underside of the pick- up in the vicinity of the stylus. As the pick-up traverses across the surface, movements of the stylus relative to the skid are detected and con-verted into a proportional electrical signal. The radius of curvature of the skid is much greater than the roughness spacing. This enables it to ride across the surface almost unaffected by the roughness, and provide a datum representing the general form of the surface. Even so, where the waviness is widely spaced it will be necessary to use the pick-up with shoe, in conjunction with the 2.5mm (0.1in) cut-off. Figure 5: the pickup is supported on the workpiece by the skid There are several different types of pickup available designed for different applications, details are given in the Accessories section of this handbook. They differ only in the stylus tip radius, the dimensions of the housing or position and the shape of the skid. The stylus material in all the pickups is diamond for low wear. The skids of the standard pickups are of red ruby. Figure 6. Standard pick-up dimensions... -
Page 12: Mounting
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Mounting: On a flat surface the display-traverse unit can be supported on its three feet. If a user wishes to make his own mounting bracket for the unit, the dimensions of the fixing holes are shown in figure 7. Figure 7 2.6 SR200 Specifications subject to change... -
Page 13: Chapter 3 Getting Started
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Chapter 3 Getting Started Battery To insert a battery, open the compartment by sliding the door to the right and remove the door from the unit. Insert the battery, with the terminals positioned as shown in the diagram on the floor of the battery compartment. Connecting the Pick-up Plug the lead into the socket on the front of the unit and mount the pick-up as follows: The connector of the pick-up lead is screwed into the end of the pick-up and is then inserted into the end of the pick-up holder, with the lead coming out through the slot in the holder. It is advisable to connect the lead to the display-traverse unit first and then the pick-up. To connect the pick-up to the dis-play-traverse unit: the pick-up has 2 threaded ends with location pins. Insert the location pin securely into the SR200 body and tighten the threaded collar. Rotate the pick-up to bring the stylus vertical; this can conveniently be done with reference to the identity number engraved at the end of the pick-up. Position the Pickup stylus on the component to be measured, with the stylus parallel to the component (see figure 8 below). Ensure that the stylus tip is in contact with the surface (this can be verified by checking that the identity number engraved at the end of the pick-up is vertical). The skid should also be in contact with the surface. Figure 8 SR200 Specifications subject to change... -
Page 14: Making A Measurement
Note 1: If the pickup has been changed or the instrument is being used for the first time, the instrument should be calibrated (see Chapter 7). Note 2: Successful use of the SR200 will only be possible if it is operated on a surface free from external vibration - see also operating notes in Chapter 5. -
Page 15: To Cancel A Measurement
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com If multiple parameters have been selected they may not fit on the display. To continue viewing the remaining results, click on the SELECT key. To cancel a measurement If Measure is pressed during a traverse, a stop and reversal without measurement will occur and Measurement Cancelled is displayed. Using the SR200 with a PC If the SR200 is connected to a PC then measurements will be taken in dump mode, which is selected using the SCROLL and SELECT keys from the main menu (see next chapter for full set-up details). Position the Pickup stylus on the component to be measured. Measurements are then activated from the software on the PC. When the measurement is completed the pickup returns and the results are dumped directly to the PC. During transfer of the measurement data the message Data Dumping is displayed. When the data dump is completed, the dump menu still remains active. From the displayed menu, values of evaluation length and range can be changed and further measurements for data dump can be made (see next chapter for further details). Printing PRINT key: pressing this key causes the evaluated measurement data to be output to the RS232 port. When a printer is connected, a printout of all the parameters selected in the print menu is made. If SPC has been selected (see chapter 4) the heading is disabled. Where the profile is longer than 80cm the printout will stop after 80cm. Pressing PRINT key can print the next 80cm. The printout will start from the beginning of the profile if SELECT is activated. If no legal surface data is stored, the error message “Measure before print” is displayed. To cancel print Pressing the PRINT key during printout (before display has updated to Main menu state) -
Page 16: Chapter 4 Menu Settings
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Chapter 4 Menu Settings The operation of the SR200 is based on making selections from menus presented on the liquid crystal display. Two menu states exist, these are: Main Menu and Data Dump Menu. The Data Dump menu is accessed via the Main Menu and is used when connecting to a PC. Main Menu The Main Menu (accessed by pressing the Scroll key) is used to make the following selections: CUT-OFF EVALUATION LENGTH PARAMETERS RANGE PRINT SETTINGS UNITS FILTER DUMP MODE The SCROLL key is used to cycle through these options and the SELECT key is used to confirm the set up screen required. For a chart of default settings see Chapter 3. Cut Off: To select the cut-off required, select the Cut-off option from the main menu. Press the SCROLL key to toggle through the cut-off options until the required cut-off is highlighted on the screen, then press the SELECT key. See chart in chapter 5 forfurther information. Evaluation Length. To select the evaluation length required, select this option from the main menu. Press the SCROLL key to toggle through the evaluation length options until the required length is highlighted on the screen, then press the SELECT key. The evaluation length options are determined by the cut-off length selected. Parameters: select the Parameters option from the main menu. A list of the parameters available will appear 4.1... - Page 17 SELECT key is also used to de-select a parameter. Ra Rz1max Rt Rmr > > > settings Rpc > > > settings Exit When selecting the Rmr and Rpc parameters, additional settings need to be specified. SCROLL onto “Settings” then click on the SELECT key. The following screen will appear: settings % + Offset Mean line + Offset Exit The SCROLL key will cycle through ‘Mr% + Offset’, ‘Mean line + Offset’ and ‘Exit’. The SELECT key will allow the alteration of one of the 2 settings or, if Exit is highlighted, will return to the main parameter selection screen. Pressing SCROLL will step the cursor (or highlighted character) through the 3 decimal digits of the percentage, then the sign and 3 decimal digits of the offset and then to OK. Pressing SELECT will change the sign/digit - keep pressing SELECT until the required figure is reached. Pressing SCROLL saves the change and moves the cursor along to the next decimal digit. When complete Select OK to return to the previous menu. Settings 001% Offset +00.0µm The following screen is displayed for Rpc settings and is amended in the same way as above. Bandwidth 00.0µm SR200 Specifications subject to change...
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Page 18: Range
0.1% 1 decimal point 1 decimal point 1 decimal point 0.001µm 0.001µm 0.001µm 0.1 deg 0.1 deg 0.1 deg 1.0µm 1.0µm 1.0µm Print Settings: Allows selection of print options. User can choose to print any combination of graph, parameters and header information. The scale of the graph can also be selected. SCROLL through and press the SELECT key for each item required - a tick will appear alongside the item. Units: Allows imperial or metric units to be selected. Filter: Allows filter options of either Gaussian or 2CR (see explanation in Chapter 1). Dump Mode: This menu mode is used if connecting the SR200 to a PC (see below) Dump Mode (Using your SR200 with a PC) If using the SR200 with a PC you will need to select the DUMP MODE option from the main menu. Scroll to Dump mode ON. Each time the SR200 is switched on, the following dump mode menu options will be available: 4.3 SR200 Specifications subject to change... -
Page 19: Spc Mode
Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com EVALUATION LENGTH RANGE UNITS FILTER DUMP MODE All other settings are carried out via the PC. SPC Mode If SPC is required, this can be switched on by pressing the PRINT and SCROLL key down simultaneously. The following warning screen will appear: Warning Changes to the following settings are for advanced functions only Quit Selecting OK displays the Select language and select SPC mode screen. Select the SPC Mode then SCROLL will toggle the mode between ON and OFF. When SELECT is pressed with OK selected the previous screen will be shown again. ModeON Language Settings The default on the SR200 is English Language. If the user wishes to select other languages, press the PRINT and SCROLL key down simultaneously. The following warning screen will appear: Warning Changes to the following settings are for advanced functions only Quit SR200 Specifications subject to change... - Page 20 Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Selecting OK displays the Select language and select SPC mode screen. Select Language Select SPCmode Quit SCROLL down the options and SELECT Select Language English Français Deutsch Italiano SCROLL down the list of languages with and SELECT . This selection will remain as the default unless power is lost (eg battery is removed). 4.5 SR200 Specifications subject to change...
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Page 21: Technical Considerations
5. W here the texture of a surface has a predominant direc tional character (LAY), it is usual to traverse across the lay, not along it. On a horizontal surface 1. Use the biased pick-up holder on the display-traverse unit 2. C lean the surface to be measured, so that it is free from abrasive material, grease, suds etc. This is necessary to ensure accurate readings and to reduce wear on the skid. 3. Make the cut-off/length and parameter selections required 4. P osition the display-traverse unit and pick-up so that the stylus contacts the surface and the pick-up is approximately parallel to the surface. Make sure that the length of surface is sufficient for measurement, remembering that the traverse motion is inwards towards the display-traverse unit. 5. P ress the Measure key. When the traverse is completed, the results are displayed and the pick-up returns to its extreme outward position. 6. If an error message is displayed, identify the cause, correct it and repeat the measurement. On other surfaces On a vertical surface:If necessary, hold the display-traverse unit by hand on the surface, making sure that it does not move during the measurement. In a small deep bore: Fit the optional extension rod between pickup and holder. SR200 Specifications subject to change... -
Page 22: Cut Off
0.8/4 >0.4 to 1.3 >10 to 50 >2 to 10 2.5 2.5/12.5 >1.3 to 4 >50 to 200 >10 to 80 8/40 Operating Error Indications During a measurement a message may be displayed which indicates that an error condition has occurred. The messages and the probable causes for their display are as follows: Display Reason for message Motor Error Motor fault Pick-up Error Response at pick-up level error or faulty connection Over range Selected range too small Can occur in front of a measured value due to excessive slew rate for a single data point (large spike). May also occur if the pick-up is lifted off the surface Printer connected at start of transmission but later detected as not Data transmit error connected (printer off line) When battery voltage <6.4V: key push operations are disabled and display is off. When the instrument is in the sleep mode and the MEASURE key Battery low is pressed, then “Battery low” is displayed for 2 seconds, followed by the normal display or operation. Stored surface profile is erased Renew or recharge battery 5.2 SR200 Specifications subject to change... -
Page 23: Specification
Traverse Speed 1mm/sec Measurement metric/inch units Cut-off values 0.25mm, 0.8mm and 2.5mm (0.01in, 0.03in and 0.1in) Traverse lengths 0.25-25mm (0.05-0.98in) Display LCD-matrix, 8 lines x 20 characters, alphanumeric 9 pin D-connector female. Containing RS232 hardwired handshake (RS232 level). Transmit function only hardware implemented. Remote start (5V logic) Accessory socket Remote start: short to ground. Constant power on instrument (5V logic) When connected to Ground, constant power is on RS232 Output Printer Configuration If SPC is on Baud rate 4800 Baud Parity Even Data bit length 7 bits Printer head disabled If SPC is off Baud rate 9600 Baud Parity Data bit length 8 bits Printer head enabled Output to printer (in ASCII characters) or pre-selected parameters and provided that G is pre- selected, a readout of dc corrected surface profile. SR200 Specifications subject to change... - Page 24 Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Language of printout same as language of display The printout heading is shown below: Starrett SR200 Operator:… Date: …… Object: …… Cutoff = xxx mm Evaluation length = xxx mm Filter = xxx 5.4 SR200 Specifications subject to change...
- Page 25 Rapp Industrial Sales 724 789-7853 sales@rappindustrialsales.com Specification for Data Dump The following format is used for data dump from SR200 to a PC. Transmission set up is as follows: Baud rate: 9600 Baud Number of data bits Start bit: Stop bit: Parity: None Resolution Horizontal Vertical 0.5µm for Evaluation 10nm Length 8mm 1.0µm for Evaluation Length >8mm 0.25mm, 0.8mm, 1.25mm, Evaluation length selectable 2.5mm, 4.00mm, 8.0mm, 12.5mm. 25.0mm Range selectable 10µm, 100µm, 300µm Transmission RS232...
- Page 26 Figure 10: The right angle pickup Right Angle Pick-up, 5µm (200µin) stylus tip radius (SR-112-1505) This pick-up is used at right angles to the direction of traverse. Accordingly the skid is set at right angles to its normal position. It is particular useful in grooves or slots where the lay of the surface texture makes it unsuitable for measurement with a standard or small bore pick-up. When used on cylindrical workpieces it is important that the stylus and skid should be equidistant from the crest (see figure 11), and that the work piece is positioned so that the crest is parallel to the line of traverse. Figure 11: Conditions to be observed when the right angle pick-up is used on a cylindrical work-piece 6.1 SR200 Specifications subject to change...
- Page 27 This pick-up has an extended stylus and skid for measuring at the bottom of a recess, or between shoulders and flanges up to 5.7mm deep. A special deep recess pick-up is available for measuring up to a depth of 25mm. Figure 12: The recess pickup Extension rod (SR-112/1510) 200mm long extension with integral lead, fits between the pick-up and carriage. The extension rod is fitted to the pick-up in the following manner: 1. D isconnect the pick-up lead from the traverse unit and remove the pick-up from the traverse unit carriage. 2. Remove the lead from the pick-up 3. C arefully locate the central pin of the extension rod with the hole in the pick-up and screw the rod and pick-up together. 4. T hread the lead from the extension rod through the hole provided in the back plate of the traverse unit and connect it to the traverse unit socket. 5. fit the pick-up into the traverse unit carriage, positioned as required. Power Adaptor SR-112-3530 Power Adaptor (UK) SR200 SR-112-3531 Power Adaptor (US-110V) SR200 SR-112-3532 Power Adaptor (EURO-230V)(2 PIN) SR200 SR200 Specifications subject to change...
- Page 28 The procedure for checking and adjusting the pick-up sensitivity is as follows: 1. P lace the reference specimen on a flat surface and set up the instrument to make a traverse across it. Make sure that the traverse unit body is parallel to the surface of the standard and that the stylus traverses at right angles to the lay of the grooves. 2. Select the 0.8mm or 0.03in cut-off and the Ra parameter. 3. Make a measurement of the reference specimen and compare the Ra value from the display with that marked on the specimen. 4. I f it differs by more than 2% use the small screwdriver to turn the sensitivity adjuster. This is located through the hole which is located in the front panel of the Display Unit, just above the pick-up connector. 5. R epeat the measurement and adjustment, until the measured value is within 2% of the value marked on the specimen. Cleaning the Stylus Occasionally clean the stylus with a camel hair brush moistened with a proprietary cleaning agent. Pick-up Skid To reduce the effect of wear, on pick-ups with a rotatable skid, occasionally turn the skid round to present a new contact surface. The skid is clamped by the screw in the front of the pick-up. When loosening this screw, take care not to let the retaining pin next to the skid fall out. When retightening the screw, ensure that the end cover is correctly positioned with respect o the stylus and that the stylus is free to move. 7.1 Form 965 - SR200 4/11 2.5C/T starrett.com...
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