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Summary of Contents for Starrett 3823
- Page 1 Model No. 3823 Digital TWIN Rockwell Hardness Tester Instruction Manual TECHNICAL SUPPORT: (201) 962-8352 Web Site: http://www.starrett.com...
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Page 2: Table Of Contents
Contents table General description…………………………………………………………... Scope of application………………………………………………………….. Product features………………………………………………………………. Key performance parameters………………………………………………. Basic configuration and structure…………………………………………. Standard configuration………………………………………………………. Structure schematic diagram……………………………………………….. Installation and adjustment…………………………………………………. Operating methods…………………………………………………………… Testing preparation…………………………………………………………… Test parameters setting……………………………………………………… 5.2.1 Scale selection………………………………………………………………… 5.2.2 Load dwell setting…………………………………………………………….. 5.2.3 Auxiliary functions……………………………………………………………. 5.2.4 Communication status setting………………………………………………... -
Page 3: General Description
Loaded with features such as ultra-precise measurements, wide measuring range, automatic main test force loading/unloading, digitally displayed results, automatic printing, RS232/USB output, etc. the 3823 is suitable for testing hardness on carbon steel, alloy steel, cast iron, non ferrous metal and engineering plastics. -
Page 4: Basic Configuration And Structure
3 Basic configuration and structure 3.1 Standard configuration Base machine Test Blocks: Certified 1. One each, HRB 90’s 2. One each, HRC 20’s 3. One each, HRC 40’s 4. One each, HRC 60’s 5. One each, HR30N 6. One each, HR30T Carbide ball indenter (1/16″) Rockwell C 120°cone diamond indenter Mounting screws for indenter... -
Page 5: Installation And Adjustment
Included Indentors: Rockwell B Indentor Rockwell C Indentor 1/16” Carbide Ball Diamond 4 Installation and adjustment Remove top cover of wood crate, then remove the three M10 screws from the underside of the base. Lift the machine very carefully from the bottom. Do not lift from the head, the side doors or other points any time. - Page 6 Figure 4.1 Use adjustable feet to level the machine. Be sure to lock nuts when completed Optional Cabinet/Support Stand...
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Page 7: Operating Methods
5 Operating methods 5.1 Testing preparation Connect power supply and turn machine on. The 900-384 will perform a self check and relative information such as type, serial number of the tester, software version will be displayed on screen. Tester will come to main menu after self-checking; current (last used) test parameters will be displayed on screen. -
Page 8: Load Dwell Setting
Figure 5.2.1 Figure 5.2.2 The selection of test force is automatically adjusted once you select your hardness scale. There are three test forces of 60kgf(588.4N), 100kgf(980.7N) and 150kgf(1471N) for Rockwell hardness measurement, and also three test forces of 15kgf(147.1N), 30kgf(294.2N) and 45kgf(441.3N) for Rockwell superficial hardness measurement. -
Page 9: Auxiliary Functions
5.2.3Auxiliary functions The tester has four auxiliary functions, which can be used individually, multi selected or all selected. Press “ ” or “ ” key to move cursor to “3” in figure 5.2.1, press “ ” key ,then the cursor move to the position of “ ”and change to “... - Page 10 Normally, the serial number will increase 1 after each measurement until the n is equal to N (i.e. all of the N measurements were completed), then begin with statistical calculation. In event of an erroneous result, press “ ”or“ ”key in the figure 5.2.7 when the “√”...
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Page 11: Communication Status Setting
5.2.3.4 Curved surface correcting The testing results should be corrected if the surface of sample measured is the external surface of cylindrical or spherical part. Press “ ”or“ ” key to select cylindrical surface or spherical surface, then press “ ”... -
Page 12: Mode Selection Of Rockwell Or Rockwell Superficial
5.2.5 Mode selection of Rockwell or Rockwell Superficial The tester is capable of two modes of measuring; Rockwell measuring and Rockwell superficial measuring. Press “ ”or“ ”key to move cursor to “5” in figure 5.2.1, then press “ ” key, the cursor move to “Rockwell”. -
Page 13: Testing
5.3 Testing 5.3.1 Test preparation Place the sample to be tested on the anvil and rotate the hand wheel clockwise to lift the anvil as figure 5.3.1, showing the anvil moving course. Rotate the hand wheel smoothly until the anvil in figure reaches the end position as figure 5.3.2. Immediately stop rotating once buzzer sounds. -
Page 14: Automatic Testing
6 Maintenance and attentions 6.1 When transporting the hardness tester, the indenter should be removed, and a shockproof rubber pad must be put between the indenter “nose” and the anvil. If it is to be transported for a long distance, the original packaging should be used. 6.2 When changing the indenter, pay close attention to ensure the tip is not damaged and contaminated with oils, dust, dirt, etc., and the mounting surface should be clean without any oil, dust, dirt, etc. - Page 15 Approximate Hardness Conversion Numbers for Non-Austenitic Steels Rockwell C Hardness Range Rockwell Superficial Rockwell Number Brinell Hardness Number Rockwell C Vickers 10-mm 10-mm Knoop 15-N 30-N 45-N Scleroscope 150kgf (HV) Standard Carbide 500-gf Scale Scale Scale Scale Scale Hardness (HRC) ball ball 60 kgf...
- Page 16 Approximate Hardness Conversion Numbers for Non-Austenitic Steels Rockwell B Hardness Range Rockwell Superficial Rockwell Number Rockwell B Vickers 10-mm Knoop F Scale 15-T Scale 30-T Scale 45-T Scale 100kgf (HV) Standard 500-gf Scale 60kgf 15-kgf 30-kgf 45-kgf (HRB) ball 60 kgf (HRF) (HR15T) (HR30T)
- Page 17 Weight - Load - Indentor Chart Scale Indentor Type Preliminary Total Typical Applications Symbol Force Force (kgf) (kgf) Spheroconical 98.07 (10) 588.4 (60) Cemented carbides, thin steel, and shallow case hardened steel Diamond 1/16” Carbide Ball 98.07 (10) 980.7 (100) Copper alloys, soft steels, aluminum alloys, malleable iron, etc.
- Page 18 Round Correction Factors Corrections to be added to test results in the following scales for various diameter parts. Corrections to be added to Rockwell C, A and D values Diameter of Convex Cylindrical Surfaces Hardness ¼” 3/8” ½” 5/8” ¾” 7/8”...
- Page 19 Minimum Thickness Requirements Minimum allowable thickness for a corresponding hardness in the respective scales Minimum Minimum Rockwell Rockwell Rockwell Superficial Superficial Superficial Superficial Superficial Superficial Thickness Thickness Inch 0.006 0.15 … … … … … … … … … 0.008 0.20 …...
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