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Summary of Contents for Starrett 3815
- Page 1 TWIN Rockwell Hardness Tester Model No. 3815 Operation Manual Technical Support Tel: (201)962-8352 Web Site: http://www.starrett.com Page 1...
- Page 2 Retain Instructions for future reference. Description The 3815 Hardness Tester accurately measures hardness of materials in standard Rockwell scales as well as Superficial Rockwell scales. Heat-treated steels are tested using a 120 diamond indenter. Soft/thin materials are tested using a 1/16" carbide ball indenter. This tester features a weight adjustment knob for quick and easy adjustments between different scales.
- Page 3 Operating Instructions & Parts Manual 1. Load/Unload Handle 2. Handwheel 3. Elevation Screw Cover 4. Anvil 5. Indenter 6. Screw for cover 7. Top cover 8. Screw for rear cover 9. Rear cover 10. Indicator 11. Rockwell “R”－Surface Rockwell “SR” conversion dial 12.
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Page 4: Basic Set-Up Information
Operating Instructions & Parts Manual General Safety Instructions 1. Never use clamps, straps, any other tooling or equipment to mount specimen to the tester anvil. 2. Always use the proper anvil supplied. 3. Be sure to use proper indenter and weight for material and hardness to be tested. (See Figure 3). Hardness Tester Should Be Maintained 1. - Page 5 Operating Instructions & Parts Manual 9) Remove back cover and begin to remove white string from all moving parts 10) Place weights on weight bar in order as shown below 11) Proceed to lower the main lead screw and remove the rubber block that is protecting the indentor housing 12) Clean and lubricate the lead screw using light duty spindle oil.
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Page 6: Operation
Operating Instructions & Parts Manual Operation: 1. Determine the proper indenter, scale and weight for the material hardness to be tested (see charts in back of manual) Mount the required indenter in the indenter holder using the set screw on the side of the holder. 2. -
Page 7: Fine Adjustment
Therefore it is suggested that the end user make slight adjustments to bring the machine back into the allowable tolerance. Please be sure to make very slight adjustments when calibrating the 3815 as this machine is extremely sensitive to any movement. -
Page 8: Maintenance
Operating Instructions & Parts Manual Maintenance 1. If large needle on the dial indicator rotates suddenly at first and then slows during a test, then the dash pot may be low on oil. To fill the dash pot, go to Page 5 in this manual and follow instructions. Bleed the air from the dash pot by manually raising and lowering the dash pot piston until all air bubbles have been released from under the piston. - Page 9 Operating Instructions & Parts Manual Rockwell C Hardness Range Approximate Hardness Conversion Numbers for Non-Austenitic Steels ( 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...
- Page 10 Operating Instructions & Parts Manual Rockwell B Hardness Range Approximate Hardness Conversion Numbers for Non-Austenitic Steels ( 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...
- Page 11 Operating Instructions & Parts Manual Approximate Leeb (Type D) Hardness Conversion for Non-Austenitic Steels (Rockwell C Hardness Range) A Leeb Hardness, Type D Rockwell C Hardness Vickers Hardness Brinell Hardness Impact Device (HLD) 150kgf (HRC) (HV 10) 10mm Steel Ball 3000kgf (HBS) (721) (699)
- Page 12 Operating Instructions & Parts Manual 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...
- Page 13 Operating Instructions & Parts Manual 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”...
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Page 14: Technical Support
Operating Instructions & Parts Manual 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 … … … … … …...
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