South Adams Machine Trades

1. South Adams Machine Trades Rockwell Hardness Tester

2. Rockwell Hardness TesterDonated by: Micromatic, LLC Berne, Indiana

3. Rockwell Hardness TesterMain Parts Dial Penetrator Weights Anvil Light Switch Capstan Handwheel Dial Setting Wheel Trigger Lever Crank Handle

4. Rockwell Hardness TesterPenetrators

5. Rockwell Hardness TesterAnvils

6. Preparation for Hardness Testing • Part must be clean and flat • Stone off any burrs • If surface is extremely rough, use Belt Sander to smooth • Part must be at least 10 times thicker than the estimated depth the penetrator will go • Example, if the Penetrator will go .015 deep, the part must be at least .15 thick • Do not check close to the edge of the part • Part size must be at least 2-2.5 times wider than the penetrator indention diameter

7. Hardness is the resistance to PenetrationWhat is happening when we use the hardness tester?

8. Rockwell Hardness TesterStep 1 Use Capstan Handle to lower anvil to provide enough room to get the part you are testing between the Anvil and Penetrator Verify Crank Handle is towards the operator

9. Rockwell Hardness TesterStep 2 Be careful NOT to hit the Penetrator with your part Securely Support any long parts while testing Place part on Anvil Note: part must be clean and flat to check accurately. Stone off part and remove scale prior to testing

10. Rockwell Hardness TesterStep 3Applying the Minor Load Raise Anvil Lower Anvil Use Capstan Handle to raise Anvil and Part towards Penetrator. BE CAREFULL!! Move slowly towards penetrator

11. Rockwell Hardness TesterStep 4Applying the Minor Load Large Pointer will make several revolutions while setting Small Pointer Black Dot Slowly raise the Anvil until the Small Pointer is on the Black Dot Note: Small Pointer will be in the vertical position

12. !!WARNING!! If you go past “ZERO” do not back up! If you do back up you have to start over in a new location Rockwell Hardness TesterStep 5Applying the Minor Load Black Dot DO NOT worry about stopping the Large Pointer exactly on the “Zero” Once the Small Pointer is on the Black Dot, the Larger Pointer should be somewhat vertical.

13. Rockwell Hardness TesterStep 6Zero the Dial Use Dial Setting Wheel to move the Dial so the “Zero” lines up with the Large Pointer.

14. Verify that the “Zero” is lined up with the Large Pointer Rockwell Hardness TesterStep 7Zero the Dial Small Pointer should still be lined up with the Black Dot

15. Rockwell Hardness TesterStep 8Applying the Major Load Weights will automatically drop Crank Handle will automatically move away from operator Press Down on Trigger Lever

16. Rockwell Hardness TesterStep 9Getting the Reading Once the Large Needle stops moving….. Rotate handle back towards operator

17. Inner “Red” numbers are for Rockwell “B” Scale Notice the “B” above each number Rockwell Hardness TesterStep 10Getting the Reading Material Hardness: 51Rc (51 Rockwell “C” Scale) Use outer Black Numbers for the Rockwell “C” Scale Notice The “C” above each number

18. Rockwell Hardness TesterStep 11Remove Part Always Protect Penetrator Point Turn Capstan Handle Counterclockwise to lower anvil to remove part

19. Rockwell Hardness TesterStep 12Turn Off Light Turn off Light Switch when Complete

20. Round Part Hardness Compensation