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South Adams Machine Trades. Rockwell Hardness Tester. Rockwell Hardness Tester Donated by: Micromatic, LLC Berne, Indiana. Rockwell Hardness Tester Main Parts. Dial. Penetrator. Weights. Anvil. Light Switch. Capstan Handwheel. Dial Setting Wheel. Trigger Lever. Crank Handle. - PowerPoint PPT Presentation
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South Adams Machine Trades
Rockwell Hardness Tester
Rockwell Hardness Tester
Donated by: Micromatic, LLC Berne, Indiana
Rockwell Hardness Tester
Main Parts
Crank Handle
Trigger Lever
Capstan Handwheel
Weights
Dial
Penetrator
Anvil
Light Switch
Dial Setting Wheel
Rockwell Hardness Tester
Penetrators
Rockwell Hardness Tester
Anvils
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
Hardness is the resistance to PenetrationWhat is happening when we use the hardness tester?
Rockwell Hardness Tester
Step 1
Verify Crank Handle is towards the operator
Use Capstan Handle to lower anvil to provide enough room to get the part you are testing
between the Anvil and Penetrator
Rockwell Hardness Tester
Step 2
Place part on AnvilNote: part must be clean
and flat to check accurately. Stone off part and remove
scale prior to testing
Be careful NOT to hit the
Penetrator with your part
Securely Support any long parts while testing
Rockwell Hardness
TesterStep 3
Applying the Minor Load
Use Capstan Handle to raise Anvil and Part
towards Penetrator. BE CAREFULL!! Move
slowly towards penetrator
Raise
Anvil
Lower
Anvil
Rockwell Hardness Tester
Step 4Applying the Minor Load
Slowly raise the Anvil until the Small Pointer is
on the Black Dot
Note: Small Pointer will be in the vertical position
Black Dot
Large Pointer will make
several revolutions
while setting Small Pointer
Rockwell Hardness Tester
Step 5Applying the Minor Load
Once the Small Pointer is on the Black Dot, the
Larger Pointer should be somewhat vertical.
Black Dot
DO NOT worry about stopping the Large Pointer exactly on the
“Zero”
!!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 Tester
Step 6Zero the Dial
Use Dial Setting Wheel to move the Dial so the “Zero” lines up
with the Large Pointer.
Rockwell Hardness Tester
Step 7Zero the Dial
Small Pointer should still be lined up with the Black Dot
Verify that the “Zero” is lined up with the Large
Pointer
Rockwell Hardness Tester
Step 8Applying the Major Load
Press Down on Trigger Lever
Crank Handle will automatically move away
from operator
Weights will automatically
drop
Rockwell Hardness Tester
Step 9Getting the
Reading
Rotate handle back towards operator
Once the Large Needle stops moving…..
Rockwell Hardness Tester
Step 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
Inner “Red” numbers are for Rockwell “B”
ScaleNotice the “B” above
each number
Rockwell Hardness Tester
Step 11Remove Part
Turn Capstan Handle Counterclockwise to lower
anvil to remove part
Always Protect Penetrator Point
Rockwell Hardness Tester
Step 12Turn Off Light Turn off Light
Switch when Complete
Round Part Hardness Compensation