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Line 78: − With the diamond penetrator, read Column C on the barrel dial (black numbers).+ − With the ball penetrator, read column B (red numbers).+
Rockwell Hardness Tester (view source)
Revision as of 20:09, 23 January 2018
, 20:09, 23 January 2018→Major Components
File:Rockwell_Major_Load_Lever.JPG|Major Load Lever
File:Rockwell_Major_Load_Lever.JPG|Major Load Lever
File:Rockwell_Dial.JPG|Dial
File:Rockwell_Dial.JPG|Dial
File:Cold_Metals_Tan_Cabinet.JPG|Tan Cabinet
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The indentors and hardness test blocks and spare anvils are in the tan cabinet, fifth drawer down.
=== Indentor / Penitrator Choice ===
=== Indentor / Penitrator Choice ===
=== Procedure ===
=== Procedure ===
1. Select the penetrator and test block
1. Select the penetrator/indentor.
Soft materials are usually tested in the Rockwell B Scale, using 1/16″ ball penetrator and 100 Kg Major Load. Hardened steel and hard alloys are tested in the Rockwell C Scale, using a diamond penetrator and a 150 Kg Major Load. Do not use the ball penetrator with the steel test block or when testing hard steel. Such a procedure will damage the penetrator and result in invalid tests
Soft materials are usually tested in the Rockwell B Scale, using 1/16″ ball penetrator and 100 Kg Major Load. Hardened steel and hard alloys are tested in the Rockwell C Scale, using a diamond penetrator and a 150 Kg Major Load. Do not use the ball penetrator with the steel test block or when testing hard steel. Such a procedure will damage the penetrator and result in invalid tests
2. Set up the tester
2. Set up the tester
Secure the penetrator and the appropriate anvil in the tester.
Secure the penetrator/indentor and the appropriate anvil in the tester.
Select correct weight, 150kg for C scale 100 kg for B scale. Three weights are stacked in the tester, the bottom is 60kg, next is 40kg then 50kg. With all three weights the total is 150kg, for the C scale. Remove the top weight and you have 100 kg for the B scale.
3. Apply Minor Load
3. Apply Minor Load
Slowly turn the hand wheel to bring the small dial indicator hand to the line. This applies minor pressure load to the penetrator.
Slowly turn the hand wheel to bring the small dial indicator hand to the line. This applies a minor pressure load to the penetrator.
4. Apply Major Load
4. Apply Major Load
6. Take the reading
6. Take the reading
With the diamond penetrator, read Column C on the barrel dial (black numbers).
With the ball penetrator, read column B (red numbers).
NOTE: The first two or three tests may be low until the penetrator and anvil have become firmly seated.
NOTE: The first two or three tests may be low until the penetrator and anvil have become firmly seated.