Rockwell Hardness Tester: Difference between revisions
From Pumping Station One
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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 | |||
</gallery> | </gallery> | ||
The indentors and hardness test blocks and spare anvils are in the tan cabinet. | The indentors and hardness test blocks and spare anvils are in the tan cabinet, fifth drawer down. | ||
=== Indentor / Penitrator Choice === | === Indentor / Penitrator Choice === | ||
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=== Procedure === | === Procedure === | ||
1. Select the penetrator/indentor | 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 | ||
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Secure the penetrator/indentor 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. | 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 | ||
