Page 37 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

Round work should be supported in a hardened Vee anvil or in a cylindron anvil, which consists of two hardened
parallel cylinders. When testing small rounds, it is essential that the center of the Vee be aligned with the center
of the penetrator. The piece must be straight.
Irregularly shaped pieces must be properly supported on specially designed fixtures if an accurate test is to be
made.

Tubes and hollow pieces must be supported by a mandrel to ensure rigidity under the test loads. This will prevent
the tube from deforming under the major load, thus causing a lower hardness reading.

Gooseneck extension for ease of internal testing.
hardness test on sheet using diamond spot anvil.
Operation of Rockwell Testing Machine
1 Select the correct combination of weights (at the rear/side of the machine) and penetrators (diamond brale,
1/16-inch ball, etc.) for the hardness scale you wish to use. The numbers given in black represent the scales
that use brale and the numbers given in red represent the scales that use ball penetrators.
2 Make certain that the crank (4) is in forward position (nearest to you).
3 Place sample on the anvil.

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CITS : C G & M - Fitter - Exercise 61