Universal Digital Rockwell Indicator (new)

Rockwell Hardness Testing

The Rockwell hardness test is a hardness measurement based on the net increase in depth of an impression as a load is applied. Hardness values are commonly given in the A, B, C, D and E scales. The higher the value in each of the scales, the harder the material.

Hardness has been variously defined as resistance to local penetration, scratching, machining, war or abrasion. In the Rockwell method of hardness testing, the depth of penetration of an indenter under certain arbitrary test conditions is determined. The indenter may either be a steel ball of some specified diameter or a spherical diamond-tipped cone of 120 deg angle and 0.2 mm tip radius, called Brale. The type of indenter and the test load determine the hardness scale (A,B,C,etc.)

A minor load of 3 kg or 10 kg is first applied, causing an initial penetration and holds the indenter in place. Then, the dial is set to zero and the major load is applied. Upon removal of the manor load, the depth reading is taken while the minor load is still on. The hardness number may then be read directly fro the scale.

 

MENU BUTTON
Opens and closes menu system

ZERO BUTTON
To reset

OK BUTTON
Confirms your menu selection

SCALE BUTTON
To select the required Rockwell scale

UP BUTTON
Moving up through the menu

DOWN BUTTON
Moving down through the menu

ON/OFF BUTTON
to switch the unit ON or OFF