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HomeOur ProductsSpecialized and Custom Test SystemsSpecial Hardness Testers
Special Hardness Testers

United has delivered a special hardness tester to the University of New South Wales in Sydney, Australia.

This machine is capable of conducting a variety of hardness tests. It uses Rockwell, Vickers or Knoop indenters and features programmable forces. Interchangeable load cells allow operation from a few grams to 500 Kg. A larger frame could expand the capability to 3000 Kg for Brinell testing. The tester is equipped with an X-Y motion system to allow automatic specimen motion with repeatability +/- 0.5 micron.

This hardness tester has no elevating screw. The head is moved by a two-column ball screw system derived from the United SSTM 1000 lbf universal testing machine load frame. The frame is symmetrical to avoid the bending effect seen with "C" shaped frames.

Depth of penetration is measured directly by a Heidenhain Metro gage. The depth gage is suspended from a separate set of columns and "extra" crosshead.

The tester is equipped with a microscope and TV camera (see above picture) with variable magnification from 100 to 400 times. This mechanism allows the operator to visually select a position for the test. The system will then move the specimen so that the selected spot is directly under the indenter. After the test, the specimen is moved back to the original position so the operator can view the test impression. A video frame-grabber board allows the PC to take a "snapshot" of the test and save it with the force and depth data.