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2.8 Types of tests
The runtime depends on the purpose of the test, i.e. whether it is a long-time test or a
short-time test (weld test).
When the balls weld together, an electronic automatism will switch off the machine if the
load corresponds to the weld limit.
Chapter 3 below outlines the types of tests and processes happening during a test.
3. Test Description
3.1 Types of tests
3.1.1 What to do prior to each test
Always mount a fresh set of test balls and fill in fresh lubricant prior to any test.
Before you place the 3 balls into the ball cup, insert the ball into the ball holder and the
ball holder into the spindle, any residues must be removed from the parts, in particular the
ball cup with clamping ring and the ball holder.
Afterwards lightly grease the thread of the ball cup to prevent it from getting stuck when
you tighten the clamping nut.
Warning:
If you do not clean the parts mentioned above, residual abrasion particles may cause
the test result to be inaccurate.
To create constant conditions for later comparison ensure that you always test the lubricant
at the same temperature and that the ball cup itself is never too hot. We recommend you
work with two ball cups that you can use alternately in the tests.
Before you start a test series, run the four-ball tester in idle mode for 10 minutes to ensure
that the spindle bearing has the required operating temperature.
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