Member postings for Peter Facey

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Thread: Understanding chuck test certificates

16/06/2022 11:52:13

I recently bought a brand new Pratt Burnerd chuck. I am having difficulty understanding its test certificate (see image).

I expected it might refer to internal and external jaws, but not "long vee" and "short vee" jaws. What do they mean?

I can understand the 30 micron runout figures for the diameter and face of the body. For the rest, on the left they seem to be using 4 diferent test bars with the LV jaws, so perhaps LV means internal jaws. It seems they are tightening the chuck onto each test bar three times, using the three pinions, and getting different results each time. I don't really see how these results fit with their claim "Super precision chucks have a repeatability of 0.03mm TIR guaranteed".

On the right we seem to be using rings 1 and 2. So perhaps under "SV jaws" they are testing the external jaws by expanding them onto test rings and measuring the face and diameter runout. Not sure what the "LV jaws" bit under "Rings" is.

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