On 02/28/2019 05:04 PM, Frank Tkalcevic wrote:
I have a cheap ebay $100 probe. I had doubts about the accuracy, so I
perfomed a test probing a precision disc from all orientations. (The disc
came from a 1"-2" micrometer - it is used to "zero" the micrometer).
The results were pretty poor, with the error ranging from 0.3mm to 0.75mm.
http://www.franksworkshop.com.au/wordpress/2019/03/01/touch-probe-accuracy/#
results
I have no way to measure how good MY probe is.
Yes, what I need is a standard for an inside mike. That
would make it pretty easy to test several directions without
moving anything. I did set it up by creating a program to
measure two sides of a gauge block, and dialing in the
"fudge factor" in the program to compensate for the apparent
probe ball diameter. Since the Blum probe needs the ball
deflected a fair bit to register, the computed diameter of
the ball is quite different from the actual measured size of
the ball. But, it seems to work pretty well.
Jon
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