I am tapping using an 0-80 Roll thread tap in a Brother TC-R2B with synchronous rigid tapping. I am working on a very small medical component where I have a part with a C-Bore .060 dp +/- .0005, and a drilled thru hole for an 0-80 Roll Tap. Parts are fixtured one at a time. We did a repeatability test on the fixtures and parts and the C-Bore depths repeat within .0002
My problem is the rotational start position of the thread in my work piece is varying more than expected. I need the start of my thread to be in the same rotational position relative to the bottom of the C-Bore within 10 deg for all parts. when I cut a precision section thru the finished part (thru the axis of the thread) and measure the major dia pitch location of each thread I find their locations from part to part vary from the C-Bore by up to .005. This indicates the thread rotational starting point is varying or the Z height of the tap is varying.

Any ideas or help is greatly appreciated

Tom Malinski




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