Hi All,

I have a knee mill with a Centroid M400 control. I'm having an odd issue...I can do a rev/in adjustment and get the measurement perfect for any given distance, but the measurements will distort at different distances.

I'll explain.

I followed the directions in TSB 36 from the centroid website on a 3" gauge block. I then remeasured it and the distance measured was 3.0005". Sounds good.

So then I measure a 2" and 1" gauge block and the distances came out to 1.9986 and .9974 respectively.

So what's happening? If the Revs/in is good at 3", shouldn't it also be good at 1"?

I guess it could be missing a couple of thousandths every time it starts its movement, of maybe accidentally adding it, I don't know.