Originally Posted by
Dan Burkhart
My Mitutoyo caliper is very accurate, but I recently purchased a cheapo one to incorporate into a cable pull measuring device. Says right on it, accurate to within +/- .2mm. That's a lot of variance when measuring seat posts.
Now that you mention it, mine say accurate to within 0.2mm also.
- But I can't fathom how one seat post measures 0.2 small and the other 0.2 large, when their nominal diameters are 26.0 and 26.8 respectively -
How can I reconcile a spread of 0.4mm when there is just 0.8mm difference between the nominal diameters ?
I am beginning to think that these things should not be measured with calipers at all. I know if I was machining seat posts I would at least have certified cylindrical ring gages to check go/no-go on them.
Q - Have you tested the accuracy - or shall I say, ability to measure posts with accuracy, using your Mitutoyo calipers?