[Dave W]

Originally Posted by mlh

A pair of digital calibers are not accurate enough to measure a bearing diameter. Calibers are only good enough for a few thousands. You need to be measuring in the tenths of a thousand. Bearings are made to a tolerance of a very few tens of a thousand.
In my machine shop we use top brand calibers $200 and over to measure to about .003 inch. This is pretty much industry standard. Calibers will not measure what you need to measure.
Lynwood

Digital or dial are probably good enough to measure a mass produced Dexter spindle but their repeatability sucks for low end tools. My old fashioned $$ verier scaled will repeat within <.001 with a set of 1-2" mics being even better.