Hi I wanted to discuss the different contact point geometries used when calibrating gage blocks by direct comparison to a master set on a comparator gage.
Back in the ancient times (like 100 years ago) I believe it was a simple platen and a single contact point from above method.
These days I notice most comparators use two balls which contact the block from above and below . What is the reason for this shift? Is the differential setup there to eliminate possible errors due to the platen not being perfectly flat or is it done to eliminate the need to produce lapped platen of sufficient quality? Or is it some Hertzian contact deformation cancellation due to using two probes?
submitted by /u/Bzdziuchanson
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