My

on this topic,
Personally I'd rather use my own tools because I know how they work, I know they wern't abused by someone and wont be given the excuse "It was working last time I used it" when I pick the tool up and see its off.
Tools should be calibrated by the person using them especially micrometers and smiliar tools, everyone uses a micrometer differently, on my Starrett Series 436 1-2" micrometer with a solid thimble I use it to measure and I get the right number using a standard or gage blocks, BUT I've got people I've let them use it complain it measures smaller by a couple of thou, and others who think its right on, so what happens to your calibration system when the tools are comming back from calibration measuring and they are all off because of the "human factor" ??
Also as for calibrating/checking them before use in my opinion from personal experiance and from observation of more experianced Toolmakers (Tool and Die makers, Mold makers, Machinists etc) is that tools need to be checked before use quickly with a standard (if needed like micrometers over 0-1" for example) and be self checked throughlly once a month or every couple of months to make sure they are running right without being required to do it in a organized mannor like alot of Quality systems require because the more experianced Toolmakers I know take pride in their work and want it to be right so they do it if its required or not.
A calibration system shouldn't be needed for the measuring tools on the shop floor because they should be checked by the user anyways at the start of use to make sure its right and not have a sticker on them assuming its right for its "calibration period", only for Quality checking tools should calibration be needed. Only thing I think that if a company felt they needed to make sure the Toolmakers tools are working right is to provide a calibrated gage block set to them to check their own tools and to calibrate specific standards like micrometer standards for the Toolmaker.
Thoughts ??
Dimitri