Thank you for an excellent explanation of the errors on gauge blocks. My recent EBay find has a calibration certificate. It will be interesting to take a look and see by how much the blocks deviate. Please carry on making these ‘back to basics’ videos.
Takes a LONG time to wear the anvil on a newer micrometer, they routinely face them with tungsten carbide now, even the cheap Chinese ones, was much more of an issue when plain hardened tool steel was used.
The blocks can be, and are, oversized as well as undersized. It’s likely that 50% of the blocks will be oversized. The tolerances on my new blocks are pretty tight - my cheap metric ones (calibrated) are accurate to about 0.1 micro meters up to 50mm length. Easily good enough to calibrate my micrometers - a 4 to 1 accuracy margin is apparently enough for metrology labs
Cheers Alan i've always fancied some gauge blocks, you had a bargain there mate, can you do a drill sharpening video with your tool grinder please ? .... Regards Andy
