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.
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
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.
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
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.
Sweet , i just got my first set of gauge blocks. Thanks for sharing.
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
Nice tip for the lapping of the anvils. Thanks :)
Hi Adam a worn anvil is one thing that people don't check.
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.
Nice find
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
Hi Andy I will have to investigate drill sharpening I know Hemingway do an attachment for drills.
I'm half sold on one ..... just the drill thing now to get my full attention lol