Remember when we had to hand-scrape every part for flatness?

Had a big aluminum plate job, needed to be flat within 0.001. Old guy in the shop said to try a trick from the manual mill days. I put a thin film of layout dye on the surface plate, then gently rubbed the part on it. The high spots showed up bright blue. Took a stone and just kissed those spots, checked again. Did that three times and it was dead flat. Anyone still use that old spotting method for tricky finishes?

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2 Comments

luna5505mo ago

Is that really necessary for just one plate?

2

the_drew5mo ago

Honestly, what else would you do with it?

5