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Re:Hand Scraping a Truly Flat Plane (1908) [pdf] by paypalcust83 on Thursday April 16, 2020 @02:49PM (#22892265)
It's interesting to get more precise and accurate machines out of the ones came before.

These days, if you want to get milling and grinding down to 1 micron without lapping using only your own expertise and some parts from eBay (air bearings and precision-ground slabs):

https://youtu.be/sFrVdoOhu1Q

The creator (Dan Gelbart) demonstrates nitrogen-tight parts without bearings, and claims zero wear or lubrication needs.

#AvEclub

Re:Hand Scraping a Truly Flat Plane (1908) [pdf] by jbay on Friday April 17, 2020 @02:24AM (#22896718)
It wasn't nearly so easy. Dan hand-scraped in several surfaces on the lathe; for example the headstock, to get the axis parallel to the ways, and so on.