In article , Artemia Salina
says...

How does one go about testing the flatness and trueness
of v-ways (for example, those on the cross slide of a
lathe) during the scraping process? I can't imagine
being able to get at the surfaces with a straight edge
like on bed ways.

If you read connelly you find that dovetail surfaces
basically need a master gage to scrape to. That's
part of the fun, getting the angle gage.

You first scrape one surface to be accurate, using
the gage to get the angle correct. Of course at the
same time you have to maintain parallelism and so on
between the two sides.

Then you use the one scraped dovetail part as a
gage, to do the mating surface.

Jim

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