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265830 Don Schwartz <dks@t...> 2018‑05‑15 Re: How big is your try square?
On 2018-05-14 8:36 PM, Ed Minch wrote:
> Perhaps 10 years ago, Roy Underhill demonstrated how those spikey recesses
were made.  He clamped on a metal plate with a cutout shaped like that in it,
then he had a tool with cutters at the two ends of what looked like a flexible
tuning fork and it was spun with a bow drill and raced all around within the
metal plate and cut the recess.  It is called a Parser Drill:
> > h
> Mesmerizing to watch

It's the same process which was used to inlay 'shields' into the scales 
of pocket knives.

Interesting that it should be referred to as a drill. Clearly it's 
operating more like a modern pattern router. Of course, in the distant 
past they didn't have 20,000+ rpm tailed demons. Their only rotary tools 
were drills and braces.



“It is easier to fool people than to convince them they have been fooled.”

“The events of the world do not form an orderly queue like the English, they
crowd around chaotically like the Italians.” Carlo Rovelli

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