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---In STMFC@..., <lnnrr152@...> wrote :
Bill, perhaps watchmakers use the terms differently but as a machinist, reamers and broaches work differently.
Both modify the size or shape of a hole but a reamer cuts with a rotary action. A broach is pushed or pulled
through a hole cutting in a linear fashion.
At least this is true of all that I have used. I now expect someone to come up with the exception.
I'd be surprised to hear of an exception because the way you have described the difference is exactly
the way I have heard and understood the issues all my life as well.
Cordially, Don Valentine