[modeleng] Re: coarse threads

A lot of modern rifling is swaged with a hardened "button" that is pulled 
through the barrel. I think some is also rotary swaged from the outside onto 
a spiral mandrel, but maybe not.  I dunno, maybe I am just blowing wind 
about the external swaging.  Duh!

Unka Jesse the REDNECK in Tennessee

 Here's how modern CNC does it in a nutshell.

 rotary table (with rifling cam blank chucked in rot table and between
 centres) mounted under mill spindle
 cam blank  rotated by rotary table while table moves in X
 cutter cuts spiral groove in cam to whatever rifling twist is programmed

 Cheers Jeff Dayman

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