Re: Geometric Self Opening Die Heads

"Bob La Londe"  wrote in message news:v712fq$8a9m$2@dont-email.me...
On 7/14/2024 4:04 AM, Jim Wilkins wrote:

"Bob La Londe"  wrote in message news:v6uh55$3mnvk$1@dont-email.me...

Geometric Self Opening Die Heads
...
How affordable where the thread jaws? ...

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https://www.travers.com/category/chasers
https://www.wttool.com/516-d-regular-high-speed-chasers

Ah... the cost of the "chasers" is really what I was wondering about.
Thanks.  I probably wouldn't buy a new die head at this point, but it
would be nice to have a couple sets of dies "chasers" if I decide its
worth the trouble to integrate into a process.
It looks like they are just referenced by slot size.  I wonder how
interchangeable they are.
--
Bob La Londe
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"Chasers" were originally hand-held chisels with multiple teeth filed into the end, used to clean up initially filed or hand guided single point threads cut on lathes that had chisel tool rests like a modern wood lathe.
I have an antique die stock that pressure forms male threads between V grooves in a floating row of die blocks with straight thread profiles on the walls, no cutting edges. The thread forms could have been cut into the die blocks by a shaper or planer. The sizes appear to be 18, 16 and 14TPI.
Looking at older ways to form screw threads shows why we had advanced little beyond the Romans until the thread cutting lathe became available around 1800. With it the improvements came very quickly, steam powered travel almost immediately and autos, aircraft and radio in a century.
https://mb.nawcc.org/threads/inch-screws-sizes-in-english-clocks.175136/