Re: Struck Coin Blanks ???

On 11/28/2024 5:17 AM, Jim Wilkins wrote:

"Peter Fairbrother"  wrote in message news:vi96p6$em69$1@dont-email.me...
...
Ouch, At those prices it would be cheaper to use real money...
 Peter Fairbrother
-------------------------------
 I wonder if the stamping operation would adequately flatten blanks cut with a Greenlee punch, guided to not need the center screw. They cut a larger blank with less force than flat-faced punches. The points could be rounded as much as the press allows to reduce distortion.
 One company shop had a bench press that located and clamped the lower die between four horizontal setscrews. The punch fit into a round hole in the ram, the square-sided die had two beveled edges for the setscrews. At first it was difficult for me to align but it was very versatile and could punch the square and D shapes needed in electronics.
 The punch had a slight taper above the parallel section which would hold the die centered while I adjusted the setscrews. If I had to convert an arbor press that might be an easy way to fixture a die that could be hardened and then surface ground. The Lindsay book on making punches and dies suggests making and hardening the punch first, then using it to finish the die before hardening it.
 

I do have both hydraulic (import) and manual (Greenlee) slug busters.  I had not thought of using them as a punch and die or as a die for another punch.  Its not at all a bad idea.  The advantage to purpose built is it can be made so the slug drops free.  A pair of pliers is often required to remove the slug from a slug buster.
--
Bob La Londe
CNC Molds N Stuff
--
This email has been checked for viruses by AVG antivirus software.
www.avg.com