HisSoldier
Member
- Joined
- Sep 26, 2007
- Messages
- 1,330
I bought ten of these on ebay, cheap. Said to be "gunsmith punches". The overall length is 3.140", the large diameter is 6MM, or .236". About .385" from the "striking" end there is a perpendicular hole drilled through of .099" dia.
That end also has a tiny center drill hole for live center. 1.815" from the striking end the diameter is reduced to .138", and is round in cross section for .400" at which point five flats are milled or (probably) ground around the pin every 72 degrees.
Those flats go nearly all the way to the business end, but about .060" from the end there are five corresponding facets that taper down at about a 20 degree angle. At the terminus is another center drilled hole, with a .050" diameter pilot.
The effect of the five 20 degree facets when they meet that center drilled end is a bit like points of a crown.
These are well made punches, or pins. If they had a rounded point on them I would think they were machine gun firing pins, but the end geometry could be for "crowding" an over sized or worn hole down to fit a pin, which is how clock repairmen fix that problem I understand. My gunsmith thought they were stippling punches. They look like gun parts to me, cosmolined and wrapped in tissue paper is how they came to me. I haven't checked the Rockwell yet.
Any ideas to end the mystery are appreciated. Thanks,
The end;
That end also has a tiny center drill hole for live center. 1.815" from the striking end the diameter is reduced to .138", and is round in cross section for .400" at which point five flats are milled or (probably) ground around the pin every 72 degrees.
Those flats go nearly all the way to the business end, but about .060" from the end there are five corresponding facets that taper down at about a 20 degree angle. At the terminus is another center drilled hole, with a .050" diameter pilot.
The effect of the five 20 degree facets when they meet that center drilled end is a bit like points of a crown.
These are well made punches, or pins. If they had a rounded point on them I would think they were machine gun firing pins, but the end geometry could be for "crowding" an over sized or worn hole down to fit a pin, which is how clock repairmen fix that problem I understand. My gunsmith thought they were stippling punches. They look like gun parts to me, cosmolined and wrapped in tissue paper is how they came to me. I haven't checked the Rockwell yet.
Any ideas to end the mystery are appreciated. Thanks,
The end;