Question for the QuarterMaster...

(Hopefully somebody can pass this along)

How much pressure does it take to properly stamp a quarter?

I have access to a 1 ton arbor press and a steel stamp and it doesn't even mar the surface...

 

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Thumb pressure. You just apply the stamp and press.

 

Really? That's strange.

I counter stamped a quarter once with a good hit using a hammer. The letters P and R

 

Seems like a question for @dcarr, perhaps?

 

I'm a mechanical electrical engineer and by coincidence working on shear pressure to sever solid logs of plastic. I did a quick calculation and on a blank the size of a quarter you would need 80 tons of pressure. I can bore you with Brunel hardness and all types of engineering stuff but if you want to do this I can show you how and it will cost under a $1000 but you will never achieve mint production although you may end up in Jail !

 

If you just want a countermark though,about 30 tons will make a crisp impression
@Burton Strauss III

 

Isn't there a difference between striking pressure and tonnage. I can give and end result better with a strike from a hammer, than a vice.

 

I was going to ask about the surface area of the die making the countermark...

 

16mm x about 5mm - class two lines of about 5 chars each.

 

My avatar shows a counterstamp I used to apply to coins as conversation pieces...my calling card, if you will. I used a 5 pound sledge hammer and a homemade fixture to hold the coin in place. Nothing fancy for me.

Bruce