How much force is needed?

[maverick323]

How much force is needed to die strike a silver coin? 

I saw a custom hammered die set up made for a 1.25 coin.

I asked about having one made for a coin 1.75 inches but, was told I would need around 160 tons of force to get a good image rendering. 

That seems like a lot considering it is only a 1/2 inch difference.

A machinist told me it can be done with much less. Maybe around 30 tons.

[AriArid]

Looks like it also depends on the size of the coin. Quick googling returns this:

https://www.usmint.gov/learn/production-process/coin-production

Quote

Circulating coin presses use from 35 to 100 metric tons of pressure to strike the coins, depending on the denomination. Other presses strike with up to 540 tons of force, the pressure used to create the America the Beautiful Five Ounce Silver Coins

 

[maverick323]

49 minutes ago, AriArid said:

Looks like it also depends on the size of the coin. Quick googling returns this:

https://www.usmint.gov/learn/production-process/coin-production

 

I saw that but, I figured that did not really apply as currency coins sandwich different metals together so, they need more force and a 5 oz silver coin is huge.

Edited April 26, 2023 by maverick323

[AriArid]

Well, if you’re thinking about making coins yourself, just order a die and then run some tests on different machines.

I’m thinking about my own custom made coins, that’s exactly the way I’m gonna do it

[Thelonerangershorse]

17 hours ago, maverick323 said:

How much force is needed to die strike a silver coin? 

I saw a custom hammered die set up made for a 1.25 coin.

I asked about having one made for a coin 1.75 inches but, was told I would need around 160 tons of force to get a good image rendering. 

That seems like a lot considering it is only a 1/2 inch difference.

A machinist told me it can be done with much less. Maybe around 30 tons.

Quite possible, it's an area thing so the pressure required will go up by a squared term not linear.

I.E. if you double the diameter of the coin the force required goes up 4x not just double.

[AriArid]

This guy mentions something about 90-100 tons, check it out: