Force To Mint A Quarter

Not sure if this will be of any help but here are a couple of excerpt statements I was able to find doing a Google search for "coin minting pressures needed"

"Blanks next proceed to the stamping or coining press. The blank is held in place by a ring, or collar, as it is struck under tremendous pressure. Pennies require about 40 tons of pressure, and the larger coins require proportionately more."


"Single-striking presses generally stamp 400 coins per minute, with pressure loads up to 180 tons. Multiple presses can crank out 120 coins per minute under 250 tons of pressure."

I am not sure of the specific force used for quarters but I do know that the US Mint uses Schuler presses.
http://www.schuler.de/en/index.html