An hydraulic press has benefits, such as being able to press larger sheets and having controllable/repeatable pressure. But you can easily smoosh tobacco down to the density of MDF board.
Someone who can actually do math can correct mine, so:
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Per Jensen states (in a YT vid I can longer find) that the Mac Baren automated press is 40 tons, 40x40cm
40cm = 15.7”.
15.7x15.7=246 sq"
1 ton = 2000 pounds.
40 ton = 80,000#
80,000 pound ÷ 246 sq" = 325 psi
Multiply 325(psi) times the surface area of your mold (in sq. inches) to get the pressure needed to replicate the Mac Baren automated press.
So, for a 4"x4" mold (16 sq.”) you would need 5,200 PSI or (5,200 ÷ 2000) 2.6 tons
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Most home shop presses can far exceed this, so watch it or you'll end up with a pricey hockey puck.