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I wonder if someone can help me with a calculation/estimation?

I have recently built a skateboard press to...press skateboards!

My question is, how do I calculate how much pressure is being applied to the skateboard?

Most presses are steel, however, not having any metal working skills I have made one out of wood.

General advice to press one deck, is applying 2 - 4 tonnes of pressure for x hours

I am using 2 x two tonne bottle jacks and a scissor jack, but as the pressure applied increases the wood starts to give.

Is there a very crude calculation or estimation which can be derived from this - the deck is sitting between the two molds?

Thanks!