I apologize in advance because I know this is a commonly discussed topic. I've done some searching and reading, some calculating and estimating and am hoping for some help with my specific setup.
To clarify the 'pulley' system, I have an eye hook and a hook in the forward post. The twine is attached to the eye hook, strung to the first s-hook, down to the hook, then up to the second s-hook and to the weight.
From my understanding, this would be a (estimated, not including the angles) 3:1 MA for the pulley system: 4 legs - 1 leg that weight is attached.
My lever forces are already calculated (more like estimated) at 25lb per 5psi. This calculation takes into account mold diameter.
So, If I am to press at a 'medium' force of 15psi, would it be correct as follows:
15psi = 5psi * 3 = 75lb(lever) = 75lb(lever)/3MA(pulley) = 25lb final weight.
I understand that the weight should be somewhat higher due to angles.
The mold is 4.625" diameter, so I'm using 16in^2.
Do I have this totally screwed up?
Thanks for any help.