I was looking at the press in
which is a screw press with four screws at the corners of a square block.
Thought, I have got all the bits I need to build one of those, except the bits to turn the screws. Then thought, how do I turn the screws?
I guess they must turn together, but would they be locked together to keep the plates parallel?
Eg, a single gear turns four gears at the ends of the shafts. Problem then is, the force on the single gear is kinda large, and the four gears have to be quite large and thus expensive too, and for geometric reasons you can't use a small central gear to get a large turns ratio (the four gears would interfere with each other).
Any other thoughts on how to turn the screws?
-- Peter Fairbrother