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Del wrote:
"I have a large
acme screw and a 14" dia. thick wall plastic pipe I salvaged that I am thinking
of making into a screw press for smaller batches, or for grapes. Figure I'll
just drill a jillion holes in the pipe."
Hi Del,
I've been considering a screw type press as
well. Roton sell the screws. The problem is so much mechanical
advantage is lost in the inefficiency of a screw. Acme threads rate
at about 30% efficiency. And that's assuming a good thrust bearing.
Without a thrust bearing on the end of the screw, more mechanical advantage will
be lost. Hydraulic rams are nearly 100% efficient. I'm still
considering a screw, but I'm just not sure if it will deliver enough
power. In short, a typical acme 1 1/4" screw will only
deliver about 4 ton of force, and that's with a thrust bearing, if 100 ft/lbs.
of torque is applied to the screw.
Mark
KS
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