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16-09-2010 #11
there is nothing intrinisically wrong with long lead screws as long as they are correctly supported in tension by appropriate supports and of sufficient diameter. Making them larger pitch reduces the revs needed which also alleviate whipping. The issue then becomes one of inertia; a long, thick screw has high inertia needing lots of torque to accelerate it, but again that can be offset by a larger pitch...
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