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Duel Lead Screws
Hi All,
I'm in the process of designing my first CNC router table. The design that I'm thinking of will require a gantry span of 5'. I figure that my light-weight gantry design will not be stiff enough to be driven by just a lead screw on one side. I thought of placing a crossbeam underneath the table connecting the two legs of the gantry. However, I've decided not to go in that direction. Instead, I'd like to have a lead screw on each leg. Has anyone driven a single axis using two lead screws before? If so, how did you drive the screws (two motors)?
Thanks,
bb99
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shopbot uses 2 motors on the x - axis. and rack and pinion istead of lead screws.
a friend of mine has one.
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You could go with two screws, one motor, two pulleys and a belt.
Eric
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Greate ideas! This will give me lots to think about.
--bb99
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BB99,
I run a twin steppers on X with one controller, its a low cost K179 driver.
screws on left and right side and works real good. You have to get the
steppers wired right. I could email you the wiring.
As a matter of fact if I turn stepper 1 by hand with power off, it will make stepper 2
turn...acts a brushless DC motor. With power on they are in perfect sync and push my heavy router and carriage with no troubles. I just increased the volts to the stepper controller + wire to make up for the extra current draw.
Best of luck!
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high this link doesn't work anymore can someone post the correct one? thanks.... Bob
http://www.cnczone.com/showthread.php?s=&threadid=1355