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10-16-2013, 11:22 AM #1
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- Oct 2013
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Why two motors for Z axis on Mendel?
I am interested in design decisions. My instinct would have been to use on motor for the Z axis and use a belt drive to drive the other. Someone pls make me wiser.
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10-16-2013, 01:02 PM #2
I'm no expert but I'd imagine it's a balance issue since the Z relates to the X carriage which has a big honking motor on one side of it. So I would imagine it'll be easier to move the Z up and down using two motors+threaded rods than just one motor that has to drive a belt as well.
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10-16-2013, 11:06 PM #3
Also. if you only use one motor, you would have to drive the dual z lead screws using 2 pulleys and a belt, which pretty much adds up to the cost of the motor you just replaced... In the end, it's easier to just use two motors for the Prusa Mendel design.
Eric
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10-29-2013, 12:38 PM #4
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- Oct 2013
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On the other hand, the Vellaman K8200 lifts the z-axis on one side only. Of course it isn't lifting the weight of the x-axis, since it has a horizontal xy table.
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11-05-2013, 12:18 PM #5
The reason for this is mostly simplicity, and as before mentioned, a stepper motor is circa the same price as the belt , two pulleys and one idler would cost, also you would need a seamless belt because of the multiple rotations one would need to lift the z axis.
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