Large gantry style router, Do i need gearboxes?
03 Oct 2021 05:38 - 03 Oct 2021 05:49 #222072
by hairy
Large gantry style router, Do i need gearboxes? was created by hairy
Hi Folks!
I'm planning my first large gantry style router machine (table ~2x4.5m Z ~250mm ) , which would be used mainly for plasma cutting, but also for milling wood / aluminum and plastic.
On X and Y axis, I would like to use rack n pinion system and my question is that, if I use Nema 34 ~10Nm steppers is it possible drive these with direct drive, without gearbox? I would put smallest (diameter) heavy duty gears i can find. My concern is that is it going to be too fast? Does it still need reduction gearbox?
Second, if i can afford it, is the ball screw always better option on Z axis, or is there reason why I should select leadscrew on that? (less backlash etc? no need for braking?)
www.t2cnc.hu/downloads/Lichuan/2%20Phase...otor%20Datasheet.pdf
LC86H2128
Thanks, i appreciate your comments!
I'm planning my first large gantry style router machine (table ~2x4.5m Z ~250mm ) , which would be used mainly for plasma cutting, but also for milling wood / aluminum and plastic.
On X and Y axis, I would like to use rack n pinion system and my question is that, if I use Nema 34 ~10Nm steppers is it possible drive these with direct drive, without gearbox? I would put smallest (diameter) heavy duty gears i can find. My concern is that is it going to be too fast? Does it still need reduction gearbox?
Second, if i can afford it, is the ball screw always better option on Z axis, or is there reason why I should select leadscrew on that? (less backlash etc? no need for braking?)
www.t2cnc.hu/downloads/Lichuan/2%20Phase...otor%20Datasheet.pdf
LC86H2128
Thanks, i appreciate your comments!
Last edit: 03 Oct 2021 05:49 by hairy.
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03 Oct 2021 09:07 #222081
by tommylight
Replied by tommylight on topic Large gantry style router, Do i need gearboxes?
Plasma requires a light gantry while routers need a heavy and stiff one, so having both on one machine is never a good idea, but it can work for sure with some limitations.
With rack and pinion reductions are mandatory, not negotiable, the smallest pinion is something like 30mm in diameter so that results in over 100mm of move for one revolution of the motor hence the resolution goes out the window.
With rack and pinion reductions are mandatory, not negotiable, the smallest pinion is something like 30mm in diameter so that results in over 100mm of move for one revolution of the motor hence the resolution goes out the window.
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04 Oct 2021 03:38 #222163
by hairy
Replied by hairy on topic Large gantry style router, Do i need gearboxes?
Thanks for clear answers... I'm quite space constrained and that's why i was considering combo machine. I have to think about this little bit more...
Cheers!
Cheers!
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