Regards DIYCNC then personally I'd say no because he doesn't do any drives powerfull enough for what you'll need to get best performance.
My advice would be buy individual drives and pay the little extra and get 80V drives with 60-65v PSU this will give you the best performance for the 3nm motors your going to need to drive this machine.!
Last edited by JAZZCNC; 26-04-2012 at 09:55 PM.
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My machine is done this way and it completly eliminates some potential issue's that come with slaving motors together. I have used both methods and by far prefer this method.
It's not pritty and slightly more work intially but the peace of mind your not running out of sync and that if one motor stall and the other keeps going the machine not going to try and destroy it's self is well worth the trouble.
The cost is not much less due to belts/pulleys and has you say bigger motor and drive but again there's plus's in that it's less electrical components to intigrate and go wrong plus less Inputs/outputs required so more spare for other things like Probes, etc.
The other BIG differance comes when you you tune the motors.? When slaving motors you effectively have to leave a large safety margin regards motor tuning and velocity/accelleration than when using a single motor.
By the very nature of how steppers work and the fact they lose torque has RPM's rise then the chance of a stall increase's massively and on dualscrew setup stalling at high feeds can be devastating to the machine and your heart plus wallet.!! . . . . With single motor you can push the edge without fear of killing the machine or your self.
Jonathan - if you are still keeping an eye on this thread - I have seen on other threads that you have successfully developed a rotating ballnut system. I was wondering if fixed ball screws held in tension along my x axis would make sense here as it would eliminate whip? Do you sell your spinning ball nut mounts?! :) presumably the arrangement shown in the previous post could be used to drive two ball nuts mounted on the y axis gantry?
Does anyone have any pictures of a good twin x-axis (fixed) ball screw mill?
Sorry for the late reply...
I do sell the rotating ballnut mounts, 1500mm is about the threshold where I would say it's worth considering a rotating ballnut, fixed screw setup. You'd certainly get a higher feedrate, but the question is do you actually need it? If you're mainly cutting wood/plastics then you can certainly take advantage of higher feedrates, but if the machine is mainly cutting aluminium then the difference in overall machining time is extremely slight.
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