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Ran some more math on my triple beam "L" gantry. With a little less simplification. Generally don't see any major problem. I think it is time to add the final details to the design and then start building the thing.
Using Fusion 360 now and its static FEA solver. Not sure I will stick with this although the integration with industrial design capabilities looks pretty cool.
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John C
Fwiw..
My large cnc mill bed is 240 kg in mass, for the bed alone, and up to 100 kg of vice and workpiece, easily.
So 340 kg++ of mass.
Worked fine with one small nema 23 stepper of 3Nm.
48V, 2M542 drive.
1:3 HTD belt drives.
Heavy is better, not worse.
For non-commercial use the speed was never a concern.
I never needed higher speeds.
Always wanted more mass, more rigidity, more resolution ...
leading to better accuracy.
hanermo2, I have some 2.8 Nm NEMA 23 low inductance steppers and some 60 volt PS and drivers so I will try that with this rig. Will mount the steppers off belts rather than the direct drive I previously planned. Sigh, back to the CAD.
John C
My previous machine ran off something similar to that spec with 5mm screws (you mentioned these in an earlier post) and it was direct drive. All worked fine.Quote:
Originally Posted by jcarpenter
But if you want better speeds for wood then belt drive allows 1:2, also reduces resonance effects in the stepper and most important of all(!) allows the motor to be tucked away.