First Y-axis Driving Test using by linear stepping motor.

by jspark, published

First Y-axis Driving Test using by linear stepping motor. by jspark Jun 20, 2013
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I did Y-axis moving test.
The results was not good.

The maximum speed was just about 55 mm/sec.
The linear stepping motor was stalled when it over 55 mm/sec.

The linear thread is not straight and it is directly affect to the z-direction accuracy on this type structure.
It makes z-direction waving of bed plate when it move.
I didn't know the possibility of the linear thread would be not straight.

Please refer following link movie.

The uploaded file is the y-end idler.
It was slightly modified for more good fit.
The original model was in the following link.

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Is this Y idler better overall, or because your threads were bent?

I think the most serious problem is the bending of the linear screw. And the work of fixing the bending is a time consuming work. Furthermore, because of the short lead length, high friction on the nut, so it was hard to make the speed over 100 mm/sec.

If the screw came straight, would this idler still work better?

Sure, there's no problem on this idler.

I know it's desirable to use as many printed part as possible, but an anti-backlash nylon nut would work best in this situation. You can reduce the noise on those quick moves by fiddling with the Jerk and acceleration settings in your firmware.

Is the threaded shaft part of the motor, or is there a coupling between them? If the shaft is integral to the motor assembly, I would not expect it to be out of round. Maybe it was damaged. Adding a flex coupling and bearing on the motor end might eliminate the Z problem, but you would likely lose some of your travel in the Y direction. Given the reduced size of the machine, I don't think that would be a good compromise.

Thanks for good comments wildeyed!
The motor and lead screw is not separated.
It was unthinkable that the lead screw would not straight too.
Could you let me know where can I get the anti-backlash nylon nut?
I hope it is not expensive.

I did wonder what the max speed would be, you'd either need to gear it up, or get something like a 30mm pitch leadscrew, to allow higher speeds, or use lower microstepping. (although by using any of these, your printer resolution would go down)

A leadscrew should be pretty straight. Maybe use two smooth rods, with the leadscrew in the middle, it would make it much stiffer, and the leadscrew wouldn't be able to have as much of an effect on where the bed sit, although this would probably load up your motor a bit more.

Thanks for good comment!

You are right, I have to use one more smooth load for stiffness as your comment.

But in case of the x-axis, there's no space to add one more smooth lod.
So I am sad..

I think I have to find to get the linear stepping motor which has more power, longer lead length and nice straightness of linear screw.

It might be a not easy work.