Posts made by Pit96

@jay_s_uk This is of course also possible. However, as I believe that the weight of the Z-axis with spindle motor is primarily responsible for the lost steps, I rule this out for the time being with a counterweight. Then I will consider whether the motor dimensions are at all practicable.
Here is a photo of the CAD model to give you an idea. Yesterday I made the first chips in Styropr with the real milling machine.

Ok guys, thanks a lot, I got it.
Then my next steps will be

• Attach a counterweight/preload spring for the Z-axis
• Max out the stepper size for the TMC2209
• Install a gearbox if necessary

Hi @gloomyandy,
I was also afraid that it would mess up the feedback loop. I know that for AWD setups there is the possibility to assign two drivers for one axle. So at least the output signal should be identical?

Hey,

since there are many posts about how to control several motors with one driver, I am toying with the idea of whether it would also be possible the other way round. I realise that this question cannot arise if the control system is dimensioned correctly. In my case, however, I am trying to use the components I already have as much as possible.
I'm currently building a small desktop CNC mill that I'm running with a leftover Duet 3 Mini 5+. As the motor for the Z-axis is unfortunately a bit too weak, I would like to upgrade it.

Now to my question: As I only operate 3 axes, two stepper drivers would still be free. Can I run two drivers in parallel to operate one motor with a higher rated current, e.g. a Nema 23 with 3.6A?
I know that this is certainly not ideal. However, considering the circumstances, it would be an efficient use of resources.

Many thanks in advance!