Topics created by flopes

@droftarts Thank you very much

@jay_s_uk thats awesome. impressive fast response. thank you

@flopes a DC motor controlled by a VFD would be a much better choice for a lathe. See https://docs.duet3d.com/en/User_manual/Machine_configuration/Configuration_CNC#connecting-a-spindle

The rest of that page will also be useful setting up the lathe in CNC mode.

Ian

@droftarts said in Cannot run CNC slower than 0.6mm/min:

I'm not sure, either, but the 'maximum time that a move is allowed to take is about 30 minutes" came from @dc42, so probably need his input on that one. I guess segmentation would make it okay?

Correct. Implementing segmentation automatically for long-duration moves is already on my list.

@flopes There is the STM B_G431B_ESC board, which works with hardware-encoder for medium power BLDC motors.
It can be flashed with simpleFOC, which allows you to control the motor via step/dir interface by gcode directly or UART messages (for constant speed or torque use cases)

@flopes There are CNC-pendants, which also work with Duet boards, but AFAIK they're digital. Or at least they have a digital interface to the Duet...

//edit check here for a new analog variant

@jay_s_uk Thank you very much

@dc42 Hello. The Beta 3.5.0 with segments of 0.02 is sufficient for my aplication at the moment.
We build this custom laser printer cut brain implants and the programs are quite long - 10's of thousands arcs connected together. Usually takes 3 days to cut one batch. During these last 6 motnhs we come up with a series of methods to minimize the offset in position from the first features cut to the last ones. We figured out there is no more mechanical possibilities for this offset to be happening. We even added temperature control on the whole printer.

I believe there may be some rounding going on in the system. We also notice this offset is larger on y axis.0002.png

Do you believe we could benefit from adding encoders to the Nema17 stepper motors?
by the way we use 1600steps/mm
Thanks