Cnc breakout board for 4 axis milling machine.

dc42

Those stepper drivers need step and direction signals with a minimum signal level of 5V. As we don't yet have a Duet 3 board that supports external drivers, the best solution we can currently offer is Duet 2 WiFi or Duet 2 Ethernet, plus the Expansion Breakout Board.

We're planning a Duet 3 main board to support external drivers, but it probably won't be available this year.

bigdave

@dc42
Is the duet 3 capable of driving the motors directly?

jay_s_uk

@bigdave not the ones you've linked to

bigdave

@jay_s_uk
I still have to install Ballscrews an mount my motors so I might try to wait it out

A Former User

@bigdave said in Cnc breakout board for 4 axis milling machine.:

Is the duet 3 capable of driving the motors directly?

Duet3 6HC is rated for 4.45A RMS (6A peak) and the motors are 6A, so you'd not make full use of the motors, but unless the low resistance pr coils is a problem it ought be possible to drive them at 4.45A.

jay_s_uk

Except they have closed loop feedback which couldn't be used, which IMO would be a bit of a waste

A Former User

@jay_s_uk said in Cnc breakout board for 4 axis milling machine.:

closed loop

d'oh! yes!

mikedahlgren

@dc42 Looking forward to doing something similar, is there any update on the Duet 3 with external drivers might be available? Or should I buy a Duet 3 mini with 3 1XD's?

dc42

I'm sorry, we don't yet have an update on when Duet 3 with external driver support on the main board will be available. We are aware that a number of users are waiting for this.

The Duet 3 Mini can in theory support two external drivers using a breakout expansion board (as well as further external drivers using the 1XD expansion board).

tenaja

@bigdave
How is your project coming?

I'm surprised you are using ball screws and a control without backlash compensation. Do you just need fast, without concern for precision? Is there something else drawing you to duet?

If duet had backlash comp, I'd put it on one (or more) of my desktop machines, but without it, I'm sticking with the existing LinuxCNC. I suppose one could use a Marlin or Beagle board, but I haven't used either yet, so I don't have a favorite or a reason to migrate. (Like standardization.)