My machine is running and works. A solid shakeoko style frame.

General CNC CNC Routers
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My machine is running and works. A solid shakeoko style frame. But electronics I used what I had lying around. Nema 17s and uno with Grbl Cnc shield with drv8825 for x y and a stepstick for z. I wanted to check if it would run ok and it does with the dremmel I have mounted on there for now.

But it needs more I’m going to put in a 700w makita spindle which seems a popular choice.

The z will stay nema17 honestly I don’t see a need for more power via the M8 threaded rod. I will drive it via a probably a drv8825 but my question is related to sizing the nema23’s and drivers for the x y axis. They are belt driven.

Readily available are 1 and 3 mm holding motors and the 0,5nm 17 seems to do an ok job now is 1nm nema 23’s enough. There’s a big price difference (with good reason) between them.

Then the drivers. I’ve always wired 2 motors on 1 driver ( this is on my 3D printers for z so very little movement) 2 motors on y however is a different story. Do I wire them on 1 higher amp driver or will 2 drivers be Accurate enough to keep in sync. If so will 2x 1nm motors be ok on a 4,2amp driver.

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Typically what I have seen with mills is one driver motor and tell the software which drivers/pins do what.

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When I ran a dual drive design I used separate drivers for each motor. Parallel loads usually don’t draw equal current from the same source. Typically what is done then is load balancing resistors are added to a circuit. But I don’t think that is appropriate with stepper motor driving.

Anything worth doing, is worth doing right.