Quote Originally Posted by A_Camera View Post
It's not too late yet to take a step up and use NEMA34, but I would prefer not to, because it would mean a huge change. It would also mean that it starts to become too large for my CNC, which means I might as well give up, which I don't want to do at this stage.
That would be an expensive mistake, large motors like Nema 34's require lots of voltage to spin fast and by lots I mean 150V+ to get any reasonable speed with torque.

The price of AC servos has come down to such a level that they nearly match High voltage drives which are required to get speed and torque from large steppers. So I would look at those before large steppers.

I have these 600w AC servos on my plasma machine and while only 1.9Nm they massively outperform the 4.5Nm closed-loop stepper motors. Which at just over $200 is a very good price, I would fit these and pay the extra over the JMC or any of those types of DC servo every time. (They also do them with a brake)

https://www.aliexpress.com/item/3304...5be81468ni78om

Like I said before if you are going to go this far then do it right the first time because while digging deep hurts I always find it works out cheaper than experimenting and far less hassle.