Belts & pulleys & advice please

[Robin Hewitt]

is there really a problem with going to BEEEG (12Nm) motors?

Just looked at one... Holding torque 12Nm, working torque about 8Nm which it can hold up to about 5 revs/sec before starting to fade.

That power was obtained with 6.2A of pure 110VAC which could be tricky to replicate.

Your real problem is that the hobby market has standardised on 2 phase 200 step/rev motors and now you can't buy anything else. It's good for a NEMA17 but not for a NEMA34, the inverse square law is against you.

Thinking that a monster motor will solve all your problems is a mistake, been there, done that. Fitting a smaller motor seems so counter intuitive nobody will believe it could possibly work.

If you want power maybe servo motors are the way to go, but I have no experience of them.