Hi Mike,
the most powerful 23 size from Clearpath is in the HP series CPM-SDHP-2341S-ELN, 165 oz.in but to get it they
had to drop the rpm back to 1680 rpm and up the price to $631.00
At slow speeds steppers produce a lot of torque, better, considerably better than a servo of the same size. At high speeds
the servo comes into its own but that won't matter a damn if the servo can't accelerate fast enuf to stay within its
following window and it fault out.
If you're really keen on servos you will probably need to go up to 34 size units.
The cheaper alternative is low inductance, high torque steppers with a decent high voltage drive, 68V or better.
On the basis of my previous post I would recommend a continuous torque of at least half my steppers/gearbox,ie
350 oz.in
Keep looking, keep talking, keep comparing, all of these are free, its too bloody late when you've just dropped a grand on the
wrong thing!
Craig