208OZ.IN stepper motor

[Robin Hewitt]

That would be an F1 Ferrari plasma cutter then? :naughty:

Let's make it work hard, 1" travel per stepper rev, massive 20kg gantry.

If I've got the maths right, 3Nm would do nought to 83 mph in one second.

I know you need some degree of overkill to compensate for the losses, but a smaller, faster revving motor would seem to be a better bet.

[JAZZCNC]

Like John S says more info required.!! All that John asked plus gantry weight or material/design plus type of linear bearings used.
Robins reasoning is sound enough but really without the full picture then can't be answered accurately.

Personaly I know of a 8x4 plasma that use's 3Nm motors geared 2:1 without any issue's but that use's R&P which hisn't the most efficient, also use's some crappy home made linear bearings.!!