Have I got the maths right?

[Gary]

Its a mistake, this has come up many times.
It will be 3.5Nm.
What motor are you reffering to?
It is unlikely they will remove the link, i dont think there is anyone there who knows how :)

I didn't actually point to the page because graphs seem to be secret and I don't want them to remove it. I've now printed out the bit I wanted, page 26, so here it is...

http://www.motioncontrolproducts.com...pperMotors.pdf

2:1 down on 2.5mm screws means you need 8 rps out of the motor to get a lowly 1 cm/s on the G00.

If you wanted 1" per second do you still have the torque to avoid lost steps?
Pig in a poke without the graph, but I think I am stuck with the "suck it and see" approach because the information simply isn't there

[Gary]

Also those curves are very old and were done with drivers that are not available and at quite high voltages, so i would not advise you to use the curves as a firm axample of the performance you will get.
What torque do you need and what speed?

[Robin Hewitt]

What torque do you need and what speed?

1.3558Nm at 762 rpm would be nice, especially if I could do it at 40 volts

[Gary]

The SY60 is border line with 70V, and the nuxt motor up from that is the ST85STH65-2808.
I have attached the datasheet, but to get this torque curve that is on the datasheet you will need higher voltage.
The problem is that with the larger motors, you need the volts to get the speed.

1.3558Nm at 762 rpm would be nice, especially if I could do it at 40 volts