Quote Originally Posted by Rich View Post
So after further research I found this website:

http://www.orientalmotor.com/support/motor-sizing.html

The numbers offer a guide to the amount of torque required to move at specific feedrates.

The issue now is what will the available torque curve will actually look like. I am unable to get hold of the torque curve for the motors I have in mind ( This is fine, as the torque curve is stepper specific ... so I have read.
Can I say after reading your initial first post outlining the simple usage of router style machine that your going far too deep into what will in practice make very little difference to how simple router works.

Don't get me wrong there's nothing wrong with learning about the technical side of things but honestly in practice for this type of machine there's not much to decide on the stepper side other than size and drive selection.

In practice what will Make or Break the machine will be YOU and YOUR skills and ATTENTION to DETAIL in how you build the machine rather than if the motor speed curve is optimum.!! . . . Poor build quality can make a perfectly suitable sized motor/drive /psu setup perform like bag of nails.

With typical stepper systems in basicly boils down to if you run on 50Vdc drives or 80Vdc drives. With voltages around 36/44Vdc and 60/70vdc respectively.
If 50Vdc then lower sized <2nm steppers are often used and on smaller size machines.
If 80Vdc then >2nm steppers are used and on Medium to large-ish(4x4) size machines.

Personally I mostly use 3nm motors running at 68Vdc with Digital drives on any size machine larger than A3 upto 4x4 as the money differance between smaller setup is nothing and the performance of this combination covers a large range.
For those with little engineering skills or tools they also offer a safety net to account for less than ideal build and will transfer to the inevitable next build.!!

It's really not rocket science regards steppers and doesn't need to be turned into it for straight forward router style machine. IMO DON'T try to re-invent the wheel just go with a setup what's proven to work.