Re: Re: Brushless Servo

Ian Wright wrote:

> For instance, the small steppers out of 5.25" floppy drives
> are square as are those out of the plotter I mentioned and
> some I have out of printers and photocopiers are short and
> squat. I assume all this means is that there is no universal
> way of determining by visual inspection whether any given
> stepper in a piece of old kit will be worth salvaging or not.

NEMA standards are applicable for industrial applications where
manufacturers are sourcing components for larger assemblies, such as CNC
machines. Disk drives are in another category. Here economics (volume),
size constraints, and other factors dictate
motors optimized to the application. Still, I would assume there are
standards here as well, just not as widely known as NEMA.
I bought a cartesian coordinate robot (the basis for my gantry mill) and
was quite surprised to discover I could not bolt NEMA steppers in place
of the Tamagawa servos.
There used to be a web page for someone that sold new stepper motors at
a decent price. He mentioned this metric standard and had the
dimensions. It's close, so be aware that not all motors that appear to
be NEMA size, in fact are.

Jon