On Wed, 28 Jan 2015 22:58:41 -0600, Terry Coombs wrote:

Got any stepper motors for cheep? I think nema 34's will work , I want
to power the X axis and maybe the Y on my benchtop mill . I have (or
have components to build) controllers and power supplies , can fabricate
mounts and the rest in house . I actually had an 18v HF drill motor all
but mounted , using a PWM controller and a 13.5 volt supply . At the
speeds I need it didn't have enough torque - though I may revisit that
setup now that I can cut gears .
And speaking of cutting gears , how about cutting pulleys for cogged
belts
, anybody got experience doing that that they'd like to share ?

Having worked with stepper motors in space- and power-constrained devices,
I am highly prejudiced against them. That doesn't mean they won't work --
it just means that I've had bad experiences. I much prefer a servo motor
driven by a feedback loop (at least, when I get to design the controller).

Check with Herbach & Rademan (http://www.herbach.com) for motors. They
may not have what you want, but they have lots of stuff in that sort of
size.

For pulleys and belts and whatnot, check Stock Drive products. They
aren't a surplus place, but they have fair to middlin' prices on fair to
middlin' stuff, and they'll have the same thing next year. I've had good
success tossing together mechanisms using their parts.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com