Re: [CAD_CAM_EDM_DRO] Stepper motor from Sherline?

Randy,

Looks like a nice motor. The motor has a holding torque of 110 oz/in
and speeds as fast as .5 inches per second can be achieved. Ramping must
be used to achieve the higher step rates. A 24 volt, 2 amp current
limiting chopper design is ample to drive it.

I saw the motors run on Sherline's rotary table at the P.R.I.M.E. show.
No worries!

I've been looking at this motor site, you can find an equivalent motor
and compare it:

http://www.mendonet.com/steppers/nema23.htm

Nema 23 High Performance "Step-Syn" H Series Bi-Polar Stepper Motors.
I'd say it compares to: 232-117-DB, 117 oz/in, 2A, 1.6V, $86. (AND 2,3&
4-motor discounts!) Sounds like a good price. Although I was looking at
the 180 oz/in motors for my next purchase.

Dan (Camtronics) has a motor (new, not surplus):
23-032 8 lead, 126 oz/in, 1.36A $85

http://www.seanet.com/~dmauch/
Alan

PS, I was SURE someone would reply there, NOW I bet you get lottsa
replies!



Randy Gordon-Gilmore wrote:

>
> I posted this on the Sherline group without response, so on the chance
> there are any Sherline CNC'ers over here that aren't over there, I'll
> repeat it here:
>
> Has anyone used the stepper motor Sherline sells? (I wasn't even aware of
> it until last week--they seem to have added it to the price list without
> fanfare...)
>
> I called and asked about specs, and from what the guy said I tracked it
> down to a Shinano Kenshi SST57D3201. Data sheet is at
>
> http://www.shinano.com/pdf/SST57D.pdf
>
> It is a 2-amp size 23 motor, double 1/4" shaft, 134 oz-in holding torque
> and about 95 oz-in pull-in torque. On paper, it looks like a really nice
> motor.
>
> The Sherline listing is
>
> 67130 STEPPER MOTOR, 2-amp, 23 Frame, 100 oz-in stall torque $48.00
>
> That seems to be about surplus price for a motor of this spec, from the
> ones I can find.
>
> BTW, when people talk about a "100 oz-in" motor, are they speaking holding
> or stall torque? I can rarely find data sheets for stepper motors listed
> on the surplus pages (like
> http://members.home.net/genea/StepperAndServoMotors.html )
>
> Best regards,
>
> Randy