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Subject: [DPRG] Pittman GM8712 torque
From: David P. Anderson dpa at io.isem.smu.edu
Date: Tue Sep 4 15:17:15 CDT 2001

Howdy

Steve wrote:

> I remember seeing a spec-sheet on those Pittman motors at the last
> RBL. Do the specs indicate a number for torque? (Hopefully
> in oz/in)

Eric dug up the following from the Pittman web site.

regards,
dpa

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        http://www.pittmannet.com/122100.html

The spec sheet says of the 19.1V GM8712 gearmotor, with a 60.5:1
reducing gearbox:

    Gearmotor Data:

        Gearbox Efficiency              66%
        No-load Speed                   128 RPM

    Motor Data:

        Continuous Torque (Max)         1.3 oz-in
        Peak Torque (Stall)             5.1 oz-in
        No-load Speed                   7729 RPM

    Winding Data:

        Torque Constant                 3.06 oz-in/A
        Resistance                      10.80 Ohms
        No-load Current                 0.14 A
        Peak Current (Stall)            1.76 A


I take all that to mean (in theory) out the gearbox shaft:

        Continuous Torque (Max)

            1.3 oz-in  *  60.5:1  *  66%  =  51.9 oz-in

        Peak Torque (Stall)

            5.1 oz-in  *  60.5:1  *  66%  =  203.6 oz-in

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