DPRG mailing list archives: [DPRG] Pittman GM8712 torque

Tue Sep 4 15:58:30 CDT 2001

If I remember correctly, the last time I looked for a motor from
Pitman, they had two basic gearbox torque ratings for the two gearbox
types.
The small one was 200 in/oz and the larger was 500.

Alan

--- "David P. Anderson" <dpa at io.isem.smu.edu> wrote:
> 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
> 
> -----------------------------------------------------
> 
>         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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> 
> 

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