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[DPRG] Re: Pittman motors at Tanner's

Subject: [DPRG] Re: Pittman motors at Tanner's
From: Rodent daweasel at swbell.net
Date: Mon Aug 13 23:45:12 CDT 2001

My big robot weighs about 10 lbs,  has 12-volt 44 rpm motors and 4" diameter
wheels -- it has plenty of power. It was severely underpowered when I had
the 100 rpm motors. I would be affraid the Pittman motors may be turning a
bit fast to have any power, especially with a 5" wheel.

----- Original Message -----

> These little Pittman motors seem ideal.  They can be driven at 70 rpm
> with a 12 volt battery.  With a 5" wheel that's
>
>                  2 pi R =
>     2 * 3.14159 * (5/2) = 15.707950 inches per revolution.
>
>         15.708 * 70 rpm = 1099.556 inches per minute
>
>       ~1100 inches per minute
>        91.6 feet per minute
>        5500 feet per hour
>       ~1 mph.
>
> Which seems just about ideal.
>
> That is about twice as fast as any of my existing robots.  Faster is not
> necessarily good.  It gets much harder to control because the robot has
> less time to sample his sensors and make corrections.  These motors
> could be mounted transfering power to the wheel with a final output
> gear for another 2:1 reduction or whatever.  This has some advantages
> for motor placement.  Or a smaller wheel could be used...




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