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[DPRG] Re: Pittman motors at Tanner's

Subject: [DPRG] Re: Pittman motors at Tanner's
From: Robert L. Jordan rljordan at airmail.net
Date: Tue Aug 14 20:59:43 CDT 2001

DPA, Jeff, and other anxious roboteers,

IMHO, The "Club Robot" idea is cool but I think we should 
get a platform working, with intermittent gearing, 
mounting, &  wheels defined. All this before 
we look at doing a group buy of motors or sensors.

A few changes now is easy. Could be a mess later.

Regards,
Bob Jordan

-----Original Message-----
>From:	Jeff Koenig [SMTP:jkoenig at airmail.net]
Sent:	Tuesday, August 14, 2001 8:29 PM
To:	dprglist at dprg.org
Subject:	Re: [DPRG] Re: Pittman motors at Tanner's

DPRG -

The venerable dpa wrote:

>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.

I'm assuming that these are no-load calculations.  How much do you
think they will slow down under load?

I'll buy 4 motors.  If someone is going to bring some to RPL, I'll be there,
and if not, I'll try to get to Tanner's this Saturday and pick some up.

I like the idea of a < 10lb. robot platform, big enough to wander the
halls and small enough to get through doorways easily.  What is the
shaft diameter of these motors?

You guys are right, the stripping thing isn't an issue.  One could always
use
current sensing to shut down the motor before its stall current has been
reached.

Like I said, I'd be happy to help out on a club robot.  I'll dig up my
drawings and
try to find my folder of cool looking robots that I've cut out of magazines
for the
last decade...

Later,
Jeff



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