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[DPRG] can i use a bulb mounted on an object for identification?

Subject: [DPRG] can i use a bulb mounted on an object for identification?
From: Mike Mccarty Sr jmccarty at ssd.usa.alcatel.com
Date: Thu May 18 10:31:31 CDT 2000

On Thu, 18 May 2000, Sluggy wrote:

> LO VENG CHEONG wrote:
> 
> >   Another problem met is that two motors rotate on different speed even
> > giving the same PWM signal. So, it can't go straight. Then, I tried to
> > tune the motors by adjusting the power level using the PWM technique. And,
> > it can roughly go straight now. I know that it is not a good method. I
> > should use the shaft encoder. 
> 
> You are likely to find, even with shaft encoders, that the motors will
> actually need to run at different speeds. Not only will the motors run
> slightly different speeds on their own, the wheels are unlikely to be
> identical, even if you put them on a lathe and cutting them to size
> (though that will help).

[snip]

Are you saying that even if one chucks up the wheels at the same time in
a lathe, and cuts them together, then the motors need to run at
different speeds? Is this due to slippage?

Mike



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