[R-1051] R-1051 Motor Problem

[Cecil Acuff]

That's a new one....

Never seen that....wouldn't expect you to be able to make the motor/gearbox 
better than new.

I would jam the two beveled gears up a bit tighter to generate a bit more 
friction on the gearbox and drive train and see if you can't slow it down a 
bit!  Normally they don't coast at all...or not any great perceivable amount 
anyway.  There is no adjustment on the MC switch stack either.  The RF deck 
has some adjustment of the switches that align it's stopping point probably 
because of the rotating mass associated with the turret.  You didn't 
disassemble the Mhz switch stack to do this work did you and possibly get 
the encoder wafer 180 degrees out....just a thought!

Cecil....
----- Original Message ----- 
From: "Larry Kirkland" <lkirkland at sc.rr.com>
To: "R-1051 Discussion Group" <r-1051 at mailman.qth.net>
Sent: Wednesday, June 14, 2006 9:07 AM
Subject: Re: [R-1051] R-1051 Motor Problem


> Cecil and group;
>
> Here's where I am with getting the R-1051 running.  I cleaned up the stuck 
> motor that selects the crystal position in the MCS Synthesizer module. 
> Now it runs fine, maybe too well.  When I select a new MC, the motor runs 
> to the correct switch position, 28 vdc is shut off the motor, but the 
> motor coasts past the correct point as it is spinning down and touches 
> onto the next switch position where 28 vdc is supplied again.  the motor 
> starts up again, the switch makes another 360 degrees and the process 
> repeats itself.  It's like the motor is not dynamically braking or there 
> is not enough friction to stop the motor fast enough. Have you ever seen 
> this happen?
>
> Larry W4LK
> _______________________________________________
> R-1051 mailing list
> R-1051 at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/r-1051
>