[R-1051] R-1051 Motor Problem

[Larry Kirkland]

Well, I think I found the problem.  The motor relay is sticky and slow 
to release.  It was taking about a second for the relay to open when 
coil voltage was removed allowing the motor to overtravel.  In fact the 
relay is completely stuck now and will not actuate at all.  I have a big 
junk box of relays and may have something close.  If not, I may ask the 
group if anyone has a spare.  Stay tuned.

Larry


Cecil Acuff wrote:
> 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
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