¿ªÔÆÌåÓýHi Fred, What you may wish to try first is to use Kadee fiber washers, which come in several different thicknesses.? You can try to use a feeler gauge to see what thickness would take up the slop and the use appropriate thickness fiber washers.? You can cut a pie section out of the washers and force them onto the shaft at the back end of the armature.? If needed, you can use super glue to keep them there. Depending on the motor, you may be able to take apart the magnet end and put washers directly on the shaft.? But, taking out the magnet could cause it to get weak.? If you want to try that, I suggest getting some neodymium
magnets to replace the magnet.? I have never heard of neodymium magnets losing power when removed from the motor.? The ONLY reason I would remove the gear is if I would want to replace the motor with a can motor, but then you would likely need a sleeve for
the new smaller motor shaft.
Vic Bitleris Raleigh, NC
From: yardbirdtrains@... on behalf of fred hanes fred_hanes@... [yardbirdtrains]
Sent: Wednesday, March 21, 2018 1:10 PM To: yardbirdtrains@... Subject: Re: [yardbirdtrains] Bowser DC-71 new motor noise ?
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Hi Vic, great suggestion.??? I agree there seems to be some play in the armature.?? ?To get the washers onto?the motor shaft ?I believe ?I must take the motor
apart, which I have never done before.? I have a number of similar motors in other locos and I'm excited by the prospects for improving them too.
I've done a web search for this process but haven't found much.
I think I will need to un-solder the worm from the shaft, then unscrew the top and bottom motor plates to release the armature?
Is there a risk of losing power from the magnet if the motor is opened up like this ?? Any tips for handling the magnet?
The motor is a straight-pole Bowser design, not the newer skewed pole, so I assume it has an Alnico magnet?
Thanks..
Fred Hanes, San Jose, CA
On Tuesday, March 20, 2018 7:59 AM, "Victor Bitleris bitlerisvj@... [yardbirdtrains]" wrote:
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I suspect that the armature has play.? When in reverse, it is pushed toward the magnet and all play is gone.? When in forward, I bet the armature goes back and forth.? If that is the case, you may be be able to
use the Kadee fiber washers to shim it.
This is a pretty common occurrence in Mantua motors as well.
Vic Bitleris Raleigh, NC
From: yardbirdtrains@... on behalf of fred_hanes@... [yardbirdtrains] <yardbirdtrains@...>
Sent: Monday, March 19, 2018 12:32 AM To: yardbirdtrains@... Subject: Re: [yardbirdtrains] Bowser DC-71 new motor noise ?
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Hi Group thanks for all the great tips.
The Bowser motor by itself now runs pretty quiet..
With the motor attached to the chassis and the basic drive train assembled, I get noise going forward but almost silence in reverse.
I've tried shim washers under the motor to change the gear mesh but no big changes in noise.? Should I try washers under both the front and rear motor mounting points at the same time?
Maybe noise is coming from the axles turning in the bearings?? I see some play when the wheels are turning.
I wish I had a nice power supply setup with a current meter, maybe down the road.? For now I'd be happy to tune the motor by ear so that the noise forward equals the noise in reverse,
Any tips?
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