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Any ideas where to get electric motor brushes?

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jan 04, 2021 9:25 am Post subject: Any ideas where to get electric motor brushes?

At 10:43 PM 1/3/2021, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com>



 Hi Group

 I need some brushes for the exciter on my Monarch EE lathe. Was making some aeroplane parts and it quit.

 Sizes needed:

 3/8" x 3/8" and worn out length is 1.060", it has a shunt and terminal (need 4, will buy 

 1/2" x 1/4" and worn out length is .495", it has a shunt and terminal (need 2, will buy 4)

 Any ideas where I can purchase from?

 	


    About 40 years ago I had ready access to

    a stockroom of brushes that would probably

    have yielded something that would cut-down

    to suitable profiles. Alas, no more.



    There are listings on eBay (40,000+) that

    might produce useful candidates but most

    come out of China . . . so it depends on your

    urgency.



    I've cut down many a brush on a mill. In

    your case, avoid brushes destined for use

    in h9gh current, intermittent motors like

    starter and winch motors.



    There are hundreds of 'recipes' for brush

    make-up . . . unless you order spares from

    the original manufacturer of you motor,

    finding an exact replacement for size and

    content is problematic.



    However, for anything less then high duty

    cycle applications, optimization of recipe

    will have little significance on service

    life of your substitution.



    You might research DC motor overhaul

    services on the 'net. They may have

    spares suitable for modification if not

    okay as-is. Keep your old springs if they're

    not obviously compromised.



    1" is pretty long for a worn brush . . . 1/2"

    values are quite common. Is that in a 4-pole

    motor? What are the nameplate sizes for these

    motors?



 



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jan 04, 2021 9:38 am Post subject: Any ideas where to get electric motor brushes?

At 10:43 PM 1/3/2021, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com>



 Hi Group

 I need some brushes for the exciter on my Monarch EE lathe. Was making some aeroplane parts and it quit.

 Sizes needed:

 3/8" x 3/8" and worn out length is 1.060", it has a shunt and terminal (need 4, will buy 

 1/2" x 1/4" and worn out length is .495", it has a shunt and terminal (need 2, will buy 4)

 Any ideas where I can purchase from? 	


   check out these guys   https://tinyurl.com/yczw98h4 and no doubt

   there are others.



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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rparigoris

Joined: 24 Nov 2009
Posts: 792

Posted: Mon Jan 04, 2021 2:11 pm Post subject: Re: Any ideas where to get electric motor brushes?

Hi Bob It's for a 1941 Monarch EE. It has a 5HP 3 phase AC motor that spins a 4 pole DC generator, the generator is connected to a 2 pole exciter and the DC motor is 4 pole. In 1941 they didn't know how to speed control an AC motor so they did so with a DC motor. I forget exactly the hocus pocus they are doing, it doesn't have a huge tube, but slow speed torque is quite impressive. I need exciter and generator brushes and will probably change the motor brushes as well. All 3 devices have shunt wires. How do I determine what hardness I might want? The exciter brush has 600 on it. The generator brush has 063A on it. I have a call into Monarch, but my generator and exciter may not be stock. Thx. Ron P.

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