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Can a commutator be replaced?


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#1 Zippity

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Posted 29 February 2016 - 09:31 AM

I have a BOW G12 armature that I would dearly love to save, but the comm is stuffed. :(
 
Can it be saved?
 
RootedBOWG12armature.jpg




#2 Cheater

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Posted 29 February 2016 - 03:04 PM

Ron,

I've never heard of anyone successfully doing this. The lack of other replies suggests that's the case with most everyone.

Gregory Wells

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#3 Zippity

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Posted 29 February 2016 - 03:34 PM

That was what I suspected, but just had to ask. :(
 
Thanks for replying.

#4 Steve Deiters

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Posted 29 February 2016 - 03:35 PM

Back in the early '70s Rick Davis from Detroit was running armatures from legendary East Coast winder Big Jim Greenaway. Rick told me a couple of years ago if he a particular armature that was good, but the comm was at the end of its service life he returned it to Jim to have it replaced. The arm came back "like new" for another life on the track.
 
How practical this would be with contemporary armatures I don't know. I didn't think if could be done back then, but evidently it could, but when you have a magician/skilled hobbyist doing the winding then anything could happen... and did.
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#5 slotcarone

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Posted 29 February 2016 - 06:59 PM

I can confirm Steve's post about Jim Greenaway!! :)


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#6 Zippity

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Posted 29 February 2016 - 07:08 PM

Well I have just placed this over sized armature into a setup and it is currently breaking-in smoothly at 4 volts.

 

Will drop it into a chassis within the next couple of days and take it for a test run :)


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#7 Phil Hackett

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Posted 29 February 2016 - 08:41 PM

When The Spin Doctor was doing its armature servicing there was an exploration into a method of renewing commutators without replacing them. I was advised by a trusted chemical engineer about what it would take to do so in house. Let's say that it would have required dealing with some nasty chemicals and even though I had dealt with them in previous employment, it just wasn't going to be worth the time and the headaches to pursuit.
 
Yes, it can be done. Like everything else, how much do you love that arm? ($$$)
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#8 Zippity

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Posted 29 February 2016 - 09:04 PM

Amazing, isn't it?
 
We can land a man on the moon. Land a robot on a comet millions of miles out in space. Transplant a live human heart.
 
But can we replace a commutator on a simple slot car motor armature?
 
Noooo...

:dash2: :dash2: :dash2: :dash2:

#9 Mike Patterson

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Posted 29 February 2016 - 09:34 PM

If the comm hadn't been tied and epoxied, it could probably be replaced. As it is, well, I think you're SOL.


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#10 Zippity

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Posted 29 February 2016 - 10:13 PM

So out of luck??    :laugh2: :laugh2:



#11 Phil Hackett

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Posted 29 February 2016 - 10:21 PM

Well, Zippity...
 
It's a matter of whether to deal with some deadly toxic materials to make a few bucks. Now if the US gov'ment were to find that saving slot car arms would be worth $100/each (just some wild figure pulled from the air...) there might be someone already willing to do the work. But with many metal finishing plants closing down because of environmental/regulatory reasons, and also lots of this kind of work exported to China, India, and other places where "dirty" work has been encouraged to go, there's not many places left who'll even try... Me? My cyanide and heavy acid days are long passed by.
 
Again, it's a matter of money and there's no guarantee that the process would result in an armature that would be any good after processing (I left a lot out about the process in the previous post). It would have been a great experiment *but* I was highly encouraged NOT to go down that road by a chemical engineer I had worked with years before.
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#12 Zippity

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Posted 02 March 2016 - 02:24 AM

Alas the BOW is well and truly knackered. :(  :(
 
Dropped it into a BD3 chassis today and took it for a run test tonight. Slower than a house car.
 
Oh well. :)

#13 havlicek

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Posted 02 March 2016 - 06:54 AM

If the comm hadn't been tied and epoxied, it could probably be replaced. As it is, well, I think you're SOL

 
That's only the half of it. The wire has been either welded or brazed to the comm tabs. If this weren't the case and it had been soldered, it might be at least "possible."

 

In any case, all the work involved and the most likely outcome being failure makes this a fool's errand.
 
-john


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#14 wbugenis

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Posted 02 March 2016 - 08:11 AM

I have some of Monty's lams around here somewhere...


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#15 Zippity

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Posted 02 March 2016 - 10:51 AM

Bill,
 
Please PM me with what you have. :)
 
Ron

#16 Buzz-A-Rama

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Posted 08 March 2016 - 11:18 AM

Bill, 

 

I plan on having a class for youngsters between 10 and 13 years of age to wind their own motors.They would eventually compete with each other in a race with said motor.

 

My problem is getting commutators, as I have everything I need including the motors that we will be rewinding. Call me at Buzz-A-Rama any time as I have my number forwarded to my cell phone.

 

Buzz


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#17 Steve Deiters

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Posted 08 March 2016 - 11:22 AM

Buzzi,

 

I think John Havlick could be your "go to guy" for comms. See his posts above. He's always winding something.



#18 Bill from NH

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Posted 08 March 2016 - 12:21 PM

Steve,

 

I believe Bill has the former RJR comm manufacturing equipment. In the past, past, he has sold small lots of them. I know several people, including myself, who have gotten them.

 

I think Bill lives in Brooklyn, too.


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#19 wbugenis

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Posted 08 March 2016 - 01:00 PM

Buzz,

 

I'm in. Will give you a call.

 

Bill


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#20 havlicek

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Posted 08 March 2016 - 01:35 PM

Bill,  I plan on having a class for youngsters between 10 and 13 years of age to wind their own motors.

 
Now that is one of the best ideas I've heard in a while.  Teaching kids the techniques and a little of the science that goes along with it can't be anything other than a VERY good thing!  I was about that very same age when I got bit by the bug.  Until that point, I ran motors until they didn't work anymore.  Sometimes others would help replace or repair something for me, and it all seemed like "black magic".  The first time I opened a motor up and was able to fix something and later see that motor run again, it was like the clouds parted and a heavenly chorus of angels started singing.  No doubt many of these kids will get a huge charge of seeing their motors run!  
 
Tell you what, I don't know for sure if I can make it, but when your plans firm up, let me know and I'll try and be there *if you want*.  You can always PM me.
 
-john


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John Havlicek

#21 Cheater

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Posted 08 March 2016 - 02:11 PM

Somebody has got to document this in some way! I insist on it...

 

It needs to get as much publicity as we can generate, if it does come off.


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Gregory Wells

Never forget that first place goes to the racer with the MOST laps, not the racer with the FASTEST lap


#22 wbugenis

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Posted 08 March 2016 - 02:33 PM

Breaking News!

 

Havlicek travels to a slot car raceway! 

 

(in Brooklyn no less...)


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#23 Phil Worthy

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Posted 08 March 2016 - 03:02 PM

That's so cool!
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#24 havlicek

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Posted 08 March 2016 - 03:57 PM

Breaking News!

 

Havlicek travels to a slot car raceway! 

 

(in Brooklyn no less...)

 

:)

 

-john 


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#25 Samiam

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Posted 08 March 2016 - 05:15 PM

Great idea Buzzi. :good:

 

This is the coolest thing since  "Buzzi's Bunnies"


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