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Balancing machine for slot car armatures

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#1 Cheater


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Posted 14 April 2019 - 08:07 PM

This is not new but is interesting nonetheless. With subtitles...

  • havlicek, NSwanberg, ajd350 and 1 other like this

Gregory Wells

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#2 Jesse Gonzales

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Posted 14 April 2019 - 08:31 PM

Nice video but he has not answered my email asking how much for the whole thing. I've been looking for one and was even doing research to build one. There is another guy in SA that has his own "black box" unit but he too has not responded to the how much inquiry.


Jesse Gonzales

#3 havlicek


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Posted 15 April 2019 - 05:52 AM

This guy has even more "stuff" than I do!  :)


Anyway, I think you linked to this video before Greg... or someone did, and it's a very cool thing.  He has obviously worked out his own system, and has the intuition and experience to know how much to remove and from where.  It all points to two things:

1)  Whoever is doing the balancing (and in his case, the shaft-straightening also) will be working within their own spec/level of acceptability. There may be some (!?) who try to get the arms as close to their machine's limit as possible for every arm, but I think most try to get to an "acceptable" level of balance... a personal spec. or tolerance.  So all balancing is not all the same, the guy doing the work matters!

2)  As in a lot of slots-related work, there's a bunch of homegrown techniques and tooling involved. This guy is cool.



John Havlicek

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Posted 15 April 2019 - 02:05 PM

I got mine through Red Fox Gugu. Madlya also has a tutorial online.
Mike Blevins

#5 Mr. M

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Posted 17 April 2019 - 06:29 PM

I used to race with a guy that I regularly had covered with my G27 motors. All the sudden he is pulling me down the chute by several feet all the time. After much arm twisting he came clean that he bonded with one of the factory guys and was now getting the super tune on balancing. It seemed to have made a difference. Very interesting post with lots of good insight,
Chris McCarty

#6 Mr. M

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Posted 18 April 2019 - 07:26 AM

Without revealing anything proprietary, does this method and hardware compare to commercial balancers used by the usual reconditioning services?
Chris McCarty

#7 NSwanberg


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Posted 21 April 2019 - 03:42 AM

As I understand, it dynamic balancing is basically measured with vibration. As shown in the video, nothing is ever in perfect rotational balance. Except maybe perhaps an electron?


Vibration is usually presented or measured in one of three ways: frequency, displacement and more commonly the calculated value of acceleration from the frequency and displacement. In the captioning, I was looking for a reference to mm/second squared. I saw mm/second. Was it probably an error in the captioning?


On his computer screen, was there any reference to critical rpm?


I thought the use of compressed air as the method for spinning the armature was interesting. It seems to me the air should be directed right on the center of the armature to avoid side thrusts. 


By left and right planes, does it mean the rotating plane and the longitudinal plane or is it just two planes through the armature stack and parallel to each other?


Have any of the balancing gurus ever tried balancing an armature with the pinion gear soldered on. Then removing the pinion gear to assemble the motor and soldering the pinion gear back on as closely as possible to the position it was located on the shaft while it was balanced?

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#8 SpeedyNH


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Posted 21 April 2019 - 09:42 AM

he must have some sort of optical tag on the arm near or at the comm' so that the system knows the rotational position relative to the heavy part(s). I noticed that after a couple secs the light comes on and reads it.

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