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Full-can magnet shims


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#1 havlicek

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Posted 29 November 2017 - 08:00 PM

With a lot of "the good stuff" getting pretty scarce, it pays to look at repurposing seemingly useless parts.  Of all the vintage magnet shims, I think the two-piece Champion shims ("semi-can" shims) are about as good as it gets.  You can easily fit C can magnets in a D can motor and wind up with a workable hole.

Well, whenever I've been motivated to do so, there's another way to have at this.  A "C" can is a tight fit inside of a D can...so tight that, depending on which C and which D cans, it can either go with some force (*an arbor press is really handy), or not go at all.  It can help to take down all four sides of the C can, but doing that by sanding is painfully slow.  Now that I'm part-way into the 20th Century (while the rest of the world is into the 21st Century), there's a better way...it's called machine tools.  :)

 

Sooo, starting with this later (I guess 1990's or so?) C can, I decided to take down a pair.  One would be used as a full can-shim, the other would go back into my pile-o-stuff where it could be built into a motor, or further cut up as another shim.

IMG_2340.JPG

It only really takes pretty much what the can needs to be flattened out, for it to be a nice "slide-fit".  Of course, the arcs are a bit different, but the inner "C" can will touch the center of the outer "D can" on the two curved sides, and the top and bottom flats will match-up really nicely.

IMG_2342.JPG

What you're left with is a can that you can install "C" sized magnets into and then slide *that* all into a D can where it can be epoxied in place.  Pretty nifty!

IMG_2341.JPG


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#2 Mike Patterson

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Posted 29 November 2017 - 09:29 PM

So, what endbell will you use, C or D?

 

I'm curious to see how this will work, with that much can material.


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#3 Geary Carrier

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Posted 29 November 2017 - 11:34 PM

Hi John,

 

Now that is one fancy flux yoke...

 

 

Thanks,

g


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#4 olescratch

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Posted 30 November 2017 - 02:20 AM

So, what endbell will you use, C or D?

 

I'm curious to see how this will work, with that much can material.

Yeah!  It looks like neither one has enough room, but I'd guess the endbell will fit the outer can. 


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#5 havlicek

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Posted 30 November 2017 - 06:03 AM

Yeah!  It looks like neither one has enough room, but I'd guess the endbell will fit the outer can. 

 

 

Well of course, this is for a D end bell.  In the picture, the shim isn't slid all the way in so you can see it.  :)  Functionally, it all works exactly the way the Champion semi-can shims do, except it's in one piece instead of two "clamshell" pieces.  Again, the benefit here is having many choices for magnets and armatures.  Instead of using the EPX magnets, and then a .560" arm (*which works well of course), you can use any C can magnets and a small diameter arm.


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#6 havlicek

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Posted 30 November 2017 - 08:08 AM

...more description.  If you cut off the "back end" of the can where the bearing strap is, you have more than enough room to slide the magnets and shim into the can and mount the standard D can motor end bell.  Actually, if you want to save even more "weight", you can cut off the front end of the can where the old C can end bell mounting holes are, and only leave as much of the old can as covers the magnets themselves.  This would be significantly less metal than the old semi-can shims.  You have to be careful as to how deep you set the magnets/shim because there's gobs of room in there after all the cutting.


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#7 havlicek

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Posted 30 November 2017 - 08:23 AM

...oh and BTW, who's can (what brand) is this?  Except for the too-small tabs where the end bell is supposed to be mounted, they're kinda neat.


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#8 old & gray

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Posted 30 November 2017 - 08:41 AM

Pro Slot (Champion) mid to late 1990's


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#9 havlicek

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Posted 30 November 2017 - 04:25 PM

Thanks for the info Bob!


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#10 havlicek

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Posted 02 December 2017 - 09:28 PM

...and.....BAM!

Another Russkit "22" go the usual "treatment", strip/sand, drill for end bell screws, remove/replace can bushing, new paint (gold + clearcoat), can drilled for the choice of either can or end bell drive, and then I installed the shim with a pair of "yellow dots" that came up really nicely :bb: with a zap after removing all the old epoxy and gunk on them.  Setup was also honed, really to check that the shim and magnets were well-centered...and they are.  Final "hole" is a bit under .530".  So I pressed a stack spacing the shaft for either can or end bell drive.

I chose a Hong Kong Mabuchi end bell for this one, and I machined the bottom and top flats so they're not so proud of the thinner Japanese can metal.

IMG_2348.JPG


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