15 replies to this topic

[havlicek]

     After disassembling a Mura, and a bunch of cleaning-up (*the can was milled and turned on all five sides), I was left with a set of magnets that I sometimes see.  They are certainly not what was in there when the can was new, but what are they?  They're nice and strong, and have a groove on the back that I assume would be for additional axle clearance.  If the groove was *just* there to allow the magnets to clear the inside of the can welds, a simple "flat" would have worked fine.  So, who sold these magnets, and what's the deal with the groove?

[tonyp]

Interesting. Are they the soft polymer magnets?

[Bill from NH]

They look like Proslot's SMQ's.

[havlicek]

Interesting. Are they the soft polymer magnets?

 

 

Hi Tony,

     Nope, these are regular hard ceramics, and by the looks of them, not that old.

 

 

They look like Proslot's SMQ's.

 

Yeah Bill, but while the Proslots have a "rounded/half circle" shaped groove (*see picture below), these have a "half hexagon" shaped groove.  Here's the Proslots:

 

The ends and the tips of the Proslot magnets are also slightly rounded, while these are pretty sharply cut.  They seem entirely different...*unless Proslot just had them run off several times and changed their shape for one of the production runs?
 

[proptop]

Maybe there was / is more then one version of the "SMQ" that was sold by Pro Slot? I have a couple pair(s) of the ones you show in post #1 John...and they were sold by Pro Slot...

[Fast Freddie]

They are Proslot SMQs.  I have 2 sets in my flat track S16Cs.  They have the same style of grooves as yours.  They were advertised as "Matched" SMQ magnets.  I bought them about 3-4 years ago.

[tonyp]

Back in the day we made some group 27 setups with flats on the back of the magnets so they did not touch the sides of the can to reduce the field.


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[MSwiss]

and what's the deal with the groove?
IMG_2766.JPG

IIRC, SMQ was the acronym for "Single Mag Quad", and the theory was the groove would break up the magnetic field, and the motor would perform like a quad magnet motor, and, of course, still be legal for single mag classes, such as Box 12.

[Don Weaver]

I remember "grooved" magnets like these being called "single magnet quads" too.  In fact, it's the first thing I thought of when I saw them.
 
Don

[havlicek]

Thanks Mike and Don.  The effect you've described (*acting like quads, but still single-mag legal) makes me think these might even be as good as those super-duper mega-zapped-but-still-sealed fk motors I used to see around. 

[havlicek]

The can is painted, magnets are installed, and the bearing is in.

 

For the end bell, I looked around and I actually had one that had never been mounted on a motor before.  It didn't even have can-mounting holes.  So I looked around some more and had a set of hardware that was NOS as well, so I figured I may as well put some hen's teeth on the hen's tooth.    Oh and...I took out the end bell bushing and replaced it with a slightly longer can bushing for a little better wear.  After cleaning off the decades of "patina" from the hardware, I wound up with a pretty sexy end bell...I think!



***To go with all the above vintage niftyosity (*yes, I made that one up!), I decided to do something I've been wanting to do for a while.  When I figured out how to wind "reverse" style, it became apparent to me that a 3-layer coil would be possible in some cases, so I did-up my first-ever 3-layer reverse #25awg wind for this motor.  The arm meters perfectly, and as expected is way way WAY down there resistance-wise.  (DUH!)



Yep...that'll work.  3 layers, count 'em!

[Geary Carrier]

Yep...that'll work.  3 layers, count 'em!

 

I believe you are quite right on that one John...

[C. J. Bupgoo]

            

[havlicek]

Thanks for looking guys.    For all the years since the development of the "C" can, and in all it's endless varieties, it still seems to me to be about the best all around platform for slot car motors.  The minicans are rightfully popular, and of course the strap motors own the super-duper classes, but the good-old C can motor works for so many different classes and budgets, it's like the "Swiss Army Knife" of slot car motors.  

[rodslot53]

Hi John,

How have you secured the can bearing, as I cannot see any signs of solder, or have you used Loctite?

[havlicek]

Hi John,

How have you secured the can bearing, as I cannot see any signs of solder, or have you used Loctite?

 

 

Hi Rod,

     Sometimes I solder them, and sometimes I epoxy them.  Either way, on a painted can you usually can't see the solder on the outside.  This one was epoxied.