12 replies to this topic

[Pablo]

Red Valentine obtained this from Dallas' collection and placed it in my hands to do with it whatever I see fit. It may be some time before I decide what to do with it but I promise I'll do the right thing.

 

 

Motor is heavily modified, endbell is vented, arm is rewound, epoxied and balanced, looks nicely wound and the mags feel strong - 36D Arcos?

 

 

Check out the balancing - one pole has the stacks simply ground flat top to bottom 

 

[Bill from NH]

Dallas had some neat old slot cars based upon the two recent posts I see here,

 

36D Arcos had a "U"-shaped shim that would have closed off one of the two vent holes. How does the can's bottom vent hole look?

[Pablo]

[dc-65x]

Hi Pablo,

 

Looks like your tumbler (and that Mississippi water) are going to get a workout.

[Pablo]

Maybe. Maybe not 

[dc-65x]

Sorry Pablo, I didn't mean to tell you what to do with your project. And I certainly didn't want to start another debate on restoration.

[Pablo]

No problemo. I may just leave this one as-is 

[Bill from NH]

Looks like a Champion shim to me, per your assumption, the mags probably are Arcos.

[Pablo]

The time has come to dig into the Dallas 36D lead sled plumber    Remember the kid's magazine back in the 60's - "How many things can you find wrong in this drawing?" This chassis has lots of problems and not much worth trying to fix:

 

-All moving parts rusted shut

-Lots of damage and misalignment

-Confused design, especially the motor box. Looks like it was intended for an endbell drive?? The cut in the EB looks like an attempt to use a straight main rail under the EB design but it wasn't used that way. I don't even know how to describe it but bottom line is, this was a ship without a captain, and the motor box looks like it has room for a inch-and-a-half long mystery motor

-WB is 4 3/8", a bastard size

-Width is 3 1/8

 

I could built a brand new chassis in less than half the time it would take to make this relic right. So, I scrubbed it to remove the big chunks of crub, bathed it in WD-40, bagged it up and set it aside

 

 

Motor has a cracked and melted endbell flange. Removed from the chassis, solder blobs sucked, 12T brass press-on pinion removed. The can and endbell have various cooling holes. Can has a ball bearing. No post protectors, stock springs. The motor was only secured on the can end, so the chewed up pinion was caused by the motor see-sawing up and down trying to eat the spur

 

 

[Geary Carrier]

Pablo this is gonna fly...

[Pablo]

Motor disassembly reveals:

 

-Nothing on EB is salvageable - bushing flange cracked and melted, post protectors melted, bushing sloppy, hardware ruined and broken

-Arm used to be a very nice item, well made. It has a slight CCW timing, super neat and epoxied winds, nice comm, and an interesting balance method on one of the lams. Unfortunately, the shaft isn't straight, it's badly galled, and worn enough to mike from .088 to .091" depending on where I measure it. The spacers used were really sloppy on the shaft also.

-Can BB and mags seem OK

 

 

Post-mortem summary:

 

This motor was a casualty of poor assembly. Slop was about 1/16" and when the arm went to the EB side, it was doing some chewing. Which led to heat, melting the EB bushing flange, causing a wobble, ending in extreme heat and excess wear on the arm shaft. The motor wasn't properly secured in the chassis, causing the gears to self-destruct and contribute to the overall trauma    It's a shame because the arm, IMO, is truly sweet but is useless without a true shaft

 

[Martin]

Thanks for sharing the tear down process. Some anthropology, some component evaluation. I enjoy this part. Even if most parts cannot be saved.

Sometimes mine get bagged and tagged for future build inspiration.

[zipper]

Huh - the axle looks like my ancient Steube after a seized bushing ruined it. Luckily I could extent the bushing with an added ball bearing and use the arm still.