101 replies to this topic

[Pablo]

So I guess you don't want the jig motor?  

[Cheater]

I'll respectfully pass...

[Bill from NH]

Do polished brass surfaces tarnish quicker?

[Pablo]

I dunno. Ask brassy.
 
Wanted to try a different adhesive for the inserts, so I did a test run first on some other wheels.
 

[Pablo]

JB Weld "Plastic Bonder" worked great. I tested it by trying to push the test inserts out with the dummy axle. I'm pretty sure they'll break before they come loose.
 

 
Luciano opted for an endbell upgrade for the sweet Havlicek powerplant. The motor was running strong and cool as is with standard-sized 16D brushes, so I didn't think it prudent to switch the Tradeship to 36D holders. Holders are soldered to the hoods, polished, and aligned.
 


As long as I'm messing with endbells, might as well upgrade my jig motor also - the white one is so distorted I can't trust it to align the tilt on brackets any more.
 
 
 
Found a sweet FT16D black one that looks like the victim of a hot rewound arm with weak magnets.

[Pablo]

Endbell swap is complete. Of course, with the changes it needed to be broken it again.
Rotation was immediate with the first "click" of the power supply, she drew 1.1 amps at 3 volts, then started dropping.
Always the mark of a good set-up, at least on my equipment it is. After 15 minutes the amps were down to .85 and had stabilized.
Runs very smooth and cool, sounds potent when I feed it some volts. 
 

 
Another typical Havlicek FT16D motor - great performance. I don't know how he always gets them to run so well with stock size 16D brushes, but he does.

Pinion is a new Sonic steel 7t press on. Should work great with the Weldun 32t crown.

[havlicek]

Nice work, Pablo!
 
-john

[Pablo]

Thanks, John. I feel like I just performed successful surgery on your infant.

Piece of cake. Zero change needed on the spacing and it's perfect.

[Hworth08]

A bit off-thread but if all that's wrong with the endbell in post #55 is a melted post, that can be fixed.
 
Just cut off the melted post, "center punch" the center of the old post with a knife and drill 1/16". Cut a length of 3/32" tubing the same as the post was. Install a spring and attach with a 2-56 self-tapping screw.
 
This worked so well that some times we did this to a new endbell.

[Pablo]

Not off thread at all, Don.

I'll take a better look at that end bell and maybe swap it for a worse one.

Thanks for telling me before I cooked it with the torch.

[Pablo]

Wheel inserts ready. I masked three spots on each for the adhesive to bite unpainted plastic

 

[Pablo]

Noose, Tony P., and dc-65x were extremely helpful in my planning - without friends like them, I'd simply be lost.
 
Final answer for the Dilworth Honda chassis dimensions:

Wheelbase: 4.125" (4-1/8")
Guide lead: .625" (5/8")
 
Jig motor is trued and checked in all directions - tilt, left/right, and flat.
 

[Pablo]

Slight inward taper begins in front of the motor.
 

 
First set of rails tacked in place.
 

[Pablo]

Q/A: checking the math to verify the taper is going to work.

Inside widths of the body, front, middle, and rear, are about 1.20", 1.30", and 1.25" respectively.
Outer edges of the rails mike .805", .895", and .863" (they bulge outward slightly from the bracket face to the taper points).
Six .0625" rails = .375"
Front .375" + .805" = 1.18"
Middle .375" + .895" = 1.27"
Rear .375" + .863 = 1.24"

Looks good on paper
 

[Half Fast]

Is their a photo of what the original chassis looked like?

 

Build on!

[Pablo]

Thanks for asking, Bill.

Morrissey GP Car Article

Courtesy of Rick Thigpen and Paul Kassens.

[Pablo]

Professor Motor Russkit replica wheels shod with SBR rubber.

 

One turned out fine; the other didn't.

 

 

They won't leave here until they're both perfect.

[Pablo]

It appears the math and planning for the "semi-form fitting" rails worked.

Overall widths are:

1.203"  front

1.275" middle

1.243" rear

 

Starting to look like a slot car chassis.

The midriff bulge isn't as pronounced as it appears in this photo

 

 

Now, where did I put those doggone Dremel 409 cutloff wheels?

[Pablo]

For you donut-mounting aficionados, I discovered something:

Sleeving 1/8" wheels to fit the 3/32" JK tool shaft isn't necessary like I thought.

 

 

Neither is making the cone (axle) hole a precise fit. Both hub and cone can be sloppy on the shaft and it works like a charm.

What is important is spacing the hub the proper distance away from the hilt, and ensuring the cone OD is slightly larger than the hub lip.

 

This particular hub needed to be spaced further out than normal due to the taper of the pre-trimmed donuts.

The soaked donut slides onto the hub, then both hub and cone slide right off.

A quick swipe with a thinner soaked Q-Tip and Bam! Done.

 

[Pablo]

After trimming the uprights, she goes onto the flat block for a check.

Perfectly flat, and the bushings are still in perfect alignment. 

 

 

Note the slight bulge and taper - I think Morrissey's rails were straight, but he used a different brand of Honda body. I'm sure he would approve of my artistic license to improvise for the body on hand.

 

Many PMs were sent before I decided to do it this way. 

[Pablo]

Rails to bracket/rails to front axle tube joints all finalized.

 

The first rails inside the bracket both needed more solder. Hard to get the Ungar in there, so... I laid a pair of .032" solder pieces alongside, bathed it in acid, and fired up the mini torch.

 

 

This photo is dedicated to Bob Suzuki, a fellow mini torch user from way back...

 

 

Not many people know this - Bob is a supreme artist.

 

[endbelldrive]

Did somebody mention torch? Let's light that candle!

[Pablo]

Yeah, baby, yeah!!

 

The measurements and math worked, because it form fits the Dilworth Honda pretty well. 

 

 

It wasn't easy doing the rails that way. Hopefully the handling will benefit from not having to stress the body much.

Tony P told me the butyrate bodies the pros used back in the day took a set well, so they just forced them to fit.

 

Tom Scott told me this Pablo curved rail chassis was the best handling vintage F1 he'd ever driven:

 

[SlotStox#53]

Now I like that curvy rail F1, Pablo. 

What is the shell you built it for?

[Pablo]

I think it's a '66 Cooper-Maserati, Paul:
 
Curved-rail vintage Classic-powered F1