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Hawk Retro Big Wheels Cucaracha


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#1 Pablo

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Posted 14 March 2019 - 06:11 PM

This will be another "Cuc-on-a-budget" theme scratchbuilt with a toothbrush motor.

Like (almost) everything else here at The Wolcott Cockroach Ranch, it is for sale  :)

 

Body is a beautiful Gene/ZR1 La Cucaracha replica, absulutely stunning quality and same dimensions as an original Cuc (as opposed to the TrueScale Cuc and Billy Watson Cuc which are 1/8" wider).

 

Orange donuts on mag 3/32 rims will be trimmed to 7/8 OD

 

IMG_1818.JPG

 

WB 3 7/8, GL 11/16, front wheel width 2 5/8, rear wheel width 2 7/8.
Clearance .032 front, .063 rear.
Gearing: 8/27


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Paul Wolcott




#2 Pablo

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Posted 15 March 2019 - 06:06 PM

1" wide JK hypoid retro bracket, braced and tubed with oilites

 

IMG_1745.JPG


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Paul Wolcott

#3 Pablo

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Posted 17 March 2019 - 09:07 PM

Jig motor and bracket assembly set in perfect alignment

 

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Steel tongue mini-torched atop .063 X 1" X 1" brass chunk with some lift to account for the .032/.063 clearance slope

 

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Paul Wolcott

#4 Pablo

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Posted 23 March 2019 - 03:21 PM

Caveman Bodeez driver has arrived here at the Wolcott Cockroach Motel.

Look at the baggie closely and you'll see even the staples are painted.

Very professional work and service :sun_bespectacled: :good:

 

IMG_1819.JPG


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Paul Wolcott

#5 Bill from NH

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Posted 23 March 2019 - 03:53 PM

Colored staples are available at Staples Office Supply stores & online.


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Bill Fernald
 

:) Insect jokes bug me! :)


#6 Pablo

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Posted 23 March 2019 - 07:03 PM

Main rails - single pair of Swiss .063 wires. It's a small short car, that's all it needs

 

IMG_1826.JPG


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Paul Wolcott

#7 Pablo

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Posted 23 March 2019 - 08:25 PM

The original Cuc was a great design, allowing the front wheels to float over bumps. I plan to do the same thing here, without hinges. My "Driftin' Fifties" proxy Maserati car worked well using this design

 

IMG_6908.JPG

 

I call it "torsion ISO" - the front axle/wheel assembly can lift and tilt slightly via free rails

 

IMG_6790.JPG

 

This design worked well so I'll use it on this car :)


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Paul Wolcott

#8 Martin

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Posted 24 March 2019 - 12:16 AM

That is a great looking chassis. :victory:


Martin Windmill

#9 Pablo

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Posted 24 March 2019 - 07:58 AM

Thanks Martin. If nothing else, it was consistent - 2nd, 2nd, 3rd, 2nd, 2nd.

Third place overall for the series, behind Steve-a-Roonie and Greg Gilbert  :D


Paul Wolcott

#10 Pablo

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Posted 24 March 2019 - 07:18 PM

I wasn't comfortable with the big sleeved Russkit front wheels, so I changed my mind.

Found a pair of old style 3/32 O-ring front wheels and faced four retainers

 

IMG_1835.JPG

 

Fronts and tinned wire axle done, set at 2 5/8" width

 

IMG_1840.JPG


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Paul Wolcott

#11 Pablo

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Posted 24 March 2019 - 07:58 PM

Dummy axle jigged up for the .750 OD O-ring wheels to clear .032

 

IMG_1852.JPG


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Paul Wolcott

#12 Pablo

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Posted 25 March 2019 - 05:26 PM

Torsion ISO front axle management will be via a single pair of Swiss .063 wires connected to the bracket and tube rear

 

IMG_1853.JPG

 

Then they free-float-flex all the way forward until connecting to the front axle. When you don't have a lot of horizontal space to work with, you go up, not out. See the 15 thou wire piece taped onto the chunk? Once removed, that space becomes ISO drop for the front wheels.

 

IMG_1854.JPG

 

Things are gonna get freaky, stand by. I'm not even 100% sure it will work. We shall see  :)


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#13 Pablo

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Posted 26 March 2019 - 07:13 PM

ISO torsion rods secured to the bracket and tube. Solder stops wicking forward right at bracket face

 

IMG_1860.JPG

 

Additional (.055) upright wires strengthen the front axle connection. 15 thou spacing wire removed.

I can afford to be ham fisted with the Dremel when trimming the uprights - note the gouges in the 3/32 dummy axle  :D  The assembly turned out just like I wanted - when I press down on the axle it flexes down 15 thou and stops on the front chunk

 

IMG_1865.JPG

 

Next step - 15 thou axle up stop and left/right flex limiter. For this to work, the movements have to be well controlled :wink2:


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Paul Wolcott

#14 Geary Carrier

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Posted 26 March 2019 - 07:18 PM

Well done and then some... :good:


Yes, to be sure, this is it...


#15 Jaeger Team

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Posted 27 March 2019 - 03:39 PM

ISO torsion rods secured to the bracket and tube. Solder stops wicking forward right at bracket face

 

attachicon.gifIMG_1860.JPG

 

Additional (.055) upright wires strengthen the front axle connection. 15 thou spacing wire removed.

I can afford to be ham fisted with the Dremel when trimming the uprights - note the gouges in the 3/32 dummy axle  :D  The assembly turned out just like I wanted - when I press down on the axle it flexes down 15 thou and stops on the front chunk

 

attachicon.gifIMG_1865.JPG

 

Next step - 15 thou axle up stop and left/right flex limiter. For this to work, the movements have to be well controlled :wink2:

I wonder if you'll cut in a half the dummy axle before removing it


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Maurizio Salerno

#16 Pablo

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Posted 27 March 2019 - 04:20 PM

Yes of course I cut it into several pieces. If you are creative with the cuts and the heat generated by the 409 cutting disc, the pieces will fall right off without even needing the iron :D Then I go back and SODER-WICK® the uprights clean before installing the actual axle


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#17 Pablo

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Posted 27 March 2019 - 06:15 PM

Twin .039 wires give 15 thou lift

 

IMG_1871.JPG

 

Now the axle can wiggle side to side just a little, with 15 thou drop and lift.

If you could pick it up by the tongue and feel the axle movement, you'd say "oh yeah" :)

 

IMG_1873.JPG

 

 


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#18 Pablo

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Posted 29 March 2019 - 05:06 PM

Before attaching hinges I needed to space the rails out away from the torsion wires.

Three wire pieces on each side then a rod

 

IMG_1885.JPG


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Paul Wolcott

#19 Pablo

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Posted 29 March 2019 - 06:56 PM

Once appendages are secured in perfect positions, nothing beats a wood block to finalize the joints

 

IMG_1887.JPG


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#20 Pablo

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Posted 30 March 2019 - 04:54 PM

Slot car chassis "selfie" :laugh2:  With four rods per side, the outriggers felt too light to my educated meaty fingers. The body isn't a lightweight at about 15 thou, so it needs some heft to keep it from lifting. This isn't something I can measure or prove, just my feeling based on experience.

 

So, I added two more rods per side. Six feels much better :good:

 

IMG_1889.JPG


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#21 Pablo

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Posted 31 March 2019 - 07:00 PM

Pan management done, rear axle tube sliced

 

IMG_1893.JPG

 

Time to slice the front dummy axle. Mauricio, this one's for you :)

 

IMG_1895.JPG

 

My big question was, once the support of the dummy was gone, would the torsion ISO wires lose their precise "at rest" placement midway between the up and down stops? Answer: No. :good: :sun_bespectacled:

 

IMG_1899.JPG

 

 


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#22 Jaeger Team

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Posted 01 April 2019 - 01:58 AM

:clapping:  Will you tape again the 15 thou wire piece onto the chunk before the front axle's final soldering? Thanks a lot for sharing.  :)


Maurizio Salerno

#23 Pablo

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Posted 01 April 2019 - 05:29 PM

Yes, absolutely. But it doesn't need tape at this point, it just snugs right in there.

Orings installed and a piece of .032 under the chunk for clearance

 

IMG_1904.JPG

 

And of course a piece of .063 rod in the rear for clearance

 

IMG_1907.JPG


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Paul Wolcott

#24 Pablo

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Posted 01 April 2019 - 06:10 PM

Axle secured, Orings come off, and into the tumbler she goes

 

IMG_1915.JPG


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#25 Pablo

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Posted 01 April 2019 - 09:04 PM

Body washed and (inside) decaled

 

IMG_1919.JPG  


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