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Snake Bite III


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#1 Pablo

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Posted 22 May 2015 - 04:04 PM

Finished July 2015:

post-91-0-69299100-1434904659.jpg

 

post-91-0-65038900-1435013303.jpg

 

post-91-0-04579600-1436312179.jpg

 

Here's how it all started:

Snake Bite I was created by Greg Wells, finished and assembled into a complete car by Yours Truly.

 

Snake Bite II was my attempt to improve upon Greg's two-piece design by using a one-piece with a torsion tongue.

 

Snake Bite III is a return to SB I design - a two-piece using the original R-Geo Samurai pan.

 

I drew this rough sketch on a napkin at the Mustang Ranch bar last week:

 

IMG_4638.JPG

 

Spent about three hours perfecting the pan, then mocked up the parts for a photo.

(yes, Bunky, that is a Turning Man tongue and a Chicagoland wide bracket)

 

IMG_5066.JPG


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#2 Eddie Fleming

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Posted 22 May 2015 - 08:27 PM

I like the one on the napkin better.
 
Just kidding.  :D
 
It will be interesting to see what you come up with.
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#3 Pablo

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Posted 23 May 2015 - 06:26 PM

Pan plate trimmed, edges rounded, sanded, flattened, and finished.

IMG_5091.JPG
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#4 Pablo

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Posted 24 May 2015 - 06:48 PM

Chicagoland Wide bracket, almost perfect right out of the bag.

.032", .039", and .055" wires, short pieces of 1/8" brass angle in the corners, and a strip of .063" by .307" by 1.275" brass at ground zero.

That should make it strong enough to survive anything.

IMG_5156.JPG
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#5 Pablo

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Posted 26 May 2015 - 07:19 PM

1/8" brass angle pieces, .055" body clip holes for JK Indy 2" clips, and .032" wire pieces to stiffen and strengthen the pan.

IMG_5187.JPG
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#6 Pablo

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Posted 27 May 2015 - 01:17 PM

This is just a "mock-up" to see if I liked this tongue/rail interface, so it's just tacked in place.

 

My "intel source" couldn't find anything negative to say about it, so, onward we go. :)

 

The .063" brass connector between the .078" V rails and the "Turning Man" .042" steel tongue is level with, and on top of, the rails (photo is up side down).

TM is attached below the connector, making the rotating surface about .036" above ground zero. (.078" minus .042" = .036")

A cut-down style guide flag will work perfectly.

 

IMG_5212.JPG

 

Tongue face .036" above ground zero over a .032" pan gives me .004" clearance.

 

Now that I'm sure this will work, I'll "sano" it up and go forth...


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#7 Eddie Fleming

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Posted 27 May 2015 - 05:46 PM

You are very close to something I have been thinking about. If the tongue is allowed enough upward movement in relation to the pan the guide will be self adjusting to the track braid depth.

 

I assume the front wheels will be mounted to the pan.

 

The question is will that put enough weight on the guide?


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#8 Pablo

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Posted 28 May 2015 - 11:32 PM

This tongue assembly will be set up very much the same as SB I - the weight of the chassis will rest on the tongue area.


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#9 Pablo

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Posted 10 June 2015 - 09:18 AM

I measured the angle needed for the tinned .078" wire "V" rails from the front of the Chicagoland Wide to the correct spot on the tongue at 12 degrees.

So I made my bends - they only need to be approximate right now.  I left extra wire to go slightly past the rear of the bracket faces. I'll cut those off later.

 

IMG_5306.JPG

 

IMG_5319.JPG

 

I want to make the rails end in a sharp "V" in front, so I'll grind flat spots on them.  

Now you know why I wanted to make the bends first - when the wires lay on the sander, the flat spots will be 90 degrees to the bends.

Since I couldn't get the angle tool in there close enough, I simply marked the angle where I needed it with a Sharpie:

 

IMG_5309.JPG

 

"Turning Man" steel tongue tacked to a Slick 7 .032 steel tongue:

 

IMG_5315.JPG

 

Pan assembly in perfect position. Note the Sharpie mark that indicates the forward extreme of the pan rail notch - I won't be able to see it once the tongue is placed over it:

 

IMG_5316.JPG

 

Tongue assembly placed upside down and taped flat to the pan. If it was correct side up, I couldn't see the TM when I mark where to cut the rails.

 

Note the TM has a built in 2 degree tilt so I purposely didn't use the knurled R-Geo nut to hold it down - if I did, it wouldn't lay flat on the pan, and my measurement would be off a little.  :shok:

 

IMG_5318.JPG


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#10 Gator Bob

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Posted 10 June 2015 - 09:39 AM

After tacking using flux... there might be corrosion between those two steel parts that will impede proper flow later. 

 

Jus' sayin'...


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#11 Bill from NH

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Posted 10 June 2015 - 09:57 AM

To get the face of your crossfeed angle tool closer to the sanding disk, screw or use double-sided tape to attach a wooden fence to the face.


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#12 Pablo

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Posted 10 June 2015 - 10:04 AM

Good idea, Bill. :)  But I made out OK eyeballing it:

 

IMG_5340.JPG

 

I made the tip of the "V" end well enough short of the pan to preclude it from hindering movement:

 

IMG_5331.JPG

 

Bob, are you rushing me? Won't work.  :laugh2:


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#13 Bill from NH

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Posted 10 June 2015 - 11:30 AM

If tacked joints are washed in a baking soda and water solution, then dried, you won't have to worry about corrosion forming.

 

Of course you could pre-tin the parts, too.   :)


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#14 Pablo

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Posted 10 June 2015 - 11:46 AM

As luck would have it, the very tips of the rails end at the rearmost point of the TM forks, so I marked it and got the tongue out of the way:

 

IMG_5344.JPG

 

Time to make the rail bends perfectly aligned with the bracket sides:

 

IMG_5346.JPG

 

Rails tacked together at the tip:

 

IMG_5350.JPG

 

Flopped it over to avoid the tacked solder bump, and checked for absolute flatness:

 

IMG_5351.JPG

 

The easiest way I found to tack the rails to the tongue with everything in position was to do it upside down, and elevate the rails .063" to compensate for the .032" pan and .032" Slick 7 tongue. The fact that a piece of 3/16" OD tubing fit the Slick 7 hole, centered it in the jig, and was in a perfect spot for the rails to butt up against, was pure dumb luck.   :dance3:

 

IMG_5362.JPG

 

Flopped it right side up and tacked rails to bracket:

 

IMG_5378.JPG

 

Center section is flat and perfectly aligned. Now it's a simple matter of finalizing the solder joints. At least, it should be simple, if I don't botch it.  :dash2: :laugh2:

 

IMG_5383.JPG


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#15 dc-65x

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Posted 10 June 2015 - 11:48 AM

I love the motor bracket with the "Pablo" plaque; it looks like jewelry!


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#16 Pablo

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Posted 11 June 2015 - 02:50 AM

Thanks, Rick.  :D  The trophy shop computer engraving machine has much better handwriting than I do.  :laugh2:

 

Lots of alligator clips, Stay-Clean® flux, a little minitorch heat, and the tongue assembly is complete.

 

IMG_5393.JPG

 

IMG_5408.JPG

 

Time to finish the rail to bracket solder joints, and install strength / redundancy bracing...


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#17 Danny Zona

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Posted 11 June 2015 - 10:20 AM

I love watching Pablo's builds.
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#18 Pablo

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Posted 11 June 2015 - 12:19 PM

Thanks, Danny. Last night at Greg Gilberts place I told him about SB I, II, and III. 

He showed me a chassis he built a few years ago with a torsion tongue and dual rail sets just like SB II. :yes3:

 

Rail to bracket joints finalized, excess trimmed and tinned. I sanded the excess solder off because I need a clean nest for redundancy wires:

 

IMG_5423.JPG


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#19 Bill from NH

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Posted 11 June 2015 - 01:00 PM

"Real scratchbuilders don't sand their solder joints." -  the Vitter   :laugh2:  :laugh2:  :laugh2:


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#20 Pablo

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Posted 11 June 2015 - 01:42 PM

:laugh2:  "He can't be a man 'cause he doesn't smoke the same cigarettes as me" – Mick Jagger.  :laugh2:

 

12 degree .063" pyramid as a tongue strengthener and adds low weight in (hopefully) the right place:

 

IMG_5425.JPG

 

IMG_5432.JPG


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#21 Pablo

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Posted 11 June 2015 - 05:15 PM

"Trust, but verify." :)

 

IMG_5447.JPG

 

I was 100% sure the angle on Duffy's masterpiece would be perfect. But I checked it anyway for your viewing pleasure. Absolutely perfect, a slight upward tilt. :good:


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#22 Pablo

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Posted 12 June 2015 - 08:54 AM

I has been brought to my attention that this chassis wouldn't be IRRA® legal due to the steel tongue connector piece.

 

So there will be a slight intermission while I:

 

1) Get my head screwed on straight.  :dash2:

2) Change to a brass connector.  :D

 

Onward!  :to_become_senile:


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#23 Pablo

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Posted 12 June 2015 - 07:20 PM

Modified R-Geo brass tongue connector meets Mr. Turning Man tongue.

  :)

IMG_5466.JPG

 

IMG_5478.JPG

 

Bracket bracing is done:

 

IMG_5491.JPG


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#24 SlotStox#53

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Posted 12 June 2015 - 07:48 PM

Nice.  :good: if it isn't the period korrect police it's the Retro police.  :laugh2:

Cool build, Pabl !



#25 Pablo

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Posted 13 June 2015 - 01:10 PM

Thanks, Paul. Dennis Samson caught my error, and I owe him a big favor for not waiting until I finished it before telling me.  :laugh2:

I'm not sure what size this square tubing is, but it's .155" tall. About a 1-3/8" long piece of it will be notched and soldered to the top of the pan to control movement, and to reinforce the pan in the "V" rails cut-out area.

 

IMG_5496.JPG

I calculated my cut at .047" down from the top of the tube for about 12 thou up/down and .500" wide for 10 thou wiggle per side.
Basically the same as SB I, 15 thou up/down, 20 thou left/right.

 

Heck, Bunky, stop fiddling with that slide rule and just cut a notch in it, OK? :laugh2:

 

Bunky.jpg
 


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