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2017 Exothermic Thingie


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#26 Pablo

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Posted 14 October 2017 - 07:09 PM

Thanks, Paul :)

 

https://www.tamiyausa.com/


Paul Wolcott




#27 Pablo

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Posted 14 October 2017 - 07:26 PM

Jet flag is trimmed, blueprinted, and faced.

Cobra tongue trimmed to fit the flag, polished, marked, and faced.

 

All jiggied up, Pappy. My calculations say the 17.36 mm front wheels will give .032 clearance with the bottom of the .078 dummy axle elevated .301"

 

IMG_7289.JPG


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#28 Pablo

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Posted 14 October 2017 - 09:31 PM

This chassis is going to be all jaildoor, no pans, so I made my tongue nest from 1/16 rod instead of sheet.

Width will be trimmed .925" to match the motor bracket and length will be 1 1/8".

 

Slathered the rods in acid, lined 'em up square, sprinkled a bunch of .032 solder pieces on top,

and hit it with the minitorch. Piece of cake :D

 

IMG_7294.JPG

 

IMG_7297.JPG


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#29 Gator Bob

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Posted 14 October 2017 - 10:24 PM

 

Clean your glasses and look harder - in my photos you can clearly see the wheels have a recess for O-rings.

 

  :dash2:

 

Clean your glasses to see the word most.....in my post.   :shok:  

 

I can see clearly now.   :dance3:

 

Most are "O" Ringless....  

https://www.ebay.com...Roller&_sacat=0


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                            Bob Israelite

#30 Pablo

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Posted 15 October 2017 - 02:49 AM

OK, so they make wheels without O-rings. What does that have to do with my build?


Paul Wolcott

#31 Gator Bob

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Posted 15 October 2017 - 09:57 AM

I'm just sitting here watching the wheels go round and round  :icon22:
I really love to watch them roll :to_become_senile:


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#32 Jairus

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Posted 15 October 2017 - 04:33 PM

Just ignore Bob there Paul.
He is probably thinking of your jig wheels and failed to pay ATTENTION  to post #10!


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#33 Gator Bob

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Posted 15 October 2017 - 05:13 PM

Just ignore Bob there Paul.
He is probably thinking of your jig wheels and failed to pay ATTENTION  to post #10!

 

Sorry ...No, you're wrong.

It was the O rings I saw in #6 and #9.

That lead me to an ebay search of "ball race" and those results are shown in post #29.

Did you fail to open that ebay link to SEE for yourself?

 

"MOST listed do not have ...."  Jarius, read post #22 for the rest. 

 

(hmm..why am I even explaining myself?)


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#34 Pablo

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Posted 15 October 2017 - 08:11 PM

Front chunk/tongue done, flat, square, .925 wide, with some tilt

 

IMG_7299.JPG

 

 


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#35 Pablo

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Posted 15 October 2017 - 08:56 PM

1/16 main rails

 

IMG_7312.JPG


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#36 Pablo

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Posted 16 October 2017 - 06:38 PM

Ultimately the front axle will only be attached to the ISO'ed rails.

But for now I tacked a pair of dummy (temporary) .055 uprights from the main section to the axle.

This will allow me to remove the big jig screws, and keep everything in place until I'm ready to let it float free :)

 

IMG_7313.JPG


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#37 Pablo

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Posted 17 October 2017 - 02:44 PM

First set of ISO rails, spaced .015 from brass main rail and attached to front axle.

 

IMG_7321.JPG

 

ISO hinge wire set with .063 keeper

 

IMG_7322.JPG


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#38 Pablo

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Posted 17 October 2017 - 07:05 PM

.039 wire cross connector

 

IMG_7325.JPG

 

Uprights are a combination of .055 and .047 wire

 

IMG_7328.JPG


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#39 Pablo

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Posted 17 October 2017 - 08:30 PM

Uprights trimmed; dummy uprights removed

 

IMG_7331.JPG


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#40 Pablo

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Posted 18 October 2017 - 06:02 PM

ISO rail cross connectors. The center one is .055 wire and will double as a bite bar for tilting body mounts

 

IMG_7334.JPG


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#41 Pablo

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Posted 18 October 2017 - 08:09 PM

Downstop allows about 15 thou ISO drop. It doesn't take much to make it work it's magic.

Bite bar(s) bent slightly upwards to allow lift for the 1/16 rod body mounts.

1/16 hinge tubes installed

 

IMG_7336.JPG

 

Time for a (preliminary) Brillo Pad bath :)

 

IMG_6342.JPG

 

 


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#42 Maximo

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Posted 20 October 2017 - 12:49 PM

Pablo,

The 2mm axle that you are using, who makes it and how long is it?

Thanks!


-maXimo
David Ray Siller
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Thingies are my thingie!

#43 Pablo

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Posted 20 October 2017 - 03:13 PM

2 mm axles are not hard to find; racers use them all the time.

I got mine at PCH and it comes in 10" lengths.

 

BUT, I don't think you need it unless you are using them for rear axles in modern competition cars.

-it's impossible to tin and solder to

-in a hard hit it will either snap or transfer the damage to the uprights instead of bend

-.078 piano wire is plenty close enough to 2 mm to make a perfect fit for the Tamiya wheels, it's much cheaper, it tins, solders, and bends

-it's so close, they don't even sell 2 mm spacers to my knowledge - racers just use arm spacers on them.

 

Why did I use them on this build as both a dummy axle, and an axle?

Because I forgot I used .078 on the Pinner, and brain farted.

Normally this wouldn't have happened but I didn't do a build thread on the Pinner :pardon:

In fact, halfway through the build I had to discard both the dummy and the front axle and swap to .078 :dash2: :curtsey:


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#44 Maximo

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Posted 20 October 2017 - 06:25 PM


Pablo,

Thank you greatly for this information. It helps my planning tremendously as I love the 17mm Tamiya style ball bearing wheels as you know.


-maximo
David Ray Siller
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Thingies are my thingie!

#45 Bill from NH

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Posted 20 October 2017 - 07:53 PM

Last I knew, 2mm rear axles were only used in the eurosport cars. Now they may be legal in other classes too.

 

If you need wheel keepers & spacers for .078 piano wire, use 1/8" brass rod cut to length & drilled .078.


Bill Fernald
 

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#46 Pablo

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Posted 22 October 2017 - 07:27 PM

If you need wheel keepers & spacers for .078 piano wire, use 1/8" brass rod cut to length & drilled .078.

What's the advantage of doing that instead of simply doing it the way I did it?


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#47 Bill from NH

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Posted 22 October 2017 - 07:55 PM

Since you already got that part done, ignore my post. :good: Last I knew, .078 wire retainers were not commercially available.


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#48 Pablo

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Posted 22 October 2017 - 08:08 PM

I guess you missed my post #9. Arm spacers work perfectly and are readily available.

This is what the guys who use 2 mm rear axles use for spacers.


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#49 havlicek

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Posted 23 October 2017 - 06:07 AM

Last I knew, 2mm rear axles were only used in the eurosport cars. Now they may be legal in other classes too.

 

If you need wheel keepers & spacers for .078 piano wire, use 1/8" brass rod cut to length & drilled .078.


After which, doing an internship as a brain surgeon would be a snap!  (just kidding Bill...pretty much anyway  :D  )


John Havlicek

#50 Bill from NH

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Posted 23 October 2017 - 07:56 AM

John, not if you have a lathe. :laugh2:

 

Thin pieces stacked to make a rotating mass introduces harmonic vibrations.


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