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Cox Engine of The Month
February-2019
balogh's

"Black Lynx .049 with a Throttle, Exhaust Deflector and Nelson-Galbreath head set"



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Cox Pinto Funny car fix up

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Cox Pinto Funny car fix up

Post  rsv1cox on Thu Feb 07, 2019 7:58 am

Arrived a couple of weeks ago missing the fuel tank, engine shroud, and with a broken left side axle/suspension and missing wheel which the PO promised to deliver but never did.



The missing fuel tank presented the biggest problem, but Jason to the rescue with his 3D printer.  I sent Jason my calculated dimensions which proved to be quite close and workable, but about a sixteenth" short in length.  Not a problem it's going to work.

I think the capacity is about a quarter of a standard BB 5cc tank which depending on lean out would give about sixty seconds of run time.  More than enough for a simulated quarter mile sprint.  







It's amazing the printer can duplicate that tank right down to the vent and feed nipples.  Thanks Jason, I don't think I could have duplicated that tank to anywhere near the quality or appearance of the original that you achieved.

The broken axle is another matter.

I found some wheels on ebay that will work but the hubs on both types will have to be drilled and/or bushed.  It's fitting the dog leg into the broken plastic that the problem.  I'm thinking bent to match music wire would work.  







Hammer or file the music wire to a flat to help avoid twisting, drill a hole in the plastic about an inch long, insert and epoxy.  Then simulate the reinforcement piece and solder in place.




Original Pinto wheel is pictured bottom right.
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Re: Cox Pinto Funny car fix up

Post  Jason_WI on Thu Feb 07, 2019 11:50 am

Couple of detailed measurements of offset height, diameters, length of axle, and any angles and I think I can create a bolt on axle that would screw to the side frame. I can print it out of grey PLA and with it being bolted on can be replaced if it breaks.


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Re: Cox Pinto Funny car fix up

Post  rsv1cox on Thu Feb 07, 2019 12:12 pm

Jason_WI wrote:Couple of detailed measurements of offset height, diameters, length of axle, and any angles and I think I can create a bolt on axle that would screw to the side frame. I can print it out of grey PLA and with it being bolted on can be replaced if it breaks.



That looks like a winner Jason, only I would suggest rotating the bracket 90 degrees to parallel the frame. Would it be possible to incorporate the 90 degree bracket behind it also.

I made something out of 3/32" music wire that fits the bushed insert on the black tired wheel, but it would work better if the axles shaft fit the wheels hub. I would still have to drill a hole in the main shaft to insert the music wire. Your suggestion is much better.



I can provide measurements.

Bob
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Re: Cox Pinto Funny car fix up

Post  rsv1cox on Thu Feb 07, 2019 12:50 pm

Measurements













Forgot to measure the axle shaft diameter



Original wheel upper left. Replacement wheels with different measurements. Present shaft measures 1/8" which I can work around.

Thanks - Bob

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Re: Cox Pinto Funny car fix up

Post  Jason_WI on Thu Feb 07, 2019 2:59 pm

Whats the diameter of the main axle coming off the side frame? Is that 1/4".

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Re: Cox Pinto Funny car fix up

Post  Mark Diedrichs on Thu Feb 07, 2019 3:22 pm

Check out ebay, item 233125277960. I think you may want these!!! Mark
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Re: Cox Pinto Funny car fix up

Post  Jason_WI on Thu Feb 07, 2019 3:31 pm

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Re: Cox Pinto Funny car fix up

Post  rsv1cox on Thu Feb 07, 2019 3:38 pm

Yes, 1/4" finally found my calipers and checked all measurements.

Thanks Mark and Jason. The last set went for over $40, I didn't want to spend that much for them. I don't know if they sold or not, these might be the same ones....

Bob
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Re: Cox Pinto Funny car fix up

Post  Jason_WI on Thu Feb 07, 2019 3:53 pm

What’s the height of that 1/4” axle from top to bottom? Is it also 5/8” same as the distance of the frame?
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Re: Cox Pinto Funny car fix up

Post  Kim on Thu Feb 07, 2019 3:55 pm

This stuff is freaky cool !!!!
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Re: Cox Pinto Funny car fix up

Post  NEW222 on Thu Feb 07, 2019 4:47 pm

Thanks for sharing your latest venture with us again Bob. I can't wait till I get hme to read up what was happening in your fix-it-up world every day. It is one of teh things I look forward to daily. And again, thanks for taking the time to share and document your progress as it goes along.
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Re: Cox Pinto Funny car fix up

Post  NEW222 on Thu Feb 07, 2019 4:50 pm

I agree Kim. I am thankful for those here that take the time to show off their toys in both good condition and in desperate need of repair. As well for those that bring life back into these toys of days past, I appreciate their time and efforts showing us their repairs and ideas along the way. Also to this all teh friendly and helpful advice of others here when someone asks for help or ideas. Lastly, it is great to have those here that are great with technology and willing to help others out in these times. It is things like this that truly, in my opinion, make this simply the best forum to be a member of, and I for one am proud to be here!
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Re: Cox Pinto Funny car fix up

Post  rsv1cox on Thu Feb 07, 2019 5:08 pm

]
Jason_WI wrote:What’s the height of that 1/4” axle from top to bottom? Is it also 5/8” same as the distance of the frame?

Yes, 5/8" if I'm reading you correctly.  Maybe this will help.

Whoops, something wong.....My pictures disappeared.  Gotta find them......

Second try... Sad








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Re: Cox Pinto Funny car fix up

Post  rsv1cox on Thu Feb 07, 2019 5:19 pm

NEW222 wrote:Thanks for sharing your latest venture with us again Bob. I can't wait till I get hme to read up what was happening in your fix-it-up world every day. It is one of teh things I look forward to daily. And again, thanks for taking the time to share and document your progress as it goes along.

Thanks Chancey, sometimes I think I'm just taking up space.

I tell you, Jason has been a big, big factor in all these endeavors.

Bob
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Re: Cox Pinto Funny car fix up

Post  SteveM on Thu Feb 07, 2019 6:47 pm

Kim wrote:This stuff is freaky cool !!!!


You betcha! Very Happy
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Re: Cox Pinto Funny car fix up

Post  Cribbs74 on Thu Feb 07, 2019 7:53 pm

rsv1cox wrote:
NEW222 wrote:Thanks for sharing your latest venture with us again Bob. I can't wait till I get hme to read up what was happening in your fix-it-up world every day. It is one of teh things I look forward to daily. And again, thanks for taking the time to share and document your progress as it goes along.

Thanks Chancey, sometimes I think I'm just taking up space.

I tell you, Jason has been a big, big factor in all these endeavors.

Bob

More than you know Bob...
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Re: Cox Pinto Funny car fix up

Post  Jason_WI on Fri Feb 08, 2019 7:24 pm

I did the best I could with the TinkerCAD shape generators. It doesn't have S shaped tube generators so I had to cut and paste things together. It should print fine and hold together well. I may extend the side plate towards the front at an angle to match the frame. It could be glued in place or screwed in place. Its easy to mirror parts so I made left and right sides. This is 1/8" axle and I will make one with 3/16" and 3/32" for the wheels that are on hand.


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Re: Cox Pinto Funny car fix up

Post  Jason_WI on Fri Feb 08, 2019 7:50 pm

I added more support for glue or screws. Can be sanded to fit better as I guessed at the angles for the side plates. Off to the printer with it.


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Re: Cox Pinto Funny car fix up

Post  NEW222 on Fri Feb 08, 2019 8:40 pm

Wow Jason. I am still amazed by what one can do with one of those printers, however, knowing how to use it, like yourself, is the other thing.
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Re: Cox Pinto Funny car fix up

Post  Jason_WI on Fri Feb 08, 2019 11:30 pm

Fresh off the printer.


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Re: Cox Pinto Funny car fix up

Post  rsv1cox on Sat Feb 09, 2019 6:51 am

A prosthetic arm for the Funny Car. How great is that! Thanks Jason.

I see you built the frame angle into the piece, a measurement that I failed to give you. Looks like about 25/30 degrees?



All those McMaster-Carr buys I have made over the years come in handy. I think three nicely placed 3/48X1/2" will hold it fine. Maybe 4/40's. We will see.



Bob
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Re: Cox Pinto Funny car fix up

Post  Jason_WI on Mon Feb 18, 2019 5:47 pm

In preparation in printing in nylon I have 3/32", 1/8" and 3/16" axle sizes for the different wheels you have. I also mirrored them so you have left and right sides. Added two .096 holes. If you want the holes moved or removed let me know. I shortened the front portion that mounts to the frame as It would have been too long possibly hung over.


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Re: Cox Pinto Funny car fix up

Post  rsv1cox on Tue Feb 19, 2019 8:43 am

Over and above the call Jason. I appreciate it.

Holes as is are fine.

Bob
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Re: Cox Pinto Funny car fix up

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