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Post  Rosco Wed Dec 30, 2020 4:19 pm

Hi all, I just acquired a cox thimble drome special 045 tether car. Its missing the front axle,rims and tires. The front axle thread size is my question. It looks like an 8-32 thread on the axle from another car but its not. Can someone tell me what size die they used on the axle ends. All the pusher cars have some type of rivet fastener to hold the wheels on.
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Post  crankbndr Wed Dec 30, 2020 5:08 pm

I have one I will pull a nut and see if I can figure it out. You say you have eliminated 8 -32? That would have been my guess. They have a funny nut also.

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Post  Rosco Wed Dec 30, 2020 5:42 pm

Roger that on the nuts. I have the two axle nuts from another car and they go about one turn on the 8-32 thread. I ordered an 1/8-40 die, Received it today, and that doesn't seem to work either. I have some 3/16 round stock to make an axle. Just trying to keep her stock. By the way Beautiful car!
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Post  crankbndr Wed Dec 30, 2020 5:48 pm

well it is an 8 and not 32, that leaves 8-36 or 8-24. I think 8-24 but have nothing now that size to try. I'll find and 8-24 tomorrow and try it.
Thanks I restored it a few years ago and one of my favorites.
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Post  crankbndr Wed Dec 30, 2020 9:15 pm

I guess 8-24 doesn’t exist or oddball, I’m stumped.
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Post  Cribbs74 Thu Dec 31, 2020 3:15 am

Do you guys have a pitch gauge? They usually reside in good tap and die sets.
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Post  getback Thu Dec 31, 2020 5:29 am

there is a 8-32 and 8-36 but i can only find them in crown and low stgth machine sc. nuts https://www.mcmaster.com/crown-nuts/low-strength-steel-cap-nuts-9/  I don' know what that nut on Cranks car is called ? Beers  Look Here but metric https://www.mcmaster.com/machine-screw-nuts/ scroll to bottom    Cox special 045 tether car question 90441a10
Happy New Year


Last edited by getback on Thu Dec 31, 2020 5:37 am; edited 2 times in total (Reason for editing : Wheeeee)
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Post  crankbndr Thu Dec 31, 2020 6:04 am

Cribbs74 wrote:Do you guys have a pitch gauge? They usually reside in good tap and die sets.


I got one somewhere, don't know why i can't find anything. I almost dropped the nut into the abyss under my bench.


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Post  crankbndr Thu Dec 31, 2020 7:20 am

The major diameter is .161" I would try 8-36 next but have no tap that size. The problem with a pitch gauge is only two threads on the end of axle and my eyes aint that good anymore.
They were made in 1950.
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Post  Rosco Thu Dec 31, 2020 8:33 am

Thanks for checking. The 0ne size I haven't tried is an 8-36. Don't have that die. I did try some metric dies and ran into the same situation. Like you said there's only 2 threads so it's hard to pitch gauge it. I'm going to try and order an 8-36 die. I'm not sure what else to try. The wheel are on the car now with the 8-32 threads. I screwed on the stock nuts until they stopped hand tight. I could leave it like that but not my work ethic. Hard to find some of the parts for these cars.
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Post  Davenz13 Fri Jan 01, 2021 3:24 am

I took the front axle out of my Cox Special and took the following measurements
     
Axle overall length       4.52”
Between axle nuts*     4.32"
Axle dia                     3/16”  
Thread dia           0.1633"  
Threads per inch  36

* axle nuts finger tight

Thread measurement of No 8 UNF from Engineers Black Book. Very handy book

Cox special 045 tether car question Engine10

      Tpi             major                  effective            minor          minor      Tapping                clearance
                        Dia                     dia                    dia            Ext dia     int drill size mm   drill size mm

No 8 36            0.1640            0.1460              0.1299       0.1339      3.50                 4.30

Looking at those measurements I think you’re on the right track Rosco,  No 8 -36 UNF.

Also, the Prop Rod had the same setup before they went to the horseshoe circlip.

Cox special 045 tether car question Prop_r10

The bonus is the front axle is about 5¼” long so can be cut down to suit.
The part number for the hub nuts is 910 (pkt of 4).

Cox special 045 tether car question Prop_r13
Cox special 045 tether car question Prop_r11

Keep an eye out for them or a Prop Rod chassis, they turn up occasionally.

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Post  Rosco Fri Jan 01, 2021 9:50 am

Thank you crankbndr and devenz For all your all your great Help. I didn't have too many choices left on die size. I ordered the 8-36 yesterday. Think i"ll order the tap today. I have a prop rod axle but I didn"t want to cut it so I purchased the 3/16" stock. Now I can make lots of axles! I do enjoy working on these cars. Can't afford top shelf ones. Have to make them that way. You all try to have a great new year! Thank you.
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Post  Rosco Fri Jan 01, 2021 4:22 pm

Here's A pic. of my 045. I received mine with A bare patina. Most I see are colored. I polished it up. Has someone along the way removed the paint?  .Cox special 045 tether car question Kimg0013
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Post  crankbndr Fri Jan 01, 2021 6:54 pm

That model looks good polished, don't know if they came that way. Every time I make a definitive statement about Cox I am usually wrong. Beer Cheers
I enjoy fixing them up also and don't care if not factory. Sometimes an old beater is worth fixing up for my shelf queen collection. I don't run em.
Welcome to the party pal!!  lol!

I did a Champion also,
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Post  Rosco Sat Jan 02, 2021 9:05 am

Beautiful job! Looks great. Waiting on new tires, Brake lever and exhaust for the Special. Supposed to Arrive today. This will be no. ten in my car collection. I have to quit buying them dont have anymore shelf space.Will see how long that lasts.Cox special 045 tether car question Kimg0015
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Post  crankbndr Sat Jan 02, 2021 11:26 am

Good we can still find parts either repro or new old stock. I have bought more than one model just to get parts to make one complete.
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Post  Rosco Sat Jan 02, 2021 5:00 pm

Thanks Getback for the Mcmaster linc. I ordered the metric 3mm round slotted nuts. Hopefully I can run an 8-36 tap through them so I can put my Prop Rod front axle back together. I used the axle nuts on the 045 special.
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