AC 1927 speedometer

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Michel
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Joined: Sun Aug 11, 2019 12:25 am
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Last Name: VIN
Location: La Baule FRANCE

AC 1927 speedometer

Post by Michel » Sun Aug 11, 2019 12:39 am

I lost my teethes !!!!

Does anyone has a picture of the 1927 AC speedometer system on the wheel when complete ?

What material is this ?

And a way to retrieve, buy, or re-manufacture such spare part ?
2019-08-09_vitesse2.jpg
2019-08-09_vitesse3.jpg
2019-08-09_vitesse4.jpg
2019-08-09_vitesse1.jpg
car is a January 1927 Model T Touring with wire wheels option (named "Poupette")
2019-07-31_Poupette.jpg

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Mark Gregush
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Re: AC 1927 speedometer

Post by Mark Gregush » Sun Aug 11, 2019 1:15 am

The gear is fiber and is missing it's teeth. The driving gear on the wheel is very worn. I think that if you tried to mate a new driven gear it will wear the teeth very quickly. The piece that fits on the wheel is somewhat common in the US, the fiber gear not so much.
I know the voices aren't real but damn they have some good ideas! :shock:

1921 Huckster
1925 Cut down pickup


Topic author
Michel
Posts: 6
Joined: Sun Aug 11, 2019 12:25 am
First Name: Michel
Last Name: VIN
Location: La Baule FRANCE

Re: AC 1927 speedometer

Post by Michel » Sun Aug 11, 2019 1:49 am

Thanks Mark for your expertise,
Following your advise that looks perfectly adequate I have purchased a new set of the piece that fits in the wheel, on eBay, now, should receive it home this week, and now needs to find a new gear or a way to make it ....

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Mark Gregush
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Re: AC 1927 speedometer

Post by Mark Gregush » Sun Aug 11, 2019 11:27 am

There were 2 different tooth counts on the fiber driven gear, 20 teeth for 30" high pressure (clinchers) and 21 for 21" low pressure(wire) wheels. The one shown in the photo is the 20 tooth type. My OP; the 20 tooth might put you more in the ball park of a correct reading (the one in the photo is not for sale at this time) because of the over sized tires commonly sold today being closer to having an outside diameter of approx 30" US. The driving gear on the wheel is the same for both types of driven gear, having 30 rectangular holes.
There are two types of the gears that mounts to the wheel; one with 3 mounting holes and one with 4. The one with 4 to be used with the wire or wood wheels.
Attachments
DSCF7127.JPG
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I know the voices aren't real but damn they have some good ideas! :shock:

1921 Huckster
1925 Cut down pickup


Topic author
Michel
Posts: 6
Joined: Sun Aug 11, 2019 12:25 am
First Name: Michel
Last Name: VIN
Location: La Baule FRANCE

Re: AC 1927 speedometer

Post by Michel » Sun Aug 11, 2019 12:10 pm

Thanks for your very clear details and the 3 pictures

Today I have found that a "Speedo Driven Gear-T-17260-FG" 12 teeth fits well in the wheel gear so I can probably attach it on my "without teeth" fiber driven gear and then have km and km/h instead of miles and mph ... why not ?
2019-08-11_pignon2.jpg
2019-08-11_pignon1.jpg
Last edited by Michel on Sun Aug 11, 2019 1:05 pm, edited 1 time in total.

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Mark Gregush
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Re: AC 1927 speedometer

Post by Mark Gregush » Sun Aug 11, 2019 12:59 pm

Even if you can get the gear shown dished to the proper angle, the teeth count is way off and may not fit the spacing of the holes in the wheel gear. In the event you can get that far, the construction used in making the gear, the teeth may just sheer off. But heck, give it a try. ;)
https://www.ebay.com/itm/Model-T-Ford-A ... 1839663355
I know the voices aren't real but damn they have some good ideas! :shock:

1921 Huckster
1925 Cut down pickup


Topic author
Michel
Posts: 6
Joined: Sun Aug 11, 2019 12:25 am
First Name: Michel
Last Name: VIN
Location: La Baule FRANCE

Re: AC 1927 speedometer

Post by Michel » Sun Aug 11, 2019 1:28 pm

Thanks so much Mark. I have purchased the "Model T Ford AC Speedometer Drive and Cable MT-3254" on eBay and will try the 2 solutions, either adapt the modern 12 teeth gear at receipt of the new wheel gear, and have the possibility to come back to an original AC gear when receiving it (estimated = Sept 3rd)

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RajoRacer
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Re: AC 1927 speedometer

Post by RajoRacer » Sun Aug 11, 2019 3:45 pm

That 12 tooth gear you have shown in your photo is for a Ford Special speedometer - won't likely work no matter how you modify it.

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