Need a gear made

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ScaleCraft
Posts: 6693
Joined: Thu Jan 26, 2012 10:15 pm

Need a gear made

Postby ScaleCraft » Thu Aug 19, 2021 1:58 pm

We finally got the failed original back for a sample.

Prefer steel, not aluminum as original.

MTH copy of pre-war Flyer Standard Gauge, 4695 4-4-2.
I have sample and photos. Has a hub for pressing onto shaft. Spur drive, like Lionel steam was.

large gear is approximately 1-7/16” diameter and has 50 teeth.
Any idea where to go?

Thanks
Dave....gone by invitation

bob turner
Posts: 13647
Joined: Sat Jan 13, 2007 7:57 pm

Re: Need a gear made

Postby bob turner » Thu Aug 19, 2021 7:42 pm

I know nothing about gear hobbing, but I would look for a hobbyist with a gear hobbing attachment. Or maybe buy one for a friend with a lathe.

Older train gears are standard parts, and for lots of $ Boston Gear will probably sell you one.

Raoul at NWSL was known to make a special gear now and then.

bob turner
Posts: 13647
Joined: Sat Jan 13, 2007 7:57 pm

Re: Need a gear made

Postby bob turner » Thu Aug 19, 2021 9:32 pm

I found this tedious, but all the info is there. Three parts.
Google "gear hobbing"

https://m.youtube.com/watch?v=7WleHVtIc1c

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R.K. Maroon
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Joined: Tue Feb 22, 2011 9:20 pm

Re: Need a gear made

Postby R.K. Maroon » Thu Aug 19, 2021 11:28 pm

There is a good chance that the gear is indeed standard, but it may be metric.

Dave: I can look into this but need the pitch diameter, which is approximately mid-tooth to mid-tooth. Also, it is important that the gear count is accurate, so double check that if it's not too tedious.

Jim
The link below any photo will display the image full size

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ScaleCraft
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Re: Need a gear made

Postby ScaleCraft » Fri Aug 20, 2021 3:46 pm

working on it. Thanks
Dave....gone by invitation


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