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GE Machine screw type?  Rate Topic 
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 Posted: Tue Jul 11th, 2017 09:45 am
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Fred Frederiksen
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I have run into a problem of trying to find what thread type GE used in the 1930's for the stator?  I have not been able to find the correct thread. Did they use a British type machine screw or something else? I have attached a picture of a small GE stator. Could anyone please tell me where to find the correct fitting screw?

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Mike 001.JPG

Last edited on Tue Jul 11th, 2017 09:46 am by Fred Frederiksen

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 Posted: Tue Jul 11th, 2017 10:05 am
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Lane Shirey
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No, it's a US thread, but they used some oddball thread pitches. If I recall it's between 24 and 32 pitch. Might be 28 if I recall. I don't know if you'll find screws anymore with that pitch. You might need to use a piece of wood and a hammer to tap the stator back in. 

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 Posted: Tue Jul 11th, 2017 01:24 pm
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Fred Frederiksen
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Lane, that answers my question, thank you once again. So what do others do if they need a screw to replace one of the originals?

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 Posted: Tue Jul 11th, 2017 02:06 pm
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Lamar Bass
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I always heard G.E. made there own screws, Fred.

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 Posted: Tue Jul 11th, 2017 02:24 pm
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Steve Butler
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I'm just glad to know I'm not the only guy that couldn't figure out what thread the screws are. :hammer:

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 Posted: Tue Jul 11th, 2017 02:31 pm
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Steve Rockwell
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     Fred, the actual dimensions will vary model to model... what model# fan are you working on?

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 Posted: Tue Jul 11th, 2017 07:43 pm
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Fred Frederiksen
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Steve, it's a GE No. 55x165 (Vortalex) fan. Spec: 272508-1

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 Posted: Tue Jul 11th, 2017 08:03 pm
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Fred Frederiksen
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You say GE makes their own screws...are you talking back in the early 1930's?

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 Posted: Tue Jul 11th, 2017 11:57 pm
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Lane Shirey
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Actually, one of two things could apply. 

1) manufacturers made parts unique to their product, so you'd have to buy their replacement parts, or, 
2) there were screw threads available in antiquity that no longer exist due to consolidation in modern times.  


In either case, GE has different threads on some models. I've had to buy 10-28 taps and dies to chase threads on certain old fans. 

Best advice is to go to the local hardware store and buy a variety of nuts and bolts, even if only one of each to use for testing.  Buy a cheap divided container from Harbor Freight. Mark the compartments to keep track of the sizes and threads and then use them to figure out what fits what. If nothing fits, you have an oddball thread and you likely have no option but to find parts from another fan or have them custom made. Darryl Hudson and Ted Kazor both make custom screws. They make cool sizing gauges, but they often don't have all the sizes you will want and cost $$$ more than a handful of screws from Ace. 

All the best!

Last edited on Wed Jul 12th, 2017 12:10 am by Lane Shirey

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 Posted: Wed Jul 12th, 2017 03:58 am
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Fred Frederiksen
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Thank you lane, will do!

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 Posted: Wed Jul 12th, 2017 12:29 pm
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Michael Rathberger
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Get a thread guage. Mine has about 10-12 different pitches, including 28. They cost about $5.00, a nice tool for the tool box, hasn't let me down yet. I also purchased a set of taps and dies from an old tool maker auction, it has had every screw size and pitch for every fan I've ever worked on, the whole set cost me $30.00. The best thing about them is they're organized in neat little wood boxes, basically a lifetime collection.

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 Posted: Wed Jul 12th, 2017 07:51 pm
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Fred Frederiksen
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Michael, you are very lucky to have such a complete die set. I decided to re-tap and use a standard thread and see how that goes. I am still amazed about the confusion this brings to someone trying to restore the correct way.


Thank you for your information.
Fred

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 Posted: Wed Jul 12th, 2017 10:15 pm
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Fred Frederiksen
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Michael, for the very first time I used a tap & die set to get a standard size thread and to my amazement, it worked!!!  I did not know that my late father-in-law had a very old set which I inherited. I found it and everything went as planned. I now can work on those odd-ball threads.


Fred

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 Posted: Thu Jul 13th, 2017 12:27 am
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Steve Rockwell
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     Fred, you will need 6-40 x 7/8". Are you certain it is Vortalex ("super-quiet") blade, not "quiet" blade? I'm asking because of that early spec. number...

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 Posted: Thu Jul 13th, 2017 12:38 am
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Steve Rockwell
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AY-186







or AY-313




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 Posted: Thu Jul 13th, 2017 12:42 am
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Steve Rockwell
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For any Moderator---  Could this thread kindly be moved to pre-1950?

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 Posted: Thu Jul 13th, 2017 04:57 pm
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Steve Rockwell
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This is the Fastenal listing. An uncommon size, but there are choices, other sources.



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 Posted: Fri Jul 14th, 2017 02:14 am
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Fred Frederiksen
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Thanks Steve.....

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