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 Post subject: Pyle-National DFO-3 Plugs Wanted
PostPosted: Thu Feb 17, 2022 9:30 pm 

Joined: Wed Sep 25, 2013 12:36 am
Posts: 594
Location: Anchorage, Alaska
Before I go to the effort of making a few replicas, does anyone have 3 or 4 Pyle-National DFO-3 plugs that are surplus to their needs? Alaska Railroad #557, circa 1944, uses them for cab lighting.


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 Post subject: Re: Pyle-National DFO-3 Plugs Wanted
PostPosted: Sat Apr 09, 2022 12:38 am 

Joined: Wed Sep 25, 2013 12:36 am
Posts: 594
Location: Anchorage, Alaska
No longer needed. I made four replicas.


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 Post subject: Re: Pyle-National DFO-3 Plugs Wanted
PostPosted: Sat Apr 09, 2022 11:53 pm 

Joined: Tue Aug 24, 2004 6:30 am
Posts: 756
Dick_Morris wrote:
No longer needed. I made four replicas.


Cast and machined?


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 Post subject: Re: Pyle-National DFO-3 Plugs Wanted
PostPosted: Fri Apr 15, 2022 9:23 pm 

Joined: Wed Sep 25, 2013 12:36 am
Posts: 594
Location: Anchorage, Alaska
Quote:
Cast and machined?

Yes. They actually aren't quite done. The originals had die cast aluminum cases. I tried to use them as a pattern for sand casting in aluminum but there was no draft and I couldn't do it. Plan B was to 3D print the case pattern with adequate draft and that worked for sand casting. The insulator block was 3D printed using a resin that will withstand over 300 f. The contacts were 3D printed in castable resin and investment cast. The cases are done with the exception of the 1" x 14 tpi threads. I was successful on one but another couple failed and I need to improve my method of holding them to keep them from moving while being threaded. When I get a bit more time I'll get them finished. All in all, an interesting exercise.


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