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Author Topic: Bushing tpi  (Read 255 times)

pipedreamer65

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Bushing tpi
« on: March 12, 2019, 03:54:46 PM »
Anyone know the bushing tpi for naval water cap fuse?  The outer that screws into the shell.

Tia

CarlS

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Re: Bushing tpi
« Reply #1 on: March 13, 2019, 12:16:51 AM »
I just looked in Chuck Jones's fuse book and I see that the bushing for the Parrott is 12TPI (Page 12).  But oddly it doesn't indicate what the standard ball bushing had for it's outer threads.  I'm sure someone else here knows.  If not I'll take one to work and check it with a thread gauge to see.
Best,
Carl

pipedreamer65

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Re: Bushing tpi
« Reply #2 on: March 13, 2019, 06:48:23 AM »
Thank you Carl, we will see if anyone else has something to add.

emike123

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Re: Bushing tpi
« Reply #3 on: March 13, 2019, 09:01:23 AM »
I don't have a metric thread gauge, just a US one, but 14tpi looks right to me. 

CarlS

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Re: Bushing tpi
« Reply #4 on: March 14, 2019, 04:54:54 AM »
I'll take one to work and get a machinist to tell me.
Best,
Carl

CarlS

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Re: Bushing tpi
« Reply #5 on: March 14, 2019, 12:10:37 PM »
I had a machinist look at a good bushing in my collection and he determined it was 1 5/16" (1.3125") outside diameter with 14 TPI.  He did remark that the 14TPI wasn't a perfect fit likely due to the time period it was made but he compared with both metric and standard thread gauges.  This is in line with Mike and also Jack Bell's table where he describes the bushing as having a 1 1/3" (1.333") outside diameter with 14TPI.
« Last Edit: March 16, 2019, 08:57:29 AM by CarlS »
Best,
Carl

pipedreamer65

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Re: Bushing tpi
« Reply #6 on: March 15, 2019, 09:55:13 AM »
You guys are the best.  Thank you so much.  Pipe