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Author Topic: Doll pressure gauge thread count?  (Read 436 times)

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Doll pressure gauge thread count?
« on: March 05, 2024, 02:08:33 pm »
The pressure gauge on this Doll 364 broke.   Does anyone know how I can find out all the thread sizes for all nuts and bolts on this 364/1

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Re: Doll pressure gauge thread count?
« Reply #1 on: March 05, 2024, 02:23:35 pm »
Yeah, get a thread gauge.
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Re: Doll pressure gauge thread count?
« Reply #2 on: March 05, 2024, 03:21:15 pm »
Quote from: Stoker on March 05, 2024, 02:23:35 pm
Yeah, get a thread gauge.

Probably a good idea.

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Re: Doll pressure gauge thread count?
« Reply #3 on: March 07, 2024, 01:38:36 pm »
Make sure it has metric gauges.
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Tommy

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Re: Doll pressure gauge thread count?
« Reply #4 on: March 26, 2024, 03:41:44 pm »
If the tread pitch/spacing doesn't match either a SAE or metric thread gauge, you could measure the thread pitch and thread angle using an optical comparator and the thread major and minor diameters using a caliper. Then, hopefully, you can determine what you have using thread charts. This is how I determined the flywheel set screw on my Doll 365/1 is 1/8 x 40 BSW. For measuring pitch, you can mark the threads with a pencil and then press them into a sheet of paper. Then you can measure using the comparator on the flat, transferred thread pattern.

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