Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Builds, Repairs, Show Your Machines! => Technical Tips, Builds, and Help => Topic started by: Steamburns on March 05, 2024, 02:08:33 pm

Title: Re: Doll pressure gauge thread count?
Post by: Hassellbear 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.

Happy Steaming!

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Title: Re: Doll pressure gauge thread count?
Post by: Woe is me on March 07, 2024, 01:38:36 pm: Make sure it has metric gauges.
Title: Re: Doll pressure gauge thread count?
Post by: Steamburns 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.
Title: Re: Doll pressure gauge thread count?
Post by: Stoker on March 05, 2024, 02:23:35 pm: Yeah, get a thread gauge.
Title: Doll pressure gauge thread count?
Post by: Steamburns 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