Boyce MotoMeter Mounting Nuts & Fine Screw Threads

Capt Quahog

Capt Quahog

Senior Member

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Find myself with four Boyce Moto-Meters and just one (1) mounting nut. The threads on these old original Moto-Meters is an oddball size and not easy to find. Somebody mentioned along the way that hardware dedicated for electric lamps may fit. Will need to do more scouting when opportunity permits. In the meantime, does anyone have a source for mounting hardware for these ancient contraptions? Thanks in advance . . .




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Contact them before ordering. Most if not all replacement parts available new (other than face plates) are for the Junior size. I used a brass plumbing fitting for mine, then poured the cap base full of epoxy.
 

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1wonton said:
I made the brass nut for my mm on my screw lathe.
Click to expand...
Wonton,
Are they a common diameter & thread pitch? I had a BIG "Universal" MOTO-METER on Minerva & it already had 2 nuts on it:) I just cleaned it up & it worked PERFECT:D
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Bill W.
 
i cant judge how big they are but like electrical toggle switches have a oddball nut size that may fit. Or lamps like suggested.

do you have a thread gauge you could figure out what size they are? im sure someone in the vast internet someone has some. or if we have a size and a thread pitch we could look in our assorted coffee cans of stuff.
 
They are not a very common thread size. The nuts from Snyders etc will not work. I have been down that road. The tap I got for doing these is a 7/16 27 NS thread. I bought some brass nuts that were large enough but had small threaded holes then drilled and tapped for the JR Motometer I had.
 
SeaSlugs said:
i cant judge how big they are but like electrical toggle switches have a oddball nut size that may fit. Or lamps like suggested.

do you have a thread gauge you could figure out what size they are? im sure someone in the vast internet someone has some. or if we have a size and a thread pitch we could look in our assorted coffee cans of stuff.
Click to expand...
Remember, most tap & die sets come with a THREAD GUAGE.
Bill W.
 
if anybody needs one i could probably make them, john.
Click to expand...
John: If you manufactured correct nuts / hardware for the antique Boyce Moto-Meter, you'd likely sell a lot of them. The four that I have are all "Junior" size with the exact same fine thread. Larger model Moto-Meters look to have a thicker pipe shaft and no doubt different nut size.
 
John Duden said:
what is the size, pitch, and thickness of the nut? i could make about 10 to start
Click to expand...

John,...I'm not sure, my NOS Motometer is at home. There are a number of us,
here on the Barn that have originals, and I'm sure someone will have the size.
If no one comes up with it I'll measure the one I have. Mott (Tom) should
know..

Dudley
 
John Duden,

If nobody comes up with the correct size for the original Junior Moto-Meter nut. I'll take one off of one of my display meters and mail it to you.
I would like to have at least three more extra correct size nuts.;)

Bob-A:D
 
I just measured mine with a thread gauge. It's 7/16X 20, the same as a head nut. In fact I was able to screw and old head nut down about four turns. If yours is the same as mine, Try lowes or Home depot. Use stainless if brass is unavailable.
Terry
 
The thread on an ORIGINAL Jr Boyce Moto-meter is 7/16 27. Someone in the past may have "cleaned" up the threads.
 
Mac's lists a Motometer nut, but just from the picture it looks like coarse threads. I did a Google search for 7/16-27-zilch. Can you just redo the threads on a different nut?-kind of patchwork. John Duden may be your best bet.
 
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