Old glass insulators

[Bruce Volden]

I'm looking for a die that will cut threads @ 4 TPI X 1" on dowelstock.
I can find 6 TPI and up but not what I want.
I have a pile of insulators I want to mount in various spots
in the tack room of an old barn I re-habbed this summer.
They will hold bridles, reins..........
Any suggestions?
Thanks

Bruce

[Bradley Gray]

Check out this thread:

https://sawmillcreek.org/showthread.php?85356-Finewoodworking-6-spring-1977

[Bill Dufour]

Do you have a wood or metal lathe? How about a router. If you have these it is easy enough to make a jig to use the router to cut the threads. thread pitch is a simple ramp wound onto a cylinder to get correct spacing.
Bill D.

[Bill Dufour]

I think some house jacks may have used a 1" 4 thread?
In wood I would expect acme or buttress thread form.
Bill D.

[Charles Lent]

You might contact Beal Tool Company. http://www.bealltool.com/products/threading/threader.php They make many types of wood threading tools, although I don't see anything for 1" 4 tpi, but might be able to help you.

House jacks, car jacks, and vises use Acme threads, so that suggestion won't help you.

Charley

[Chris Fournier]

Or dispense with threads, turn an interference fit taper and call it a day. Cheap shot I know...

[Bill Dufour]

Or dispense with threads, turn an interference fit taper and call it a day. Cheap shot I know...

grease the inside of taper and add some epoxy filler before you shove in the wood plug. That should form the threads onto the wood and allow the glass to be unscrewed.
Or just buy new ones.

https://www.southwire.com/products/InsulatorPins.htm

https://www.insulators.info/articles/photos/pinmake1.htm

[Wayne Lomman]

I suspect you won't find a die because that is a big coarse thread to cut manually. The originals were usually either cast, forged or stamped. What will work is to wax the inside of the insulator, drop in a piece of dowel and pour epoxy to make the thread. Let it set and remove or else set and forget. The other alternative is to machine it on metal lathe as already suggested. This will work better if it is machined in steel rather than timber. Cheers

[Ed Labadie]

Some original holders were wood....just be aware the insulators use a tapered thread.


Ed

[John Stankus]

Here is where you can get the pins for insulators (not sure if they are within your budget.

https://www.hubbell.com/hubbellpowersystems/en/Products/Power-Utilities/Line-Construction-Hardware/Pins/Crossarm-Insulator-Pins/c/561525


https://www.graybar.com/store/en/gb/4258-88056132#{Quick%20Order:Y}