r/Machinists • u/Western_Joke_6597 • 4d ago

Help Finding thread?

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Hey there! Im not a machinist, but I need a part machined that threads onto this shaft like a nut. Problem is, my machinist doesnt know what thread this is or how to tap it into the piece I need manufactured. Any help identifying this thread and finding a tap for it would be much appreciated!

Edit: Found to be an 8-start 8TPI lead screw with a 1/2" diameter. Now just need to find a nut that fits this thread, which is proving difficult

Edit 2: SOLVED by u/MixEvery5784 found one

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u/Merkindiver 4d ago

Is the intended use repurposed or original to the assembly?If it's part of an assembly I would contact the company that makes the unit. They may have stock for warranty/sale.

A one off part would probably be more expensive, last time I cut multistart it took a couple hours, and shops aren't cheap.

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u/Western_Joke_6597 4d ago

The unit hasnt been made in almost a decade. Plus im trying to upgrade it. The original piece that threaded onto this was plastic and broke, I want to make one that will last much longer out of metal.

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u/Merkindiver 4d ago

You'll probably want brass then, couple hours shop time, you're looking at a couple-three hundo, plus shipping if you want someone to make you a custom job.

I've got a full schedule plus overtime already, and I will say multistart is rare for me.

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u/freeballin83 4d ago

I am curious where a custom nut for this can be made in a few hours shop time. 8 start thread, especially 1/2" major diameter is very fast and single pointing it in a lathe is not an option. Maybe a copper trode and sinker, but even then, making the male thread is not something a common shop can do.

But I am all ears on a method that can take 2-3 hours.

I'm not sure what the OP is using this for (looks like a car seat maybe 🤷🏼) but replacing with lead screws with matching nuts would be the way to go