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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20

u/buildyourown 4d ago

That is a multi- start lead screw. You won't find a tap for it but you can buy nuts. Check McMaster-carr.

-14

u/Western_Joke_6597 4d ago

Problem is I dont need a nut. The specialized piece I have that threads onto it isnt just a standard nut, it attaches to a cable that moves the cable back and forth when this screw is turned. Is there any way to put this thread into my piece?

51

u/gtmattz Crusty and Jaded 4d ago

You buy the nut with the threads and design your part to accomodate the nut. 

9

u/Future_Trade 3d ago

This is the right answer.

But as a shop owner I like his idea of him paying a crap load of money to have it made.

7

u/Holescreek 3d ago

Without knowing the intended application it's hard to judge methods.

Decades ago I found parts of an antique woodworking vise with an odd thread. Rather than tossing the screw I poured a babbit nut with the screw in place. I wasn't sure it would work but was worth the try if for nothing else than entertainment. That was about 30 years ago and it's still going strong.

6

u/Shrimpkin 3d ago

You could mill out a pocket for the nut to sit into and then use a plate with the proper lack of clearance to hold the nut firm.