My first Double thread

[Janderso]

I think it came out great!
.750” OD.
16 TPI, I had to cut 8 TPI twice.
I used the, advance the compound method. I cut the first thread then advanced the compound, set parallel to the ways, .0625”.

Try it, it’s easy.

 

[OCJohn]

I feel like an idiot asking, but what is the purpose or common application for a double thread. My background is limited mostly to automotive and I don’t think I’ve ever seen one in the wild…

 

[DAT510]

Would the nut be cut the same way?

 

[mmcmdl]

I feel like an idiot asking, but what is the purpose or common application for a double thread. My background is limited mostly to automotive and I don’t think I’ve ever seen one in the wild…

Quick linear motion from minimal rotation . We use up to 7 lead threads on our machines .

Would the nut be cut the same way?

Yes , it would be .


Looks great Jeff !

 

[OCJohn]

You could do that with a steeper thread, though, right? Honest question – I took biology in HS.

 

[mmcmdl]

You could do that with a steeper thread, though, right?

You could , but size is a limiting factor . A 4 lead 8 pitch thread would move .500 in one revolution for example . We have cameras that automaticaly line up multiple layers . The servos are always adjusting in very small increments to keep things straight . No , they won't work on employees as far as keeping them straight . .

 

[SLK001]

How did you check to see that you're done?

 

[pontiac428]

How did you check to see that you're done?

You can still use a standard thread mic, .062 anvil. Check alignment of the starts with a thread gauge. Same as threading, but with a twist.

 

[Janderso]

How did you check to see that you're done?

I personally inspected the part, yep, it's done

 

[Janderso]

Just seeing the thread start 180 degrees from the first just amazes me.