Single Point Theading using Power Down Feed-Is it Possible?

W

Walt

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I suspect the answer is "no". Mainly because I found no information here or by Googling the web.

Why not?

My uninformed guess is:

There's no easy way to align the cutting tool back to the cut between passes.
The rotational speed of the spindle is too high on most mills.
The feed rate is relatively too slow at a given spindle speed. PDF gearing is made for cutting a smooth bore.

But I'd like to hear from people who actually know what they are talking about!

Walt
 
I do believe that you have hit the nail square on the head.

Threading, with a single point, or one of those fancy thread forming end-mills, requires CNC control with the ability to do Helical Interpolation. (Fancy term for making helix in the X, Y, and Z - axes simultaneously.)

-Cody
 
I dont understand very well your question, but a procunier tap head does it with only a drill with free quill, I seldom do taping in aluminum with a hand drill that has a torque clutch. A friend of mine does tap his truck clutch bells straight with only the drum switch of his mill. He has so much practice... So I guess tapping can be done.
 
At one time, there was a single point threading attachment made for a Bridgeport mill. A gear was attached to the spindle nose and drove another gear to which a vertical leadscrew was attached. It was designed to internally thread holes in workpieces too big or awkward to swing in the lathe. A boring head was used to hold and advance the threading tool between passes. Somewhat awkward to operate, but got the job done. I only ever used one once. Thread milling on CNC machines sort of obviated the need for these devices, and I haven't seen one, or seen them advertised for years.

Regards
Bob
 
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