tricky thread

This sounds like thread milling on a CNC. You can get thread mills that do have a carbide-insert that look the same as those used on the lathe. Problem is, you can't use the thread-milling algorithm (a helix-path) of the CNC.

But I may be way off, due to my lack of experience with CNC.

Nick

Yes Me, Me ,ask me [ hands up jumping up and down with legs crossed ]

Are you ready for it.

You want that attachment that features in the recent thread

"Can anyone tell me what this set-up is for an a Myford I have just acquired ?" That will rotate the tool as it moves in.

Sorry couldn't resist but it's very close. Other than that I think what you want is not possible with a special attachment similar to this.

Even a CNC can't rotate a tool to keep tangential.

-- Regards,

John Stevenson Nottingham, England.

Visit the new Model Engineering adverts page at:-

Forget if it is possible

The question has to be asked. Precisely what would such a "thread" achieve?

Can't disclose the purpose yet, be first to let you all know if it comes off ! Mark G.

what about tempering a wash-hand basin tap re-seating tool holder and using it as a tap?

Square to the bore, yes, but why must it be square to the radius tangent and the angled face?

On further reflection, does it even have to be square to the bore?

Sounds to me just a tapered thread.

Why not?

It sounds as if it is merely the addition of another axis (tool tilt?) the equivalent of rotating the tool holder under the computer' control.

What would be the problem?

I agree if you didn't have the axis set up, then it would be impossibl but I see machines with 17 axes of rotation advertised

-- rss

----------------------------------------------------------------------- rsss's Profile:

I think we need to keep practical here. I was talking about conventional CNC lathes which have fixed turrets. True fitting another axis will do this but who wants it. The user can't do it and won't pay to have it done and add 10K to the price of a machine for a feature that's not needed.

Once we get onto a machine with 5 or 6 axis that can do this the owner won't be interested in something like this due to cost. Programming this won't be cheap, probably more than the job is worth.

-- Regards,

John Stevenson Nottingham, England.

Visit the new Model Engineering adverts page at:-

tut tut get on with yer moderating over yonder LMAO...

Wayne...

Fame at last ;o) I am waiting for my sister to bring my camera back, to give you more pictures on that subject. I just hope you lads don't forget me by then. ;o) Ikie

Might be possible with a variation of a taper attachment or a tracer lathe, using a pattern to control the cross feed while threading.

Don Young