Swing threading tool

[BobWarfield]

These swing tools are very neat. I've always liked the idea of not disengaging the split nut while cutting a thread. Just seems more accurate than the threading dial, even though it probably doesn't matter a whit.

Cheers,

BW

[Boucher]

This just screwed up my priority to do list. I am not anywhere near as fast as Gary is, but I have got to do what he did. The Spindel control on the Nardini will make this work fantastic. The other things on the to do list are just going to have to wait a little longer. I really do like those NV insert holders, but one of them is about to be sacrificed in the name of threading progress.

Thanks John for posting this and thanks Gary for your rendition.

[Ian B]

John,

The "traditional model engineering" method for increasing depth of cut when screwcutting has always been to set the compound slide to the thread flank angle, and feed with the compound. Reasoning being that this causes the tool to cut on the left hand edge, rather than both.

You're feeding with the cross slide, and (apparently) having no troubles with surface finish etc.

Any thoughts on this? It's a pain having to set the compound over and then reset the quick change toolpost to be square. If you're cutting a thread in a couple of minutes, this would obviously significantly increase the time taken.

Is it worth the trouble?

Ian

[mardtrp]

You DO NOT have to set the compound slide to that stupid angle AT ALL.

Now some on this forum will say that you do, I'll say Bu!!$#it to that stupid totally outdated theory, so will lots of others, who don't use that outdated confusing stupid crud.

If you just use the infeed to add to the cut, it works, and exceptionally well.
You just watched a video made by somebody who actually "does it for a living" and did you see him stuffin' around setting a compound slide to some stupid angle, no you don't, so it does work.

Now I got to ask the 'naysayers', how does a CNC do the thread cutting, well it just plunges straight in, none of this set over crud.

Don't believe that it will work for you when your threading, well go right ahead and try it, you'll wonder why you have never used it previously, and now you wont get all confused and bugger it up any more.

Mark

[Peter Neill]

Originally Posted by mardtrp

You DO NOT have to set the compound slide to that stupid angle AT ALL.

Now some on this forum will say that you do, I'll say Bu!!$#it to that stupid totally outdated theory, so will lots of others, who don't use that outdated confusing stupid crud.

If you just use the infeed to add to the cut, it works, and exceptionally well.
You just watched a video made by somebody who actually "does it for a living" and did you see him stuffin' around setting a compound slide to some stupid angle, no you don't, so it does work.

Now I got to ask the 'naysayers', how does a CNC do the thread cutting, well it just plunges straight in, none of this set over crud.

Don't believe that it will work for you when your threading, well go right ahead and try it, you'll wonder why you have never used it previously, and now you wont get all confused and bugger it up any more.

Mark

Do you by chance have any views on knurling?


Peter
(who plunge cuts threads as well)

Merry Christmas Everyone!

[mardtrp]

Originally Posted by Peter Neill

Do you by chance have any views on knurling?

This post is about threading, how about gettin' it back on track, eh.


Mark

[Glenn Wegman]

Originally Posted by mardtrp

Now I got to ask the 'naysayers', how does a CNC do the thread cutting, well it just plunges straight in, none of this set over crud.

Mark

Perhaps a refresher course in CNC threading.

http://technology.calumet.purdue.edu.../lecture12.pdf

[Carld]

I'm not a CNC person but it seems I was told that the program in a CNC moves the carriage and crossfeed in a manor that it still cuts on the leading edge of the thread, not both sides as would happen on a manual machine doing a plunge cut.

Plunge cutting a thread will work but it does have problems with tearing the metal and a heavy load on the lathe and work. I never have liked the results with plunge cutting on anything but a fine thread, maybe 18 tpi and finer.

EDIT: mardtrp, look at page 18 of the above linked pdf file.

[Peter.]

Great thread

I'd like to know where those threading tips in Gary Hart's photos come from. Can't find anything like them online!

[Peter Neill]

Originally Posted by mardtrp

This post is about threading, how about gettin' it back on track, eh.


Mark

You're a NOOB, so the humour is lost on you, but the others know what I meant


Peter