Another Swinging Threading Tool

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Bernd:
Darern,

There you go, that picture will work quite nicely. What other improvements do think could be done to the tool to make it smaller?

I'm wondering if the material where the slot is, on the part you marked with a red line, could be partially eliminated?

Bernd

Darren:
Do you mean the bottom "ledge" Bernd.

You could reduce this but in my mind mass is everything, esp under larger cutting forces such as threading.

Incidentally Bernd, I think on a machine where there is excessive backlash is where this tool will really shine.... :thumbup:

Bernd:
Yes, Darren, that's were I was thinking, the bottom "ledge". Now that you mention the cutting forces though it's probaly not a very good idea.

I still don't think we are on the same wave length about that backlash. So lets see if I can get at what I mean.

When you take the cut going toward the chuck on a right hand thread there is no backlash. Ok.
Now you stop the lathe and reverse the motor. At this point on my lathe the chuck will turn approximatley 1/4 turn before the lead screw reverses. I can see that the tool would raise up a bit at this point. But on my lathe the chuck will turn one full revolusion before the carriage actually starts in reverse. The tool would have to totaly come out of the cut on a very course thread.

What I saw in my mind was that the tool would get hung up in the groove just cut. Now if the tool can travel all the way out of the cut I guess it works. That was the one reason I questioned the tool Bogs built. Since it was limited to the up travel on it's rerverse path.

The only way I can prove this is to actually build one of these tools and try it out on my machine. Right now I have no ambition to do any type of metal work. So I guess it will have to wait.

I hope I explained it clearly enough. If not oh well, it's been a great disscusion producer. :ddb:

Bernd

Darren:
I understand what you mean Bernd, mine jumps a thread before moving along and I have little backlash. To jump two or more before the leadscrew gets going shouldn't harm anything.

As long as you leave a little run in on the next cut to take the slack up you should be fine :thumbup:

If you were around the corner you could borrow this one to try, but hardly worth sending it back and forth with the cost.

It will be fine Bernd, I'm sure of it :thumbup:

NickG:
Nice work there Darren, thread looks really good.

:thumbup:

Nick

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