[AirChunk]

Hello,
I am trying to figure out how to thread mill using V21.
I have a project I am working on that I have to tap/thread mill a 15mm hole that is 10mm deep , the threaded area will be 8mm deep and a 16 X .1 thread pitch.

Do you u go to the others tab and then choose spiral ,pipe thread and have to know how many turns to make over the threaded distance?

Thanks in advance for the help!

[moldmker]

...
Do you u go to the others tab and then choose spiral ,pipe thread and have to know how many turns to make over the threaded distance?
...

Yes.

Since v21 interpolates the thread into little straight line segments, it's best to uncheck the Arc interpolation box and control your form with the Accuracy value in the Pipe Thread dialog.

If you look at the thread in a front view, it's easier to see how the Accuracy value affects the form.
You will probably need to be down around .0005" to .0001", depending on accuracy req'd.

Since you can only work with whole number of turns, start your helix above the work surface to end at the correct depth and you will also need to add a leadout at the bottom to position cutter for vertical retract.

If your control will handle it, adding G41/G40 (cutter comp) to the code will let you dial in the size at the machine.

good luck

[AirChunk]

Hmm, That sounds good . I will give it a try.

Any suggestions on the actual thread mill to use ?

Maybe something with a 6mm shank and a 12mm head?

Thanks for all your help!

[moldmker]

The largest size you can use is determined by the helix angle vs. dia. of thread.

Manufacturers' websites will have this info.
Also, a lot of them have free downloadable programs that will generate the code for helical threadmilling.

Here's one:

http://www.endmill.com/pages/threadmills.html

[AirChunk]

Wow, thats cool , Thanks!