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NPT Thread mill toolpath


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#1 MasterCAM Rulez

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Posted 01 May 2002 - 06:02 PM

I need to create a  1.5-11.5 NPT internal thread, I'm not sure if I do it right, i need some help and recommendation.

Alt+C,Thelix-->

1. Enter the Radius: .95  
(top internal diameter of thread is 1.9O0/2 =.95)?
!HELP!  confused.gif  

2. Enter the starting angle: O

3. Enter the incremental angle: 5.
(what angle value should enter i need a recommendation)? !HELP!  confused.gif  

4.Enter the number of revolutions: 4
(how many rev. should i put)? !HELP!  confused.gif  

5.Enter the pitch: .08695
(1/11.5 =.08695)?  confused.gif  

6. Enter the taper angle: 1.79

7.Point entry: Origin

Toolpath

Toolpath,Next Menu,Circle toolpath,Thread Mill,
entities, chain (select the helix geometry),Done, done, done

At TOOL PARAMETER where it said " TOOL DIAMETER",
I dont know what dia. should enter. !HELP   confused.gif  

I use thread milling insert.

Thanks in advance

#2 Jammer™

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Posted 02 May 2002 - 01:41 AM

We just did a bunch of thread milling and found several ways to do it. If your using a thread milling insert, you might want to try: Toolpaths, next menu, circ tlpths, thread mill. Set up your tool parameters, then under thread mill parameters you can set your depth, pitch, etc. The pitch on a 1.5-11.5 is (.08696) You might have to play with your settings a bit to achieve what you want, but it seemed to work pretty well for me. I use a thread mill cutter made by Advent. You might want to check them out. www.advent-threadmill.com  You really need to know all the specs of the tool your using, and pick the min. diameter of your hole to be threaded. It really makes a difference on how the toolpath will be generated. Play around with it and you will see how much changing parameters affects the toolpath. Good luck!

#3 kccadcam

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Posted 02 May 2002 - 10:14 AM

In V9 go to toolpaths, next menu, circ tlpths, threadmill, there is a box to fill in your taper angle for pipe threads. Works great and is easy!!

#4 MasterCAM Rulez

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Posted 02 May 2002 - 08:34 PM

i have a problem when i toolpath a NPT.

1. I already use Alt+C to create 1.5-11.5 NPT thread, the geometry on the scene show the helix move taper (1.79)on XY axis.

2. but when i toolpath the geometry, the toolpath doesnt move taper (1.79)on XY axis, it just cut like a normal thread (UNC or UNF)
milling.  confused.gif  

Does any1 understand my question?  confused.gif  

Thanks in advance

#5 Guy

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Posted 03 May 2002 - 04:22 AM

sure but I don't know the answer  tongue.gif    biggrin.gif

#6 Jammer™

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Posted 03 May 2002 - 08:03 AM

Charlie, I created a thelix using the parameters you gave. I used a 1.000 dia. cutter (just for the hay of it) and it cut the taper on the helix like it should. If you are going to use a thelix to do it, make sure in your parameters that you have cutter compensation set to "off" on both controls. I would recommend you using the "thread mill" toolpath instead of the c-hook "thelix". I think you will have better luck.

#7 kccadcam

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Posted 03 May 2002 - 11:59 AM

I agree with jammer,
use the "threadmill toolpath" --- go to            toolpaths,next menu,circle toolpaths,threadmill-- then all you have to do is pick points just like drilling, fill in all your parameters including taper angle and you'll be on your way.

#8 MasterCAM Rulez

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Posted 03 May 2002 - 12:29 PM

Mr. William can you write down step by step how you do it (1.5-11.5 NPT thread), maybe i missed something.   smile.gif  

Thanks in advance