1/2 -14 NPT Internal Threadmilling

[stattp]

Running an old M500/50 Mazak Horizontal.
Looking for a threadmill program for a seco 14 TPI threadmill. Seco's calculator does not work for my Mazak.

Prefer to use G3.1X,Y,Z I,J P, F programming.
Hole dia is .719" tapered to .672" from pipe tap reamer.
Can anyone help me?

[jess fuqua]

I mill that thread.
What tool are you going to use?
I bought a thread mill from thread mills USA part #TM NPT.
With this mill you don't make a tapered hole the thread mill will do it for you.
Also if you buy there threadmill they will make you a program in excel.

[stattp]

I use a Seco R396.19 - 4003.0X14NPT insert threadmill.

[jess fuqua]

Do you have a CAD CAM?

[txcncman]

What do you mean, "Seco's calculator does not work for my Mazak."? It gives you the positions doesn't it? You just need to do a little extra calculation to convert it to the format you need. Post Seco's result here and I am sure someone can explain how to convert it.

[stattp]

Here is the Mazatrol program for threadmilling a 1/2-14 NPT. Not sure why it won't work...

N5G00G17G80G49G40;
N15G91G30X0.Y0.Z0.;
N25G0T20G90G94;
N35M39M6G00;
N45G0X0.Y0.;
N55Z.1000G43H44;
N65S3750M3;
N75G1X0.F1.M8;
N85G1Z-.6514F10.0;
N86G1G41X-.3655Y0.I0J-1F6.2;
N87G17G3.1X-.3674Y0.Z-.4371I.3655J0.P3F6.2;
N88G40G1X0Y0;
N89G1Z-.6514F10.0;
N165G1G41X-.3815Y0.I0.J-1.F6.2;
N175G17G3.1X-.3834Y0.Z-.4371I.3815J0.P3F6.2;
N176G40G1X0Y0;
N177G1Z-.6514F10.0;
N182G1G41X-.3915Y0.I0.J-1.F6.2;
N183G17G3.1X-.3934Y0.Z-.4371I.3915J0.P3F6.2;
N185G40G1X0.Y0.;
N186G1Z-.6514F10.0;
N191G1G41X-.4025Y0.I0.J-1.F6.2;
N192G17G3.1X-.4044Y0.Z-.4371I.4025J0.P3F6.2;
N194G40G1X0.Y0.;
N196G1Z-.6514F10.0;
N197G1G41X-.4025Y0.I0.J-1.F6.2;
N198G17G3.1X-.4044Y0.Z-.4371I.4025J0.P3F6.2;
N203G40G1X0.Y0.D000;
N204G0Z5.000;
N210G49G91G30Z0.;
N215G30X0.Y0.;
N225G90;
N235M09;
N245M19;
N255M99;
%

[txcncman]

Might have to add K value for arc centers. When going from Z-.6514 to Z-.4371 the center of the arc would be about 1/2 way between the two, making K0.1072.

[fordav11]

'it won't work'..... ???

A little more info might help. are you getting an error or alarm? if so what alarm or error?

[stattp]

No error, no alarms, just bad threads. I'm thinking that the taper may be wrong..... Threads don't quite allow the thread gage to depth, and the fittings don't engage deep enough. Fairly new to thread milling, so I'm scratching my head on this one.

[fordav11]

try Vardex Thread Turning, Thread Milling & Miniature Threading | TM Gen
It has support for Mazatrol....

[stattp]

Fordav11.... Just downloaded the Vardex threadmilling wizard. Looks like it may work.... now to wait for the machine time to try it out. Thank you all for the help. I may have some hair left after pulling it out after all.

Paul