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  1. #1
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    Default Thread Milling Software

    I'm looking for a program that can generate G Code for a NPS internal thread using a thread mill. My software posts code in arc segments, I'm looking for one that post G03 I,J moves. I've looked and can't find one that doesn't want to use the OEMs own tool. There has to be something that I haven't found yet. Thanks in advance

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    to thread mill a tapered thread, the actual toolpath is a spiral, not a helix, so it needs to be approximated by arc segments.

    A machine with spiral interpolation is what you haven't found yet.

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    I'm looking a NPS thread

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    A macro can be written, using small straight-line segments to approximate the spiral.

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    Just write 1 incremental line in a sub program and loop it.

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    oops, didn't read that one close enough. What software are you using? You should be able to post using full circles or segments.

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    I found this on line and looks like it will get the job done:

    Thread Mill Code Generator – Scientific Cutting Tools, Inc.

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    Have you tried the Iscar mill Thread advisor

    http://www.iscar.com/mts/

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    Quote Originally Posted by ranchak View Post
    I'm looking for a program that can generate G Code for a NPS internal thread using a thread mill. My software posts code in arc segments, I'm looking for one that post G03 I,J moves. I've looked and can't find one that doesn't want to use the OEMs own tool. There has to be something that I haven't found yet.
    I am thinking that you can't. G03 is circular interpolation. It's restricted to a single plane. To create threads you need helical interpolation, which is a circle in one plane with a straight-line move in another plane. If your control doesn't have helical interpolation, then you're going to have to live with line segments.

    I would be surprised if anyone didn't have helical interpolation in this day and age, seeing as how K&T C controls had it standard in 1976, but who knows.

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    Quote Originally Posted by SeaMoss View Post
    I am thinking that you can't. G03 is circular interpolation. It's restricted to a single plane. To create threads you need helical interpolation, which is a circle in one plane with a straight-line move in another plane. If your control doesn't have helical interpolation, then you're going to have to live with line segments.

    I would be surprised if anyone didn't have helical interpolation in this day and age, seeing as how K&T C controls had it standard in 1976, but who knows.
    G2/3 are circular and helical - circular if two endpoints are defined, helical if three. As ridiculous as it is, helical is to this day an option on at least Fanuc (maybe others too, I don't know), and every now and again you'll stumble across one that doesn't have it enabled.

    As an example I have a turning centre, replete with live tools, Y axis, sub spindle, contouring on both spindles, etc. It can do 4 axis simultaneous on either spindle, but helical interpolation is not enabled. Crazy.

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    Quote Originally Posted by gregormarwick View Post
    G2/3 are circular and helical - circular if two endpoints are defined, helical if three.
    But it's not defined that way in the standard, so it's not something you can depend on. So he has to go see how or if his control does helical, instead of just assuming it's G02 - G03.

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    I think you both mean the same thing!

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    Quote Originally Posted by sinha View Post
    I think you both mean the same thing!
    Two nations divided by a common language


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