How do I thread mill a 1" NPTF thread?
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  1. #1
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    Default How do I thread mill a 1" NPTF thread?

    On milling machine by fly cutter.
    Thanks

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    Come on pal, at least make it look like you spent more than 10 seconds researching this topic before asking a question.

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    Here is a link to a site with a decent thread milling calculator.

    Thread Mill Code Generator – Scientific Cutting Tools, Inc.

    You may have to tweak the layout to suit whatever control you are running. It also uses the center of the hole as X0 Y0. If your hole is at a location other than that, you will have to adjust the programmed positions for X and Y.

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    Quote Originally Posted by Vancbiker View Post
    Here is a link to a site with a decent thread milling calculator. ...
    Vance ..... I mean WTF!

    Is it me or you who is drunk!

    Just how exactly do you interpret the OP's statement:

    How do I thread mill a 1" NPTF thread on milling machine by fly cutter.
    Or, did I miss something .....

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    Quote Originally Posted by SeymourDumore View Post
    Vance ..... I mean WTF!

    Is it me or you who is drunk!

    Just how exactly do you interpret the OP's statement:



    Or, did I miss something .....
    I assume he means "flycutter" to be a single point tool. I've used a lathe threading bar as a threadmill before in a pinch, which is effectively a flycutter at that point.

    Maybe I'm giving OP too much credit!

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    Quote Originally Posted by SeymourDumore View Post
    Vance ..... I mean WTF!

    Is it me or you who is drunk!

    Just how exactly do you interpret the OP's statement:



    Or, did I miss something .....
    You may have missed an earlier thread where the OP asked about tapping a 1" NPT. When told that G84 was fine for tapping NPT, he responded that tapping was not really what he was trying to do. I then said he should start a new thread (this one) and ask about thread milling a 1" NPT. Between the 2 threads I suspected that English is not his primary language and he is probably having some trouble with translation of terminology.



    @gregormarwick...

    I have done threadmilling with a boring bar a couple times. It worked and for an emergency (coarser pitch than I had a proper thread mill for on hand) I was OK with it. Would not choose it as a standard practice though.

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    Quote Originally Posted by Vancbiker View Post
    You may have missed an earlier thread where the OP asked about tapping a 1" NPT. When told that G84 was fine for tapping NPT, he responded that tapping was not really what he was trying to do. I then said he should start a new thread (this one) and ask about thread milling a 1" NPT. Between the 2 threads I suspected that English is not his primary language and he is probably having some trouble with translation of terminology.



    @gregormarwick...

    I have done threadmilling with a boring bar a couple times. It worked and for an emergency (coarser pitch than I had a proper thread mill for on hand) I was OK with it. Would not choose it as a standard practice though.
    Thanks for all reply.

    I mean use milling machine with a one point cut to cut thread hole like this:
    milling fly cutter - Google Search

    I used the way cut the M42x2 thread hole quite good. but don't know how to cut pipe thread. need help.
    Thanks.

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    Why I can‘t see my reply I just made? anyway please don't upset when you see twice.

    I used milling machine with fly cutter to cut M42X2 thread hole quite well, don't know how to cut pipe thread hole. the cutter like this:

    milling fly cutter - Google Search

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    To use a single point tool like your fly cutter it would be best to use a macro program. Something like this....

    Post | CNC training | CNC Concepts, Inc.


    If you are only going to make one part I can see doing it that way. If you are making many parts then you should look into buying a 1" NPT thread mill. It will be much much faster.

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    -----------------

    Think Snow Eh!
    Ox

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    OH the value of being able to manually code. Something like this should take about 15-20 minutes to write long hand. You only need about 10 threads so that is 20 lines of code plus program begining and end.

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    Even 30 yrs ago on a B-port I don't think that I have ever had or even really ever used a "fly cutter".
    The thought of using one today just boggles my mind.


    ------------------

    Think Snow Eh!
    Ox

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    Quote Originally Posted by Vancbiker View Post
    To use a single point tool like your fly cutter it would be best to use a macro program. Something like this....

    Post | CNC training | CNC Concepts, Inc.


    If you are only going to make one part I can see doing it that way. If you are making many parts then you should look into buying a 1" NPT thread mill. It will be much much faster.
    Thank you, I'll try it, just 1 part.


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