Rigid Tapping - Breaking Taps on Tormach - Page 2
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  1. #21
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    Hi nyjiki.
    Rigid tapping call M29 S250 line before G84 .....line (or M54 S250)
    Thro tapping use SPIRAL POINT

  2. #22
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    Another question, what coating does your tap have?
    Hopefully it's not TiAlN or AlTin coating as those are a no-no for aluminum.
    As for speed and feed, as fast as your machine can tap. We tap on our Brother at 6k rpm in aluminum all day long.
    I have a #4-40 tap that has done tens of thousands of holes.

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    have you checked the accuracy of the spindle rpm?

  4. #24
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    Quote Originally Posted by metalmaster1 View Post
    have you checked the accuracy of the spindle rpm?
    What, why...???
    I typed it in.
    I should be within .01 RPM of my number under any load, acc and dec should be instantaneous as that is what I told the computer to do.
    Everything should be right even if going deep on matched as we all know computers, cncs and the math they do is perfect.


    Rigid tap is usually cammed to the spindle encoder so if RPM goes off the feed axis will follow within what can be done.
    I do not know on this machine but machines that pickup only one count per spindle rev have trouble on small fine threads be it lathe or mill.

    Does it break down in the hole deep or also 1/4 in?
    Bob

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    a friend has a tormach, he said he was having trouble tapping with a floating tap holder. Turns out the actual spindle rpm wasn't what was indicated.
    Last edited by metalmaster1; 01-21-2020 at 10:57 PM.

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    Small tap in (gummy) 6061, I'd be going with a roll tap if it all possible.

  7. #27
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    Quote Originally Posted by metalmaster1 View Post
    a friend has a tormach, he said he was having trouble tapping with a floating tap holder. Turns out the actual spindle rpm wasn't what was indicated.
    Color me not surprised. Color the above sarcasm and wait until you tap Al at 10-40,000+ RPM.
    It does not look like a tap run, it looks like a fast punch operation.
    When I first saw Turchin do this in the 80's I was so flat out amazed and the equipment was megabucks.
    Now it is SOP but not in the design of a tormach.

    Floating tap holders have to push the feed above the actual lead in the program or they will not float.
    A floating tap holder in a rigid tap cycle programed at tap lead will fail. No way around this. You may get a few good, it will go away and some blame the taps for this oops.
    Trick here with floating is to not run out of travel but use some of it as the start can not be trusted at all and maybe other parts along the way.

    The OP is rigid in an ER which should be fine to use so different problem.
    Bob

  8. #28
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    Quote Originally Posted by CarbideBob View Post
    Color me not surprised. Color the above sarcasm and wait until you tap Al at 10-40,000+ RPM.
    It does not look like a tap run, it looks like a fast punch operation.
    When I first saw Turchin do this in the 80's I was so flat out amazed and the equipment was megabucks.
    Now it is SOP but not in the design of a tormach.

    Floating tap holders have to push the feed above the actual lead in the program or they will not float.
    A floating tap holder in a rigid tap cycle programed at tap lead will fail. No way around this. You may get a few good, it will go away and some blame the taps for this oops.
    Trick here with floating is to not run out of travel but use some of it as the start can not be trusted at all and maybe other parts along the way.

    The OP is rigid in an ER which should be fine to use so different problem.
    Bob
    So how much more does it have to be fed?


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