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  1. #1
    Will_D's Avatar
    Lives in Malahide, Co. Dublin, Ireland. Last Activity: 21 Hours Ago Has been a member for 0-1 years. Has a total post count of 27. Received thanks 1 times, giving thanks to others 1 times.
    I have been trying to find a floating tap holder using ER collects and R8 shank. No luck.

    All I can find are ISO or MT shanks.

    How do these work? How does the tap (or reamer) float?

    Could I just make one?

    Will

  2. #2
    I am not sure exactly what you want to do, but ArcEuro sell a set of sliding tap and die holders.

    http://www.arceurotrade.co.uk/Catalo...ilstock-Turret

    Then you would need to machine an R8 soft end to 16mm to hold it. This is a lathe accessory though and I can't imagine it being used in a milling machine quill.
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Having just moved to Windows 10 (which is crap) My stress levels are through the roof !!!

  3. #3
    I'm sure you could make a floating tap holder, it just needs to be spring loaded up and down so it floats in a central position but allows free movement for Z synch error on a mill without rigid tapping capability, then add a way to hold a tap.
    Splines or a cross-pin can be used to provide drive whilst allowing vertical float.
    You think that's too expensive? You're not a Model Engineer are you? :D

  4. #4
    If your mill doesn't support rigid tapping is Thread Milling an option for you?
    You think that's too expensive? You're not a Model Engineer are you? :D

  5. #5
    These pcm collets hold taps and are sprung loaded, they are available in the whole range of er sizes.

    You can buy them from wnt but they are quite pricey, I found a few er25 on ebay that I use on my Denford triac. If you buy the largest diameter you can find you can make sleeves to hold smaller taps.

    https://www.pcm.ch/en/products/tapping-collets

  6. #6
    Cutwel also sell them if this is suitable for you...

    https://www.cutwel.co.uk/tool-holdin...h-compensation

  7. #7
    Will_D's Avatar
    Lives in Malahide, Co. Dublin, Ireland. Last Activity: 21 Hours Ago Has been a member for 0-1 years. Has a total post count of 27. Received thanks 1 times, giving thanks to others 1 times.
    Thanks James but have you seen the price!! Over 100 per tap size. There are tapping collets available (Standard ER collects with a squarenhole at end to fit specific taps) at about a quarter of the price. Trouble is the collet holders are not available in R8. Question still is how do springs allow the tap (held rigidly by the collet) to float in the holder.

    They have to be able to float in all 3 axes but still apply torque to the tap?

    How are these floating holder designed?

  8. #8
    Will_D's Avatar
    Lives in Malahide, Co. Dublin, Ireland. Last Activity: 21 Hours Ago Has been a member for 0-1 years. Has a total post count of 27. Received thanks 1 times, giving thanks to others 1 times.
    @magicniner: I am only tapping up to say M10 so no need to thread mill

  9. #9
    Quote Originally Posted by Will_D View Post
    They have to be able to float in all 3 axes but still apply torque to the tap?
    No they don't.
    Floating tap holders assume the machinist/CAD/CAM Monkey is competent enough to align X and Y and only float in Z, this is to prevent breakage when a machine's Z feed doesn't perfectly match the required movement for the tap to maintain neutral tension.
    Floating reamer holder requirements differ
    You think that's too expensive? You're not a Model Engineer are you? :D

  10. #10
    Quote Originally Posted by Will_D View Post
    @magicniner: I am only tapping up to say M10 so no need to thread mill
    I Thread Mill down to M3, some things I make require a full thread right down to a shoulder, this has internal and external full threads to shoulders.

    Click image for larger version. 

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    Internal and large external are both 1mm pitch and so were cut with one thread mill, if you are only tapping bolt holes milling may be overkill but it also allows you to produce any class of thread with one tool, unlike taps. ;-)
    You think that's too expensive? You're not a Model Engineer are you? :D

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