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Thread: Tapping 4-40 on CNC

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  1. 11-19-2007, 05:43 PM #1
    petriej
    petriej is offline Registered
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    Tapping 4-40 on CNC

    I have posted regarding this subject before, but I would like to know what tool holder shops are using to form tap 4-40 in 6061. I have done quite a bit of research, but can't pinpoint which holder would be the best for this application. Or should I run solid with a collet? My machine is older, but does have the tapping autocycle.

    Any help is greatly appreciated.

    Thank you
    Star SR20RII/Fanuc 18i, DMG CTX310V4/Fanuc 32i, DMG CTX310ECO/Siemens 8400, Mori NV5000/MAPS, Bridgeport 760/Fanuc 18i, Kiamaster 4NEII60/Fanuc 3t;Partmaker, Gibbscam
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  2. 11-19-2007, 07:01 PM #2
    djr76
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    I use a rigid tap holder with quick change tap adapters for each size of tap. Any collet should work as well though.
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  3. 11-19-2007, 09:41 PM #3
    star-turn
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    Depending on how used your m/c is and whether it supports rigid tapping i would go for a 'floating' holder - one that lets the tap either pull out or compress - you will have more control over getting the tap to cut without snapping.

    PCM do a nice version that fits directly into an ER25 collet holder.

    ST
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