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  1. #1
    Join Date
    Jun 2007
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    Default Re: stuck items on machine tools

    After reading recent posts/ questions regarding stuck items on machine tools I would recommend removing your work holding tool from the machine spindle once the current job at hand has been completed.

  2. #2
    Join Date
    Aug 2011
    Location
    Melbourne
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    Default

    Thats probably pretty good advice PC.

    Having gone from a machine with a MT4 spindle to an ISO40 with a captive nut that extracts the collet purely by turning the drawbar nut, im loving it!

    I can appreciate collets getting stuck. I used to have belt the crap out of the drawbar to get it to release even if only nipped up.

    Simon

    Sent from my SM-G900I using Tapatalk
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  3. #3
    Join Date
    Nov 2007
    Location
    melbourne australia
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    3,228

    Default Tips and tricks

    I think pipeclay’s advice is good, however I never do it and haven’t had any problems to date.

    For my screw-on chucks I clean and oil the threads before fitting. Then I only lightly tighten them by hand.

    For my MT4 collet chuck I make sure the bore is clean and only nip up the drawbar. I have a spindle thread protector which doubles as an extraction tool. It sure beats belting the end of the drawbar with a hammer.

    I’m constantly swapping chucks, so that probably helps prevent them jamming on/in the spindle.

    I suspect some people tightening the drawbar way too much too.
    Chris

  4. #4
    Join Date
    Jul 2016
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    Melbourne
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    35
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    Default

    With Morse taper tooling you really don't want it to spin in the socket but you also really don't want to reef up the drawbar, it's a fine line. Something like a torque wrench might be a good drawbar spanner.

  5. #5
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Guys,

    My secret to tightening the drawbar on my mill with an MT3 taper is to use a key with a short "T" bar.
    My key is a hollow square with a 5" long "T" bar fastened at the centre. Since you can only grip it with one hand its very hard to over tighten it.
    Though I must admit I some times need to use a short length of tube on the key to crack the taper.
    Best Regards:
    Baron J.

  6. #6
    BobL is offline Member: Blue and white apron brigade
    Join Date
    Feb 2006
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    Perth
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    7,182

    Default

    Quote Originally Posted by caskwarrior View Post
    With Morse taper tooling you really don't want it to spin in the socket but you also really don't want to reef up the drawbar, it's a fine line. Something like a torque wrench might be a good drawbar spanner.
    Next time a pro spins down a draw bar it would be handy to know the torque value they used.

  7. #7
    Join Date
    Jun 2007
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    sydney ( st marys )
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    Default

    From my point I couldn't tell you, Home and then a nip.
    Not a " pro" or a drip under pressure just a tradesman.

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