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Thread: Re: stuck items on machine tools
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27th Oct 2018, 01:27 PM #1Most Valued Member
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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.
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27th Oct 2018, 02:35 PM #2Most Valued Member
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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 TapatalkGirl, 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.
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27th Oct 2018, 03:59 PM #3Most Valued Member
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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
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27th Oct 2018, 09:54 PM #4Most Valued Member
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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.
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27th Oct 2018, 11:33 PM #5
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.
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28th Oct 2018, 09:06 AM #6Member: Blue and white apron brigade
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28th Oct 2018, 03:29 PM #7Most Valued Member
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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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