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  1. #1
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    Default Loosening a stuck Chuck

    I saw this and thought it may help someone here in the future


    I personally have a V belt pulley system, so maybe i could to a variation of this on mine. If i get something to work i'll record it and post it up


    https://www.youtube.com/watch?v=2dh0_eumqis

  2. #2
    BobL is offline Member: Blue and white apron brigade
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    Unfortunately not many lathes have an exposed flat section of spindle that can be used in the way shown on that video.
    In that case a piece of hex bar in the chuck and an impact driver usually works pretty well - don't engage pulleys or gears.

    BTW that video shows a home made version of what is called a "strap wrench".
    For about $10 such a wrench using a grippy thick rubber strap can purchased from most hardware stores.
    Screen Shot 2021-05-12 at 6.01.16 am.png

    They are useful for all sorts of things, like undoing highly stick threaded PVC plumbing fittings, but mine lives near my drill press as I use it to loosen keyless chucks, C-wrench holds the chuck tightening collar and the strap wrench holds the chuck outer body.

  3. #3
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  4. #4
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    Hobart
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    Default

    BTW that video shows a home made version of what is called a "strap wrench".
    For about $10 such a wrench using a grippy thick rubber strap can purchased from most hardware stores.
    Screen Shot 2021-05-12 at 6.01.16 am.png

    Mmm. I broke my version of those plastic strap wrench thingies very easily.

    I put the final drive belt onto the largest pulley on the spindle, then with my left hand grip squeeze tight the two parts of the final drive belt together and impact something in the chuck. In the worst case the belt slips in your hand. In the best case the chuck is loose.

    PS the best preventative measure is to be careful installing the chuck. Do not wind it on "speedingly" until it "clunks" on, but slow down as it seats and then put a bit of pressure on it. It should undo easily straight away (compare it with "clunking" it on!)

  5. #5
    Join Date
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    Quote Originally Posted by mathuisella View Post
    I saw this and thought it may help someone here in the future


    I personally have a V belt pulley system, so maybe i could to a variation of this on mine. If i get something to work i'll record it and post it up


    https://www.youtube.com/watch?v=2dh0_eumqis
    Hi Mathu, Guys,

    Some lathes, including my Myford S7 have a pin that is pushed in to lock the spindle whilst the chuck is unscrewed. The trick with preventing a chuck jam, is cleanliness ! Its is vital that the threads both on the spindle and in the chuck body are kept scrupulously clean and well lubricated !

    Also never screw the chuck on more than hand tight, it will tighten up as you use the lathe, particularly on an interrupted cut.
    Best Regards:
    Baron J.

  6. #6
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by Jon.holmes View Post
    I put the final drive belt onto the largest pulley on the spindle, then with my left hand grip squeeze tight the two parts of the final drive belt together and impact something in the chuck. In the worst case the belt slips in your hand. In the best case the chuck is loose.
    If enough impact is used nothing needs to be held.

    We had an old lathe donated to the mens shed that came in with a stuck chuck and several of the old timers tried various methods including the holding the belt method, but the belts kept slipping so they used some belt grip spray which eliminated the slippage but the chuck would still not move. The lathe sat there for a few days until our resident 85 year old fitter and turner expert arrived with a hefty impact driver which he applied to a bit of hex bar held in the chuck and it loosened without holding anything else on the lathe.

  7. #7
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    The heavier the chuck, the heftier an impact driver would need to be.

    A last ditch method that I've used a couple of times sounds savage, but worked out well:

    Place a sturdy board across the bed ways, and a block of hardwood on it, with its thickness equal to the distance between the board and a chuck jaw when horizontal.
    Select a slow direct speed, and momentarily switch on in reverse. That is, ON then immediately OFF.
    Have it so the jaw can move several degrees before whacking the block.
    Repeat that a few times and it might loosen.
    Use the tailstock to control a loose chuck, if it came off.

  8. #8
    Join Date
    Nov 2007
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    melbourne australia
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    Quote Originally Posted by BobL View Post
    BTW that video shows a home made version of what is called a "strap wrench"....They are useful for all sorts of things...
    They are, but the ones with the stretchy rubber strap are no good for removing a stuck lathe chuck. I ended buying one with a thick webbing strap and metal handle. It works well. Like this:

    https://www.homedepot.com/p/Klein-To...S-6H/100648057
    Chris

  9. #9
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    Quote Originally Posted by nadroj View Post
    Beautiful mate. Love your work.
    Aaron

  10. #10
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    Quote Originally Posted by jack620 View Post
    They are, but the ones with the stretchy rubber strap are no good for removing a stuck lathe chuck. I ended buying one with a thick webbing strap and metal handle. It works well. Like this:

    https://www.homedepot.com/p/Klein-To...S-6H/100648057
    Are you in the USA?

  11. #11
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    Hi Neil317,

    Here is the picture you wanted...

    25-05-2021-001.JPG

    The spindle locking pin is partially hidden by the gear cover. You rotate the spindle by hand whilst pushing the pin inwards till it drops into a drilling in the pulley. The pin will rotate but has to be in that position to close the gear case cover.

    Not all Myfords have this pin ! As far as I'm aware it is only fitted on the "Super Seven Plus".

    Best Regards:
    Baron J.

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