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  1. #1
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,444

    Thumbs up Bearing removal from a blind hole !

    Hi Guys,

    How to remove a ball race from a blind bore came up on another forum recently which reminded me of a method that I used to remove one.

    I turned a piece of rod down to be a tight push fit into the bore of the bearing and drilled a tapping size hole down the centre. I then cut a slit in the end just longer than the bearings width with a hacksaw and squashed the slit closed at the end using a vise, after which I threaded the hole keeping the slit closed with the vise.

    Using a bolt and putting my just made extractor into the bearing bore and tightening the bolt, thus expanding the slit rod end to tightly grip the bearing, using a hooked slide hammer to remove it. A little heat on the outside helps as well.
    Best Regards:
    Baron J.

  2. #2
    Join Date
    Dec 2018
    Location
    NSW
    Posts
    586

    Default

    The trick with pilot bearings on vehicle clutches is to get a tightly fitting dowel and packing the hole with grease. Hammer it in and repack grease as necessary to hydraulically drive out the bearing.
    You can play with grease viscositites to account for different tolerances. I've even heard of guys tearing up bits of bread to achieve the same outcome.

  3. #3
    Join Date
    Apr 2018
    Location
    Perth
    Posts
    168

    Default

    Quote Originally Posted by Commander_Keen View Post
    The trick with pilot bearings on vehicle clutches is to get a tightly fitting dowel and packing the hole with grease. Hammer it in and repack grease as necessary to hydraulically drive out the bearing.
    You can play with grease viscositites to account for different tolerances. I've even heard of guys tearing up bits of bread to achieve the same outcome.
    Or wet paper towel.

  4. #4
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    In a hurry once, I removed a ball race from a dead-end hole in a light alloy case, by welding a threaded rod to the inner race.
    Then I could pull it out, and no harm done (except to the bearing).

    I now have a really cheap Asian blind bearing puller set with slide hammer included. It works sometimes.

  5. #5
    Join Date
    Nov 2008
    Location
    North Brisbane. Qld. Australia
    Age
    70
    Posts
    1,511

    Default

    I have a proper blind hole bearing puller set, but before that have even used a dynabolt.
    Nev.

  6. #6
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    I have used swear words.










    didn't work.
    Gold, the colour of choice for the discerning person.

  7. #7
    Join Date
    Jul 2006
    Location
    Athelstone, SA 5076
    Posts
    4,255

    Default

    Quote Originally Posted by .RC. View Post
    I have used swear words.



    didn't work.
    Nor me.
    It lessened the stress tho

  8. #8
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,542

    Default

    I did once use the 'weld inside the race' method and it worked surprisingly well.

    Michael

  9. #9
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default

    Quote Originally Posted by BaronJ View Post
    Hi Guys,

    How to remove a ball race from a blind bore came up on another forum recently which reminded me of a method that I used to remove one.

    I turned a piece of rod down to be a tight push fit into the bore of the bearing and drilled a tapping size hole down the centre. I then cut a slit in the end just longer than the bearings width with a hacksaw and squashed the slit closed at the end using a vise, after which I threaded the hole keeping the slit closed with the vise.

    Using a bolt and putting my just made extractor into the bearing bore and tightening the bolt, thus expanding the slit rod end to tightly grip the bearing, using a hooked slide hammer to remove it. A little heat on the outside helps as well.
    Hi John. I must be misunderstanding what you mean, as can't get my head around how that could work.

    If you squeeze the slit end while threading won't you take more material out of the split section with the tap - resulting in a clearance to the bolt thread when it relaxes back to parallel? How would the bolt expand it?

    The only way I can see it being able to expand and grip the bearing bore is if there was LESS material taken out of the split section by the tap, which would either require expanding the split end while tapping, or using a tapered tap and not cutting a full depth thread into the split section.

    Steve

  10. #10
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,444

    Default

    Hi Steve,

    The screw down the middle pushes the taper apart causing the plug to grip the bearing bore.

    Argh I've just re-read what I wrote, yes you are right, I've got the work order wrong.
    Thread the bore and then squash it.

    I'm going to blame it on brain way ahead of my fingers, or something like that.

    Thanks for pointing it out !
    Best Regards:
    Baron J.

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