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Spindle Bearings on Mill

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by ddickey, Feb 16, 2017.

  1. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Never done this so need some advice from those that have.
    Will I need any special tools?
    Bearing or pulley puller? A press?
    Grizzly g1004. I wanted to start this tonight but I only got to taking off the nut up on top of the spindle. I could not get the driven pulley off. That's why I'm thinking may need a puller.
    Anyone done this before?

    Sent from my XT1096 using Tapatalk
     
  2. mikey

    mikey Active User H-M Supporter-Premium

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    Haven't done this before but looking at the IPB, it looks like you can remove the nut and lock washer on top of the spindle and then pull the pulley off with a puller. The pulley is keyed to the spindle sleeve so it should just pull off. Then you'll find another nut that preloads the upper spindle bearings. How it goes from there I cannot tell just from the drawing but its usually obvious when you look at it. It is very likely that you will need to have a large bearing puller or pulley puller and will also probably need a hydraulic or large arbor press.

    Sorry, cannot be more help.
     
  3. dave_r_1

    dave_r_1 Canada Active Member Active Member

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    A BFH. It's basically a magic do-any tool. Puts things together. Takes things apart. Transforms things into other things. Sometimes does multiple things at once.

    Seriously, I know nothing about removing the spindle from a mill and should not be permitted near yours.
     
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  4. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

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    BFH it shall be but a left handed one. Lol
    Might have to do some midnight maintenance at work.
     
  5. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    If you are going to use a puller on a pulley, clamp some dowel pins into the grooves to help support the weak flanges. or you may soon be purchasing or building a new pulley.
     
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  6. TomS

    TomS Active User H-M Supporter-Premium

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    +1 on what Bob said. Once you get the pulley off remove the fine downfeed mechanism on the left and the downfeed handle/mechanism on the right. Then back off the spindle spring return. Be careful and wear gloves to do this. If it gets away from you it can be painful. There may be a few other items to remove, e.g. a spindle alignment screw. Once all these parts are removed the spindle cartridge should drop out the bottom of the head. Once you get the spindle cartridge out you will see why it's easier to work on it on the bench rather than in the machine.

    You will need a press to remove the old bearings and install the new ones. I don't recommend using a hammer to tap them into place.

    Hope this helps. If you need more info just ask. We're here to help.

    Tom S.
     
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  7. JR49

    JR49 United States Active User H-M Supporter-Premium

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    What the hell is a BFH ????? And why do some members insist on using initials for (probably) Unknown items ????????? Please excuse my rant--Just trying to learn. Happy Machining, JR49
     
  8. dave_r_1

    dave_r_1 Canada Active Member Active Member

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    Sorry, in machining/metal work, it's a fairly well known acronym for big f'iing hammer.

    Note, you generally have to order over the internet if you need a left-hand one. Local hardware stores never carry them.
     
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  9. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Thanks guys for your help.
    At least I didn't say a LHBFH.
     
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  10. ddickey

    ddickey United States H-M Supporter - Premium Content H-M Supporter-Premium

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    Well I took the mill apart tonight. 5 bearings in total. I figured since I had it apart I'd replace all of them. 3 are ball and 2 are angular contact. Not of them seemed to be in bad shape. I was able to pull 3 off but the two on the top of the spindle I couldn't get. I'll go to a mechanic tomorrow and see if they can pull them off for me. Or maybe sneak them into work Monday night and do them there.:cautious:
     
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  11. BFHammer

    BFHammer United States H-M Supporter - Premium Content H-M Supporter-Premium

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    See picture at left....... :grin:
     
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  12. bobshobby

    bobshobby Australia H-M Supporter - Premium Content H-M Supporter-Premium

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    If you haven't fixed it, you didn't use a big enough hammer. Old down under saying.
     
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