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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > Wrecked bearing, coolant contamination
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  1. #1
    Junior Member
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    Dec 2011
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    22

    Wrecked bearing, coolant contamination

    Coolant and some chips got into my spindle bearings on my G0704.

    I am shocked I haven’t heard of this before after taking apart my spindle for an autopsy of the bearings.
    I get that there can’t be a seal around the shaft due to high speed but there must be a way to stop coolant from getting in there.

    I was so happy with my high pressure coolant, but milling with a 1/8” end mill choked up tight in an R8 collet slotting .375” caused a spray angle that had a good shot into the bearings, they made a bad noise and locked up enough to stall my stock motor, belt conversion spinning at ~4000rpm.

    I am going to machine a disc and shrink it on, and put an oil ring behind that, pics to follow....

  2. #2

    Re: Wrecked bearing, coolant contamination

    I just use an o-ring above and below the spindle nut to form a labyrinth seal, it's pretty good but not perfect. Adding an oil drip took it to the next level. I've wrecked plenty of bearings over the years due to many reasons, but this spindle arrangement has been really good, basically maintenance free.

  3. #3
    Junior Member
    Join Date
    Dec 2011
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    22
    Quote Originally Posted by CL_MotoTech View Post
    Adding an oil drip took it to the next level.
    I’m very curious about the oil drip. Please tell me more.

    I have seen a lot of bearing carnage too, I’m a millwright in a sawmill, last night at 3am we got a call because a conveyor stopped moving, found the tail drum bearing (2 15/16” shaft) had crapped out it’s rolling elements and the shift was eating into the pillow block. The company doesn’t want down time and in this spot it is a 2hr plus job to get to out and changed, that’s IF the shaft is still useable. All we did was repair the grease line going to it and pumped in two tubes of grease and let it run, until next scheduled down day....... in 3 days!!!
    I head back in a couple hours to see how it’s doing.

  4. #4

    Re: Wrecked bearing, coolant contamination

    My spindle gets Vectra via the automatic oiler. My bearings were less than $20 for the pair. 6k all day and they are cool and quiet.

  5. #5
    Member
    Join Date
    Jan 2005
    Posts
    11668

    Re: Wrecked bearing, coolant contamination

    Quote Originally Posted by Upnorth4 View Post
    Coolant and some chips got into my spindle bearings on my G0704.

    I am shocked I haven’t heard of this before after taking apart my spindle for an autopsy of the bearings.
    I get that there can’t be a seal around the shaft due to high speed but there must be a way to stop coolant from getting in there.

    I was so happy with my high pressure coolant, but milling with a 1/8” end mill choked up tight in an R8 collet slotting .375” caused a spray angle that had a good shot into the bearings, they made a bad noise and locked up enough to stall my stock motor, belt conversion spinning at ~4000rpm.

    I am going to machine a disc and shrink it on, and put an oil ring behind that, pics to follow....
    You can get Rubber shielded AC Bearings that would help you with this problem, you can make a Labyrinth seal which will help also, so adding a slinger as part of a Labyrinth seal is the best way to go
    Mactec54

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