Okuma lathe lb-3000 spindle problem - machine down
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  1. #1
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    Default Okuma lathe lb-3000 spindle problem - machine down

    Hello everyone. I am putting this out there for discussion in the hopes that I can get my machine running again in the quickest and most cost effective manner possible. In 2013, I purchased a new OKUMA LB-3000EXII and on May 2nd, the machine went down. The OKUMA techs told me is that it is most likely spindle bearing failure, which is a bit concerning given that the spindle only has 3000 hours on it and the machine has only been bumped a couple of times (once when I ran the turret into the tail stock - previous thread - and another when a tool caught a chuck jaw. The OKUMA tech stated that he disconnected everything mechanical that they could and the spindle is still ceased, so they are almost certain it is the bearings and I have no reason to doubt them. The OKUMA techs also stated that there is a special tool or fixture that they use to help pull the spindle from the PREX motor. Unfortunately for me, there is only one tool in the US and it is in North Carolina. So what I am faced with is removing this spindle and then having all the bearings replaced. The machine has already been down for over a week. This tool is a week away with shipping. Do any of you have any experience and advice regarding the best way to proceed with this repair? Is this special tool/fixture absolutely necessary? Is this kind of work best left to the pros? Any advice or comments would be greatly appreciated. Thanks.

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    Quote Originally Posted by bigshooter2 View Post
    Hello everyone. I am putting this out there for discussion in the hopes that I can get my machine running again in the quickest and most cost effective manner possible. In 2013, I purchased a new OKUMA LB-3000EXII and on May 2nd, the machine went down. The OKUMA techs told me is that it is most likely spindle bearing failure, which is a bit concerning given that the spindle only has 3000 hours on it and the machine has only been bumped a couple of times (once when I ran the turret into the tail stock - previous thread - and another when a tool caught a chuck jaw. The OKUMA tech stated that he disconnected everything mechanical that they could and the spindle is still ceased, so they are almost certain it is the bearings and I have no reason to doubt them. The OKUMA techs also stated that there is a special tool or fixture that they use to help pull the spindle from the PREX motor. Unfortunately for me, there is only one tool in the US and it is in North Carolina. So what I am faced with is removing this spindle and then having all the bearings replaced. The machine has already been down for over a week. This tool is a week away with shipping. Do any of you have any experience and advice regarding the best way to proceed with this repair? Is this special tool/fixture absolutely necessary? Is this kind of work best left to the pros? Any advice or comments would be greatly appreciated. Thanks.
    Yeah,the tool is pretty much a must have item. I have not done a spindle in this particular machine but I have the rebuild pdf for it and have talked with some actual okuma techs that have worked on them.

    My recollection of that conversation was that the magnets in that prex motor are very strong. Doing it without the tool to keep things lined up could cost a finger tip. Don't quote me though, this conversation was a few years ago.

    Bite the bullet, wait the week and have someone that knows what they're doing pull the spindle and rebuild it. You *could* do it on your own but there are so many tiny tips and tricks that go into rebuilding a spindle that it's worth it to get it right the first time. After all, you don't want to be doing this again any time soon. . .

  3. #3
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    Thanks for the reply. Yes too complex for me. I have removed the headstock and sent it to a spindle repair shop. Will post updates on the spindle repair.


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