Need Help! Dreaded LB15 Spindle issues again


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Thread: Dreaded LB15 Spindle issues again

  1. #1
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    Default Dreaded LB15 Spindle issues again

    Hi, last year I had trouble with the spindle on my mid 80's LB15. With help from here I was able to get the old girl going, but the problems have started again. It seems that as soon as the weather starts to cool off, she doesn't like to start in the mornings. Later in the day all is good.

    I have isolated the problem to the speed sensor on the spindle motor. I proved this today by pulling the motor out , removing the fan & then the sensor cover & heating the sensor with my daughters hairdryer. After only a couple of minutes of warming, the motor runs fine in both directions

    My question is, what components on the sensor can be effected by warmth in this way

    Here is a pic

    Any thoughts would be appreciated. Thanks

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    Default Re: Dreaded LB15 Spindle issues again

    Ok, I have worked out that it must be a weak magnet that in someway responds to heat. I adjusted the clearance between the toothed wheel & magnet to 0.05mm & she runs fine. Does anyone know how much "air gap" there should be? I am concerned that having too little gap may lead to interference between the two once everything warms up. Cheers.



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    Default Re: Dreaded LB15 Spindle issues again

    A big thanks to Jim (doctorcnc) for helping me out again. It is great having people with such extensive knowledge of these machines & who are willing to share it. Regards wc56



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    Default Re: Dreaded LB15 Spindle issues again

    Thought I would do an update in case someone else has this problem. I purchased a used sensor from the US & had it fitted & tuned in over the weekend. The old girl is going good once again. I still don't know what was wrong with the old sensor. I thought maybe a weak magnet, but the replacement didn't feel any different. The tech who tuned the new one thought maybe a dodgy solder joint, but doesn't know for sure. Regards WC56



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    Default Re: Dreaded LB15 Spindle issues again

    I would tend to agree as well with the solder joint theory, but could also be gap. From what I was told they should be about .5mm or .02" for a correct gap. I usually tend to set them a little closer, but would not get too close because you can wreck them if they rub. I personally like the .01-.015" range.

    Best regards,

    Experience is what you get just after you needed it.


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Dreaded LB15 Spindle issues again
Dreaded LB15 Spindle issues again