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  1. #1
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    Spindle adjustment

    My 2015 vintage SBL-15 lathe has a bit of rumbling or vibration noise noise at 1500 rpm or above when using the manual 5C collet closer. I haven't checked for noise with a 3J or 4J chuck so don't know if that would make a difference.

    Is there a Tormach-approved procedure for adjusting the bearings? I'm wondering if the assembly has loosened up a bit over the past few years. I emailed support about this yesterday but haven't heard back from them yet.

  2. #2
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    Re: Spindle adjustment

    Hi Michael.

    I dont think that is outlined in the manual, so please post any information you receive here.

    I think they are angular contact opposed greased ball bearings. It is possible they are not always perfectly adjusted ex the factory, which could mean adjustment would be required sooner than normal.

    A good plan to catch it early if that is the case. Cheers Cliff

  3. #3
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    Re: Spindle adjustment

    [QUOTE=keen;2220448]Hi Michael.

    I dont think that is outlined in the manual, so please post any information you receive here.

    I think they are angular contact opposed greased ball bearings. It is possible they are not always perfectly adjusted ex the factory, which could mean adjustment would be required sooner than normal.

    A good plan to catch it early if that is the case. Cheers Cliff[/QUOTE]

    Thanks Cliff. I'll be sure to update here on whatever Tormach tells me. I'm a little surprised that they haven't addressed spindle bearing adjustment yet in the manual now that it is about 2 years since the SBL-15 was first released.

  4. #4
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    Re: Spindle adjustment

    Tormach got back to me via voice mail (I couldn't talk when they called) and they seemed to think that my lever-type 5C collet closer is out of adjustment and that may be causing the problem. I'll try my 3-jaw chuck and see if that setup is also noisy. If not, the collet closer will need some adjusting.

    FWIW, I was told that the spindle bearings are not in a cartridge so adjusting them is apparently a difficult process and none of the lathe owners has needed to adjust the spindle so far.

  5. #5
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    Re: Spindle adjustment

    Thanks Michael , yes keep us posted, good to hear there has been no spindle adjustment needed to date. I wonder how many 15L's are out there in regular use?


    Cliff

  6. #6
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    Re: Spindle adjustment

    Tried out my 3-jaw chuck in place of the 5C collet closer and the noise is the same or a bit worse so it looks like closer adjustment was not the issue. I'll be following up with Tormach tomorrow.

  7. #7
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    Re: Spindle adjustment

    Michael, I have what is possibly the same issue with my Slant Pro. Tormach was useless in getting this fixed and now I live with this until something breaks catastrophically. Tormach entertained me with stuff to look at like aligning collet closer, but after I sent them video of same noise without collet closer they slowly gave up. I would really be interested to hear whether you find solution.

    This and problems with my 440 are the reason I will never recommend Tormach to anyone again. They gave up on both issues and while I can still use Slant Pro, I can't use 440...

    Here is video of the noise, it happens with or without 5C collet closer installed:

    [video=youtube;0WFxeyHZN4Y]https://www.youtube.com/watch?v=0WFxeyHZN4Y[/video]

  8. #8
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    Re: Spindle adjustment

    coffee - mine doesn't like that at all and is more of rumble or vibration that gets generally worse with spindle speeds above 1500 rpm. I tried recording video at different speeds but the camera doesn't hear the noise the way that I do. Sounds like you have a "tick-tick" noise in there though maybe that is the sound of the cutter engaging the work.

    I called Tormach again today and the tech support person suggested that I try removing the encoder belt from the spindle as he said that sometimes causes a ticking noise, so that may be something to check out if you haven't already.

    We also discussed the main spindle belt or the motor as possible problems so I'll be checking out all those possibilities tonight or tomorrow. My plan is to check the noise level with a smartphone app at various spindle speeds and in various configurations. I plan to let the spindle fully warm up and run the tests all at once.

    Feel free to tell me if this makes no sense or is likely to be non-productive.

  9. #9
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    Re: Spindle adjustment

    If I remember mine started with tick-tick and slowly progressed to this...

    Your plan of attack sounds good, I looked into all that...

  10. #10
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    Re: Spindle adjustment

    Well, I ran through several configurations at speeds of 1,000 to 2,500 rpm after letting the spindle warm up at 1,000 rpm for 3 hours. I still have a few more tests to run, but no configuration change, from no chucks and the encoder and belt disconnected to encoder/belt connected and 5C collet installed seems to have any sort of significant effect on the noise. In fact, running the spindle for 3 hours seems to have the most effect on the noise and it is now moderately close to acceptable in any configuration and any spindle speed other than perhaps 2100-2400 rpm. There is a noticeable "warble" or resonance at 2250 rpm which is much less objectionable at 2,000 or 2,500 rpm. The spindle temperature cold dead at the start to the end of this test with about 6 hrs of spindle on time was pretty stable at about 80 °F in my 75 °F basement and the spindle belt temperature increased from 80 to 100 °F. I'd have thought the spindle would have increased temperature more than that, but is really under very little load.

    I'll finish the tests tomorrow and try to chart the results.

  11. #11
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    Re: Spindle adjustment

    Here are the results of my spindle noise tests. The 1st file has the effects workholding spindle options and encoder connection on spindle noise and the second file is spindle with the encoder attached and the 5C lever-type collet chuck installed with a cold and warmed up spindle.

    Noise levels were pretty much the same with or without the encoder installed and with or without a 3-J chuck or the 5C collet closer installed. By comparison, the noise level with a that had sat overnight (Cold Spindle) was quite a bit different (and louder) than with a spindle that had been run for several hours (Warm Spindle), though the actual spindle temperatures were about the same (76 and 78 °F, respectively) according to my cheap handheld IR sensor.

    Any thoughts?

  12. #12
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    Re: Spindle adjustment

    I take it you haven't gotten anywhere with this?

    Mine is as noisy as ever and annoys me to no end.

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