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  1. #1
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    Sep 2013
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    176

    Number of bellevilles for PDB?

    I recently had a TTS holder pull out which is very rare for me. I have always followed the clean/lube practices and been able to mill to the machine's power limits and even in chatter situations without pulling out. But this happened with a relatively light load so I am trying to figure out why. My mill had been sitting for about 3 months and last time I used it, it was running great.

    I have an 1100 Series II and my instruction manual has 6 bellevilles stacked ()()(). I am looking at the newest instructions and it looks like they went to 8 washers. Why would that be and what do you guys recommend I go with?

    My compressor fluctuates from 100-120PSI before it starts up again, so I always set tension so it will just barely release at 100psi.

  2. #2
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    Join Date
    Jun 2014
    Posts
    1620

    Re: Number of bellevilles for PDB?

    I had the same problem with a .25 endmill a week ago, I installed a new cutter and there was instant chatter, cutter pulled down, luckily I caught it before it broke the cutter, the problem was that I had an aluminum chip on the face of the holder that kept it from seating on the spindle nose. My R8 collet only contacts the tool on the bottom 1/8" and the spindle face so if one of the contact points are not seated correctly I get chatter.

    edit: I have a 2 stage compressor set at 150# and when I get chatter it will pull out the tool.
    mike sr

  3. #3
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    Join Date
    Jun 2014
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    1620

    Re: Number of bellevilles for PDB?

    Quote Originally Posted by cobrakai View Post
    I recently had a TTS holder pull out which is very rare for me. I have always followed the clean/lube practices and been able to mill to the machine's power limits and even in chatter situations without pulling out. But this happened with a relatively light load so I am trying to figure out why. My mill had been sitting for about 3 months and last time I used it, it was running great.

    I have an 1100 Series II and my instruction manual has 6 bellevilles stacked ()()(). I am looking at the newest instructions and it looks like they went to 8 washers. Why would that be and what do you guys recommend I go with?

    My compressor fluctuates from 100-120PSI before it starts up again, so I always set tension so it will just barely release at 100psi.

    They use a stack of 8 pairs now, it has the same pressure on the collet but the belleville washer flex is less.
    mike sr

  4. #4
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    Sep 2013
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    176

    Re: Number of bellevilles for PDB?

    I contacted Tormach and they said they switched to 8 to get a little more static compression (higher force) and still have the required deflection to release the tool.

    I am starting to think the root cause of my issue however is a poorly maintained R8 taper. I will try lubricating it and seeing how it goes.

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