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  1. #1
    Join Date
    Feb 2008
    Posts
    26

    Boss 4 quick change tool holders?

    Does anyone know where you can still purchase the nmtb quick change tool holders for the boss mills. what is the proper name for the?
    Thanks,
    Jodybo

  2. #2
    Join Date
    Jun 2005
    Posts
    16

  3. #3
    Join Date
    Sep 2003
    Posts
    552
    NOTE:

    NMTB tool holder compatibility with Erickson Quick-Change Spindles:
    The NMTB shank was developed for use in the NMTB spindle which uses a draw bar to pull the shank up into the spindle. As a result, small variations in the tool holder flange thickness and the distance from the gage line of the taper to the outward face of the flange were not an issue when selecting one manufacturer of tool holder versus another.
    The Erickson Tool Company developed the Erickson Quick-Change spindle to use the NMTB 30, 40, 45 and 50 tool holders already in existence. The Erickson QC system does not use a draw bar, it uses a quarter turn "locknut" to push and hold the tool holder taper up into the spindle. Two "lips" in the nut push against the outer face of the tool holder flange. The key dimension that causes some NMTB holders to not work in an Erickson Quick-Change spindle is the distance between the taper gage line and the outer face of the flange (dimension L4 + L5 in above tables). L4+L5 on some NMTB holders is too large which does not allow the "lips" in the QC nut to engage the outside face of the flange.
    All NMTB holders made by Erickson work fine and I've read that Collis and Valenite holders work fine (at least the ones made in the last 15 years or so). I've also heard that Kennametal NMTB 30 holders work well. The compatibility of other holders is in question. However, all is not lost, the flange face of the holders that do not fit can be turned or ground down a small amount and then they work just fine. Erickson even put out a procedure to do this very thing (does anyone have a copy of the Erickson procedure ?).

    Darek
    Attached Thumbnails Attached Thumbnails Tapers_NMTB_1.jpg  

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