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Belt or Gear Mill

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  • Dr. Rob
    replied
    Quiet, quiet, quiet. Just did a conversion project for my mill, from gear to belt. Shhh.

    Leave a comment:


  • JRouche
    replied
    I like a mill with back gear and belt drive with a three phase AC motor being driven by an A/C drive or variable frequency drive for speed control. Just like my Bridgy 2J.

    So for me I guess gears and belts

    If not the VFD then at least the back gear and variable sheave pulley with belts.

    JRouche

    Leave a comment:


  • precisionworks
    replied
    Maybe I'll live long enough to get a gearhead or VS mill. When the belts are set to 1500RPM to drill a tiny hole, you have to flip them to tap at 150RPM, which means removing & repositioning both belts. A stool or short ladder is required. My hands get pinched most every time, but still have ten fingers, so far. Under really heavy loading (drill & tap 3/4" thick HRS with a 3/4"NC tap) belts will slip unless VERY tight. Yadda, yadda, yadda.

    Any guess what my next machine will have?

    Leave a comment:


  • sch
    replied
    Depends on how you like to use your time.
    Gear heads are noisy but easy to change
    speeds on. Belt drives are quieter, but
    a real PITA to change speeds on. Your
    PITA coefficient may vary and it helps to
    get cogged belts. Resonance vibrato can
    be more of a problem with belt drive.
    Square column is worth the $300-500 differential in price over round column.
    You get a few more speeds with belt drive
    which sometimes is useful. 3ph /VFD conversion with belt is easy but doesn't completely get rid of the need to change
    the belt position at extremes of speed change. If you don't change setups alot
    then these are lesser considerations.
    But if you face mill, plunge or edge mill
    then drill some holes and tap you will be
    changing setups a lot. Changing belt speeds
    is a lot more trouble than say a Bridgeport type. Steve

    Leave a comment:


  • Guest's Avatar
    Guest replied
    the variable speed is nice that you can speed up or slow down during the cut,(like a chattering borring bar you can slow it down and get it to stop chattering.)

    belt drive is fine too, it just takes a few second to change speeds.(olny 8 speeds)

    I would go for the variable speed if I could.

    Leave a comment:


  • seajays2
    started a topic Belt or Gear Mill

    Belt or Gear Mill

    Any pro's and cons for either?
    John
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