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Thread: Backlash

  1. #1
    Join Date
    Jan 2004
    Location
    windsor boat works limited, gravenhurst ontario
    Posts
    92

    Default Backlash

    Hi . I'm setting up a new to me PRS which is replacing my old unistrut machine that has served me well for 17 years . I must say that I am impressed with the evolution of the shopbot . I am having a bit of trouble though figuring out how to tension the pinions against the gear racks on the X axis . ---How much backlash is acceptable ? --On the old unistrut machine I think the frame flexed enough to allow me to set things up pretty tight

  2. #2
    Join Date
    Dec 2011
    Location
    Piedmont, SD
    Posts
    728

    Default

    Mike,
    You'll see the racks are adhered with automotive trim 2 sided adhesive tape. I found this a bit strange at first, but the roughly 1/16" thick center is a sponge rubber composition which essentially acts as a very slight cushion, though not certain if that was the idea when selecting this method of attachment. While others may find it a bit over the top, after 5 years use and maintenance, I've developed a habit of using a "Quick Grip" squeeze trigger clamp torqued quite firmly to hold those motors up as I tighten them and their gears snug to the rack.

    Hope that helps, and hope others chime in with more technical prowess to confirm or correct my methodology.

    Jeff

  3. #3
    Join Date
    Feb 2013
    Location
    River Fall WI
    Posts
    796

    Default

    I was told just to push up hard.
    It has worked well for us.
    Kyle Stapleton
    River Falls Renaissance Academy
    Math/Technology Education Teacher


    PRS Alpha 96x60 2.2 hp spindle, Double Air drills, 6" indexer, Fein 5 zone vac table
    Desktop w/spindle
    Potter Pen
    Aspire 8.5, Creo 3.0

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