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Sweep adjustments


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  • Sweep adjustments

    Hey guys,

    I have two sweeps that I cannot get the sweep height adjusted correctly. When the sweep is at zero it should rest an inch or less away from the frame. When when these two sweeps are adjusted correctly, so that they will knock all the pins off the back row, the sweep is hanging down about three or four inches. Any ideas on this one. The rod lengths seem to be colse to tolerance. I know that when you adjust one the other two are affected.

    I know it is a small problem but these two are driving me nuts! [img]/content/btubb/images/%%GRAEMLIN_URL%%/mad.gif[/img]

    Let me know. I hope everyone's summer is going well.


  • #2
    Re: Sweep adjustments

    When you adjust the sweep to run back far enough, this usually causes you to have to adjust the two longer rods (one on each side) to raise the sweep at zero. Each side of the sweep is adjusted independantly, so you will have to adjust both of them. Turn the rods untill the sweep is up where you want it. However, if the sweep is not hanging below the masking unit, I wouldn't worry too much about it, because it's not going to cause a problem.
    Give me a hammer and some duct tape and I can fix it!


    • #3
      Re: Sweep adjustments

      Worst case scenerio you could always add 'pac-man' washers under the bumpers. [img]/content/btubb/images/%%GRAEMLIN_URL%%/smile.gif[/img]


      • #4
        Re: Sweep adjustments

        After you set the run length, did you readjust the two 'crackpipes' on the left and right frames where the pump arms attach? You can also move the cams to adjust your stop, start, and zero positions.
        <span style="font-style: italic">Educatio est omnium efficacissima forma rebellionis</span>


        • #5
          Re: Sweep adjustments

          I've ironed out this problem a couple years ago. Here's the formula for increasing or decreasing the total sweep stroke so you can get the pins off the lane (farther back) AND get it up at zero.

          To increase stroke:
          Lengthen the short drive rod (1/2" motor connecting rod) and shorten the two long tie rods.

          To decrease stroke:
          Shorten the short rod, lengthen the long rods.

          Do this after setting the height you want. I prefer 1/4" from the cross beam's rear bolt. For whatever amount you turn the short rod, turn the long ones the same amount, until you get the feel of this procedure.

          NOTE: If you have a sweep that goes too far into the pit AND too high up, and you cannot shorten the 1/2" rod any more, replace the crank probably have a very early version, with the rod end bolt hole in the center of the machined end surface. The distance between the center of the two holes in the crank arm has been reduced on "B" and later machines. [img]/content/btubb/images/%%GRAEMLIN_URL%%/wink.gif[/img]


          • #6
            Re: Sweep adjustments

            Thanks for the advise guys. BowlEquip
            your tip worked. What a process, this took some time but I feel it has been worth the effort! Thanks BowlEquip and all.

            [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] See ya in the back end.

            [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img] [img]/content/btubb/images/%%GRAEMLIN_URL%%/laugh.gif[/img]


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