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Table Drive Assembly

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  • Table Drive Assembly

    I have a machine that the table drive assembly will not "unlock" to set a full rack. You can take a screw driver and pry the lock out and it will set a full rack, but then when you cycle the machine to pick up the pins left standing, it locks back in. I replaced the table drive assembly with a brand new one, suprise this is not the problem, I have also checked for binding in the shuttle, spotting rod,& solenoid. It works fine as long as there is not pressure on the drive. Any suggestions?
    Remember no one is perfect no matter how good we are!

  • #2
    Re: Table Drive Assembly

    Check the pin that trips the eccentric on the table drive.....the roll pins break and or the pins get the holes egged out and the do not provide pressure on the latch sufficient to allow the eccentric to unlatch.

    JK

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    • #3
      Re: Table Drive Assembly

      Just last week I had a table doing the same....every thing looked ok...removed the clevis and the bearings went all over the deck. Replaced them and all "A" OK.

      Charlie [img]/content/btubb/images/%%GRAEMLIN_URL%%/smile.gif[/img]
      Please buy MADE IN USA!

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      • #4
        Re: Table Drive Assembly

        King's probably nailed it... the lever has some wear, the torsion spring is weak / broken, or the roll pin/pinway is worn or broken. Any one of them can cause the lever to stay locked in.

        Also, don't forget about the "table zero" adjustment... we would set ours with the leading edge of the block just a hair off of flush with the drop-in point on the hub (about 355 degrees on the cam). If it's off, it can put enough pressure on the block to hold it from popping back up. The "quick and dirty" way to check table zero is to make sure that the at the beginning of a table run, it travels very slightly UP before running down to spotting or respot.

        Make sure that the block, the notch in the hub, and the lever isn't loaded with grease...ESPECIALLY old grease. Sometimes (especially on the older levers that have weaker or age-fatigued springs) the grease gets in there and acts like glue... it holds the lever down hard enough that the spring can't overcome it.
        <span style="font-style: italic">Educatio est omnium efficacissima forma rebellionis</span>

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        • #5
          Re: Table Drive Assembly

          KING, you would have thought the roll pins would not have been broken in BOTH table drives, especially as one is a brand new one.

          Problem well explained by Gman. Table cams out, overshooting latch (table not stopping at 355 degrees), or table drive over greased causing a vacuum.

          HAMMER

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          • #6
            Re: Table Drive Assembly

            One year ago, we experienced the same problem in our house.
            The latch on the eecntric of one of our lanes didn't engage.

            The problem was in the pulling assembly under the solenoid. The two T shaped metal plates in the spring were worn.
            Through this, the cam lever had too little pressure, or gave it for a too short time, to activate the latch on the eccntric.

            Replaced, problem solved.

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