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  • dropping pins

    A lane drops either the 6, 7, or 10 pin. Visual inspection of the pincups, pins, spotting and yoke etc all look to be ok. The lane isnt doing it every time, and i am a bit baffled as to what it could be.

  • #2
    Have you checked the tie rod (zig-zag) connecting the shafts on the 'X' frame? If this is bad (especially if it's worn at the #1 shaft) it can cause intermittent problems along the back rows as you describe....

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    • #3
      when having a look at the rods, bars etc we found a crack in the yoke, so sorting this out will be top priority, then if things are still going wrong we will go from there.

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      • #4
        Hmm, cracked yoke, that might be why, but I guess it depends on where the crack is and how bad it is. If it's not that then could there be issues with the pin bottoms, respot cells in that area of the table, distributor/bin perhapse?

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        • #5
          Originally posted by Tablejam View Post
          Hmm, cracked yoke, that might be why, but I guess it depends on where the crack is and how bad it is. If it's not that then could there be issues with the pin bottoms, respot cells in that area of the table, distributor/bin perhapse?
          Agreed. It's possible a cracked yoke could cause these problems, but that may not be the case here (when I started at my latest center I noticed 4 lanes that had badly broken 'X' frames....all working just fine. Scary!). As Tablejam says...badly adjusted respot cells could also cause that problem. Do you have a camera available? If so, it'd be interesting to record that machine and be able to watch/know for certain exactly what's going on.......

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          • #6
            If its always the 6,7,10 try changing the cups and see if problem goes away.
            If it cant be fixed with a hammer, use a bowling pin.

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            • #7
              Have you used the cup gauge to check those cups?

              Do this:
              http://www.bowltech.com/forums/showt...table-spotting

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              • #8
                How is the pin falling, forward, backward. That would give an idea off what to look at. Also if something looks good doesnt mean it is. I had one pin kept dropping. everything checked ok until i replace the cup. found out it was slightly warped.
                amf 82-70
                B2000
                quibca

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                • #9
                  There is a field repair kit for the Yoke, can't think of the number off hand. Just a thought, is your table toed a bit too much. Also, depending on your table towers, check to make sure that they are proper tight to the table.
                  Necessity IS NOT the mother of invention. Laziness IS the mother of invention.

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                  • #10
                    Originally posted by clutchplate View Post
                    If its always the 6,7,10 try changing the cups and see if problem goes away.
                    Yeah, move these cups to the other side of the table and see if it follows, or maybe, sometimes, the problem will just go away.

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                    • #11
                      If the pins wobble throughout the rack, even after you adjust it, the torque tube bushing on the 7 side is also a common culprit. I still find it hard to believe, but a crack in that bushing causes a TON of wobbling and falling pins.

                      Toby
                      82-70B, Stepper chassis
                      www.mooseexchange.org

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                      • #12
                        Makes sense Toby here's why....

                        A crack in that bushing allows slop where the torque tube pivots in there. During spotting the table is pulled upon by the spot rod, any slop in there allows not only the table to move or shift but can also cause some loss of 'drive' of the spot rod.

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                        • #13
                          Thanks for all the response guys, you really do know what your talking about, thats why this site is great!

                          Another technician took the yoke off, it did have a repair kit on it but the crack was quite close to a bearing so i guess there would be more vibration in this area perhaps?

                          We will inspect all the various components that come off with it and replace anything that looks slightly worn/warped/iffy. Fingers crossed this will work

                          Thanks again guys

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                          • #14
                            Even with the repair kit on the yoke if the yoke is together right and the kit is tight, it should still work fine, maybe the kit was loose?

                            With a different yoke on this table if this continues then it's time to start looking at other things like table support bearings/bushings, bolts, rod ends, positioning, level, etc. Worn or loose parts can cause irritating things to happen like this.

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                            • #15
                              Agree with TJ. I have found that field repair kits work great, but the closer a crack or break gets to the bearing, the worse it gets, and you just have to get a new yoke no matter how much "weld" is piled on with a trowel.
                              Necessity IS NOT the mother of invention. Laziness IS the mother of invention.

                              Comment

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