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Introducing the PK1 1/2 scale pinsetter

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  • Introducing the PK1 1/2 scale pinsetter

    Click image for larger version

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ID:	1066207Well not the whole pinsetter yet but the start of it. I finally have something that I think is worthwhile to show. I have been working on my new finger design. To say it was challenging is an understatement. I had to give up making the parts myself and have them professionally machined. Even that wasn't enough though. I had to also experiment with different materials to use for the yolk, which I'll get into in a second.

    If you want a re-cap on what I have done previously, you can visit this thread: http://www.bowltech.com/forums/showt...have-questions

    Now onto the new stuff.

    I have been working on a new finger design. Due to many issues with the previous design, I decided to have the fingers professionally machined. This is what they look like: They are made out of brass and while they need some dimensional tweaks, they are pretty close to what then final design is going to be. Pictured here you can also see the yolk that actuates the fingers. It is attached to a guide arm which is attached to a drive link. The link slides back and forth. Here is a video showing how it works:

    The problem I had with the original design is that I tried to use a material called alumilite to cast the fingers so I could quickly reproduce them. It turns out the alumilite has some give to it but I could not really see it going on, which was causing me many headaches. The issue I was having was that when a pin was near the inside of the fingers, everything worked fine. However, when a pin was at the out side of the fingers, it wanted to fall out. This new design eliminates that. As I mentioned above, I have tried some different materials while trying to put this all together. I thought I could use various plastics but it turns out good old fashioned metal is needed, thus the fingers and yolk are made out of brass. They seem to work very well. Notice in this picture that the pin is to the inside of the fingers: Click image for larger version

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ID:	1066208 Now compare to this picture where the pin is to the outside of the fingers: Click image for larger version

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ID:	1066209 Notice there is only a small difference in how the pin is held by the fingers. Compare where the red stripe is to see what I mean. I could not get my old fingers to do this. This design also has a switch built in, as did the original. This switch will be used to signal the PLC that a pin has been picked up.

    I have also been working on a new cup design. The original cups held the pins by their necks. I did this because I wanted a really simple design and did not want to have to build something which moved the cups away from the pins like happens on an AMF machine. I had many issues with that design too. Now that I have re-thought things, I have decided to go with moving the cups away from the pins, as well as holding the pins by their belly's. I have come up with a simple way to move the cups, which I'll show when the time comes. As for the cups, this is what they look like: Click image for larger version

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ID:	1066210 Here it is with a pin in it: Click image for larger version

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    As for the state of the old pinsetter, here it is: Click image for larger version

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ID:	1066212Click image for larger version

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ID:	1066213 The old frame design won't work for what I'm now planning, so I took most of it apart. All the sweep components have been kept and will be re-used on the new machine because it ended up being such a simple design.

    That's it for now. I'll give another update early next year when I hopefully have a mock-up of the table to show.
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