Amada Guillotine GS 1230 back stop issues
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  1. #1
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    Default Amada Guillotine GS 1230 back stop issues

    Anyone had experience with Amada guillotines? we have one in our shop and the back stop keeps going out of calibration. it can all of a sudden be 5mm out from side to side, we adjust it back into square then fine for a while but it happens again. We've marked the pulleys at the rear to see if they are jumping but they appear fine unless it jumps a complete turn exactly. other than that it's getting to be a right PITA.
    Mike

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    There's also an issue with one of the softkey panels and the button sticks, it looks like the whole panel needs replacing to sort this out 😣

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    How does it home? We had a press brake servo that jumped in complete turn increments. It turned out to be a bad connection between the encoder and the controller. This particular system had a not very accurate home switch to get it roughly positioned, then the servo hunts for an index pulse that the encoder spits out once every turn.

    Important to know on these systems is that turning the pulley at all when replacing the belt will change the home position.

    Also important, the home switch must be a certain angle away from the index mark, typically 90 degrees each way at least, so that the index doesn't appear before the switch one day and after the switch another day if they occur nearly simultaneously.

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    When the machine is powered on the back stop travels out to full stroke backward and hits a micro switch, this is a know size set on the panel and it keeps track of the distance travelled from there. this seems to work fine it cuts the right size at the squaring bar end, it's the other end that goes out of size. like the two ball screws at either side on the back stop go out of sync but we have checked may times. when we set it we put a straight edge across the two pulleys and scribe a line across and it always appears to line up so the belts not jumping but occasionally it goes off line. we cant see movement between the backstop bar and the ball screws so not like it's slack anywhere. and it's like a full turn to the pully on the ball screw to line it back up again.

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    So the two screws are driven by a single motor?

    Check the pulley isn't skipping on the keyway. That can happen if the setscrew is driven into the keyway with no key installed.

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    Quote Originally Posted by Strostkovy View Post
    So the two screws are driven by a single motor?

    Check the pulley isn't skipping on the keyway. That can happen if the setscrew is driven into the keyway with no key installed.
    The shaft and pulleys are properly secure with good fitting keys, when I mention above about scribing a line across the pulley this includes the shaft and nothing appears to be moving on the scribe lines.
    I’m beginning to second guess the ball screw nuts, is there a chance they can jump or can they be prone for problems? There is no play anywhere but is it possible if there is a ball missing at one side it can move differently to the other side? I don’t know if there is a ball missing or there is a problem but running out or things to look at. We had to adjust it again today.

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    Ball screws are back drivable. With the motor mechanically disconnected (or left in place depending on gear reduction) give the backgauge a good shove. If it backdrives, then the uts should be fine. If they jump, then you certainly have a problem.

    I have used ball nuts that spilled their contents all over the floor and went together half full without issue, but those never saw much load.

    Also worth checking your operators aren't doing anything stupid that's causing to get shot out of adjustment. Is it the side nearest the square edge of the table that gets messed up?


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