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Inaccurate path

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Chadwick Dockstader

Hello Experts , 

I have a welding fixture and programmed the welding path accordingly. After running the production cycle for few days , I always required to reteach the points or adjust the fixture in order to do the welding at the accurate portion. I have checked all the parameters even increased the cycle time at the few portion of welding by decreasing the speed. I have also made the fixture more rigid so they dont move during welding. But no luck. 

Can anyone help me with it. Do i need to change any parameters or anything can be done to improve. 

Thanks a bundle. 

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3 comments

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    iqra arshad
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    Dear Chadwick,

    Please state which Robot, Controller & process you are using, It would be easier to help then.

    Best!

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    Sarwat Anjum
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    Dear Chadwick,

    Here I am stating few common points that you could consider while troubleshooting;

    1. Check for backlash by releasing the brakes of all axis one by one. This means you should be able to move the axis and feel the same (constant) amount of torque (resistance) when doing this. It should felt like more or less constant resistance throughout. In case you feel a low resistance initially changing into higher resistance when you rotate more you have got a problem in the transmission. 
    2. Check motor mountings, once I encountered same issue and it was probed that the bolts for fixing the one of the axis motor where lose.


    Good luck !

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    Chadwick Dockstader
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    Hello , 

    iqra arshad - R30iB

    Sarwat Anjum - I see. I think the reducer / gear system is worn out. We have never changed since we purchased the robot. We have many robots. I was also thinking to use TAST system. But firstly i will perform gear changing on one of robot and see how things go. Then for better accuracy will check TAST feature. 

    Thanks a lot guys. 

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