Play in pen lift hinge



  • Is anyone having problems with play in the pen lift hinge I am finding a lot of play and the small spring does not seem able to cope. I have made a new arm and used a 3mm pin in a reamed hole which is a lot better but still not perfect. I am thinking of trying a version with two small bearings in the arm and two pointed set screws to sit in the bearings. Has anyone got any other good ideas. 0_1492956507312_image.jpg


  • Active Member

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  • Developer of T2Laser Software

    I disagree about holding the pen down, it is much better to allow gravity to follow the shape (it could be assisted by a small spring but I haven't found it necessary, yet).

    On my machine at least, the small spring in the arm limits any play but the pen holder does need some improvement - mainly because it doesn't hold most pens very well.


  • Active Member

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  • Developer of T2Laser Software

    The Z-axis adjustment is the pen itself, just set it so the pen is vertical when down. I don't see the need for more complexity (which typically means cost).


  • Active Member

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  • Thanks for all the ideas. I have not had a problem with pen adjustment yet as all my trials have been with the same size ping pong balls. I can imagine there could be an issue with the taper on the pens and it would not be hard to change the vertical pen arm to have a slot and thread two holes in the disc that goes on the stepper, I might give it a go on my next attempt. The plastic springy servo connector is interesting but I can see problems forgetting to set the correct S value and giving it a good stretch, I am playing with a few different bits of software to generate the gcode and in some I have to replace the Z moves with the correct S values. so far I have not had a problem with the pen going down and have tried a golf ball and it coped with the dimples ok, being aluminium and not plastic it has some weight to it. My major problem was with the play in the hinge, I am getting acceptable results now with my new version but I am sure it can be improved on further. I am lucky that I have access to CNC machines at work so I can try these ideas out in my dinner times and as its all just a hobby the budget is not such an issue, if it helps improve future versions then that's even better.


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