Can I connect a servo to let a pin go up and down  

New Home Forum LowRider Troubleshooting – LowRider Can I connect a servo to let a pin go up and down  

This topic contains 6 replies, has 4 voices, and was last updated by  Ryan 3 weeks, 1 day ago.

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  • #106521

    Dennis
    Participant

    I would like to draw with my lowrider. the z axis is too slow to draw much. I don’t think it is necessary to let the whole lowrider go up and down, while he only needs to lift a pen quickly. How can I make this with a mini rambo?

    #106549

    Tim
    Participant

    Would it not be acceptable to just tell Estlcam to raise the pen less between moves? So instead of going up 25mm (for example) it only goes up maybe 3mm?

    #106575

    Ryan
    Keymaster

    I use about 1.5mm.

    #108085

    Greg
    Participant

    I added a servo to my lowrider to swing out a sensor for Z homing.  It was surprisingly easy.  The min endstop pins are the only ones that do PWM so you if you are using min endstops you need to first remap one to the max connector then use the min endstop connector to control your servo.

    See here: https://reprap.org/wiki/MiniRambo#PWM_Pin_for_a_Servo_.28pin_remapping.29

    and here: https://github.com/tonokip/Marlin/commit/f53b6f272d524b99b3c99282c8671416c7dc10db

     

    #108101

    Ryan
    Keymaster

    That is how 3D printers used to do it. For CNC you should be using a touch plate so you know where home is in relation to your end mill tip.

    #108105

    Greg
    Participant

    That is how 3D printers used to do it. For CNC you should be using a touch plate so you know where home is in relation to your end mill tip.

    I use the end mill tip to home the Z on a pressure disc then offset from that based on the thickness of my material… I have buttons configured in cnc.js for 1/4” 1/2” etc.  That way I’m not messing around with touch plates and alligator clips.  Seems to be accurate and I can just rehome the Z if I have a tool change.

     

    #108106

    Ryan
    Keymaster

    Nice!

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