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  1. #101
    Quote Originally Posted by JAZZCNC View Post
    Don't waste your time, the way you have it now will work fine, that's exactly as I do them. It's simple and works. If I was to make a suggestion it would be to move the switch onto the side, fastened to the ballnut bracket and use the top slot for targets. How you have it now leaves the switch wide open to debris when cutting and if you cut steel or aluminium then could get false triggers when blasted with chips. Also the crap from cutting aluminium with lube can build up on the sensor.
    Thanks for the suggestion. I will check the feasibility of moving the sensor to the ballnut bracket! I was also thinking that for fine adjustment with this simple setup, one could use a dial indicator when adjusting the target.

    Quote Originally Posted by JAZZCNC View Post
    Again exactly as I do them and they work fine, the round head doesn't cause any issues. The only suggestion I'd make is to stiffen up the bracket. The one I use are 3D printed, You can just see it between the mass of pipes and wires in this pic.

    Attachment 27671
    Looks good.I think I could make a stiffer bracket out of aluminium without any problems. That X-axis ballnut bracket looks interesting. If I am not mistaken I would think you are using a rotating ballnut. Any chance I could get a closer look at that?

  2. #102
    Quote Originally Posted by Kitwn View Post
    For users of LiunuxCNC with the option to auto-square the gantry it is essential that the switches cannot overshoot their targets during deceleration and reset themselves before the whole sequence is finished. In this case you may need a larger target, especially with a large and heavy gantry.
    I see, I didn't know that! Luckily I will be using Mach3! If I still need a bigger target for some reason then I can lathe a new target.

  3. #103
    Quote Originally Posted by NordicCnc View Post
    I see, I didn't know that! Luckily I will be using Mach3! If I still need a bigger target for some reason then I can lathe a new target.
    The devil is always in the detail.
    Engineering is the art of doing for ten shillings what any fool can do for a pound.
    Wellington.

  4. #104
    Quote Originally Posted by NordicCnc View Post
    Thanks for the suggestion. I will check the feasibility of moving the sensor to the ballnut bracket! I was also thinking that for fine adjustment with this simple setup, one could use a dial indicator when adjusting the target.
    You won't need to adjust it to that degree. I don't use Linux CNC but believe it just works like any other gantry squaring routine in that it sees the switch and you tell it in software how far from the switch you want it to move so it squares the gantry. The switch is just a trigger, the closer you get to square the better because your not loading the bearings, etc, but you don't need it to be to the micron.!

    The size of the target shouldn't make a difference if the switch distance is set correctly. What a larger target does allow is more room for clearance, basically, it allows more room over shoot, which you don't want anyway because of the twisting gantry.
    Also if you are using Servo's then it's all immaterial because you'd use Home-to-Index, so again you just using the switch like a trigger, then the servo will Index to the Encoder.



    Quote Originally Posted by NordicCnc View Post
    Looks good.I think I could make a stiffer bracket out of aluminium without any problems. That X-axis ballnut bracket looks interesting. If I am not mistaken I would think you are using a rotating ballnut. Any chance I could get a closer look at that?
    Yes I used to make them out of aluminium but I prefer to 3D print them now because if anything hits them the bracket snaps off and saves the switch. The bracket is strong enough so it doesn't flex causing false triggers etc but yet weak enough to snap if thumped with somthing heavy.

    Regards the Rotating Ballnuts then yes your right. All Axis except Z-axis are using rotating nuts but I cannot take any claim for the design, Jonathan designed them and kindly allowed me to use.( I actually bought some of the parts from him and made the others) If you search the forum you'll find a thread about them.

    Click image for larger version. 

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