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    Member Piecedtogether's Avatar
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    Default Motion control

    1st post so please forgive me. I have a concept for a cnc machine (could be a router 3d printer ECT) it would have the xy plane move up and down together to form the z axis. Similar to a core xy machine without the belt system. I'm sure this has been done before but I can not get the terminology right to find information. Thank you for your time.

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    Quote Originally Posted by Piecedtogether View Post
    1st post so please forgive me. I have a concept for a cnc machine (could be a router 3d printer ECT) it would have the xy plane move up and down together to form the z axis. Similar to a core xy machine without the belt system. I'm sure this has been done before but I can not get the terminology right to find information. Thank you for your time.
    Does anyone have suggestions on what this type of configuration would be called?



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    Last edited by machinehop5; 06-27-2021 at 05:15 PM.


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    Member Piecedtogether's Avatar
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    Quote Originally Posted by machinehop5 View Post
    Thank you for your response. Those are some interesting designs but mine would be a cartesian machine. I'm probably not doing a very good job of describing the concept. The XY plane moves up and down together to form the Z axis. Probably would have 4 corner posts to travel vertically.



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    Default Re: Motion control

    Hi Pieced - Its called a lifting gantry machine. Does not need 4 posts can move up and down on two columns. Very large mills (the size of a small house say) do this some have moving Z and lifting Z as well. The Milli thread describes the design of a lifting gantry machine... there are a couple of threads on this type of machine.

    https://www.cnczone.com/forums/verti...14840-cnc.html

    https://www.yogiemachinery.com/news/...-10660851.html

    cheers Peter



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    Quote Originally Posted by peteeng View Post
    Hi Pieced - Its called a lifting gantry machine. Does not need 4 posts can move up and down on two columns. Very large mills (the size of a small house say) do this some have moving Z and lifting Z as well. The Milli thread describes the design of a lifting gantry machine... there are a couple of threads on this type of machine.

    https://www.cnczone.com/forums/verti...14840-cnc.html

    https://www.yogiemachinery.com/news/...-10660851.html

    cheers Peter
    The big Bridgeport mills are like this, right? The manual ones have the big crank on the left for the table Z and then there is the spindle plunge. Table has all the x-y.



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    Default Re: Motion control

    Hi Strawb - A bridgeport with a "knee" usually does not have the bed under control to go up and down. The knee is used for coarse adjustment of the z height then its locked off. The spindle or head then goes up and down for machining purposes as you say. But rereading the question I think piece wants the bed to go up and down like on some printers. Thats OK for printers but moving the bed and the other axis is not very stiff for a cutting machine. Peter

    https://makeitfrommetal.com/whats-a-...ginners-guide/



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    Quote Originally Posted by peteeng View Post
    Hi Strawb - A bridgeport with a "knee" usually does not have the bed under control to go up and down. The knee is used for coarse adjustment of the z height then its locked off. The spindle or head then goes up and down for machining purposes as you say. But rereading the question I think piece wants the bed to go up and down like on some printers. Thats OK for printers but moving the bed and the other axis is not very stiff for a cutting machine. Peter

    https://makeitfrommetal.com/whats-a-...ginners-guide/
    Ah, good to know. Interesting... that really limits the machining height under control of the knee then. The first Bridgeport I ever encountered was a Heidenhain converted CNC with some weird Heidenhain proprietary code that you entered only via the control screen. Now that I think of it, if I moved the bed height I did have to re-zero and the digital readouts also didn't account for it.

    Thanks pete!



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