[Piecedtogether]

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.

[Piecedtogether]

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?

[machinehop5]

...Tripod CNC?
https://hackaday.com/2011/06/16/tripod-cnc-plotter/

...or maybe a Pentapod?
https://www.iws.fraunhofer.de/conten..._en_S36-37.pdf

[Piecedtogether]

...Tripod CNC?
https://hackaday.com/2011/06/16/tripod-cnc-plotter/

...or maybe a Pentapod?
https://www.iws.fraunhofer.de/conten..._en_S36-37.pdf

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.

[peteeng]

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

[StrawberryBoi]

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.

[peteeng]

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/

[StrawberryBoi]

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!