G Code Help

[alex2385]

Hi everyone.

Right now I'm programming a post-processor than can draw the movements of the machine tool with the graphic interface of matlab. However, i need to know if there exists a specific G code command (like G00, G01, G03, G20, etc.) that enables me to draw an inclined plane. I know it is possible to do so simply by the standard straight line instructions (G00 and G01) and with the coordinates in the space of such lines (x,y,z), but i need to know if it is possible to define a plane (xy, xz or yz) and then rotate it by theta degrees around an axis in particular.

For example, if there exist a comand like the next one i would like to know:

G## T## A(X, Y or Z) X## Y##

where G## is the command, T## is the angle theta that the plane will be rottated, A is the axis around it will be rotated and X and Y are the coordinates of the plane that will be rotated (it could be aswell X## Z## or Y## Z##).

Thanku...

[Al_The_Man]

Originally Posted by alex2385 Hi everyone. I know it is possible to do so simply by the standard straight line instructions (G00 and G01) and with the coordinates in the space of such lines (x,y,z), ..

Keep in mind that G00 is not a straight line instruction, IOW it is not an interpolated move as is G01.
With G00, the axis will perform random path, depending on the relative distance for each axis, from origin to destination.
Al.

[Karl_T]

many or most controls don't have this feature. Its set up as G140 on my Camsoft Pro control.

Karl

[thogib]

Some FANUC controls have a "G54.2 Pn" rotary work offset shift, that can shift your offset around, a possible, 3 axis. I haven't tried it, much easier to shift the part in the computer and repost the program.

[alex2385]

Thanks guys.

However, what i really need is:
Having an arc or circular interpolation (no matter if is CW or CCW), can I rotate and/or translate it to a general plane in space different than the standar XY, ZX, YZ achivied with the G17, G18 and G19 commands?

Thanks again, i never realise how helpful this forums can be...

[CNCgr]

Originally Posted by alex2385 Thanks guys. However, what i really need is: Having an arc or circular interpolation (no matter if is CW or CCW), can I rotate and/or translate it to a general plane in space different than the standar XY, ZX, YZ achivied with the G17, G18 and G19 commands? Thanks again, i never realise how helpful this forums can be...

First of all a postproccessor is machine specific, i.e. it has to be custom made for machine X and the code it produces may not run on machine Y. You have to decide what machine you want it for, what commands it supports and start from there.

A more "universal" approach would be to produce APT code and then make a post to convert that to g-code (or use a ready-made post as most of them input APT). However I can't help you with that, I've never gotten much into APT.

That been said, there are ways to work on inclined planes. On HAAS machines (I think Fanuc too) you can use G68 with G17-19 to rotate the XY,XZ or YZ planes. You have to specify the rotation point coordinates and the angle of rotation.

Nikolas

[lakeside]

G68 will do this and if the machine has coor./scaling G68 is a standerd EIA code