coordinate system

[kiethnt]

Dear all,
I'm a newbie of G_code programmer, so any body can explain detail about coordinate system that are using in CNC Milling machine. How many type of coordinate system using in CNC machine? What type of coordinate is refered to in G_code or whereis reference coordinate in G_code? Thank in advance all.

[Jarwalcot]

http://www.utm.edu/departments/engin...-%20Slides.pdf

[Al_The_Man]

If you do a search of Cartesian coordinates it will give the basis of the coordinate system.
With a mill the coordinate directions assume the Spindle is moving in all three directions, In fact in most cases the Spindle Z is the only one that moves, the table therefore has to move in the opposite X & Y direction to obtain the correct XY spindle referenced direction.
If you have used an osilloscope you may alread be used to the coordinate directions, where the X moves from - to + left to right, Y moves - to + upward and Z moves away from you in the direction of the image.
If you use this method by standing in front of the mill looking down on the table, the above directions will apply.
But remembering that the spindle probabally does not move in the XY means that the table will be programmed to move with the +- reversed in order to achieve the correct spindle orientation.
In a gantry mill etc, the spindle usually moves in all three directions and the table is stationary.
You write the program both the same way, the reversal direction is taken care of in the machine.
Al.

[dcoupar]

Kieth,

Which CNC mill? Which control? Fanuc is different from Fadal, etc. Tell us what you're working with, and we can help.

Dave

[Al_The_Man]

Originally Posted by dcoupar Which control? Fanuc is different from Fadal,

Although Fanuc do not dictate what is used, it is up to the MTB or Retrofitter to get it right.
Al.

[tobyaxis]

Originally Posted by kiethnt Dear all, I'm a newbie of G_code programmer, so any body can explain detail about coordinate system that are using in CNC Milling machine. How many type of coordinate system using in CNC machine? What type of coordinate is refered to in G_code or whereis reference coordinate in G_code? Thank in advance all.

The Machinery's HandBook has them in the 26th and 27 Editions. YOu can also download a trial CAD or CAM Software to get used to Programming using the Axial XYZ's.

Cheers!!!!!!!!!!

[afmcorp]

JR Walcott

very nice. is the 1st and 2nd class papers available for download.
tks
craig