Operator`s manual

Advanced Haas Mill Programming Techniques Training Manual Page 39
G68 Coordinate Rotation
Coordinate Rotation or Coordinate System Rotation allows a program that is described by orthogonal
coordinates to be rotated along an axis. What this allows is a program that is described by axis
perpendicular to each other to be machined at an angle. In the G17 mode the plane is described by X and Y
coordinates in a typical top view drawing. With coordinate rotation a program may be simpler to create
with these coordinates than refiguring the X and Y coordinates if the part is rotated when machined. See
example below:
The above shows a top view drawing where center locations of pocket and bolt hole positions may be easy
to calculate and write into a cnc program.
The first print was rotated 10 degrees counterclockwise around the lower left hand corner. As may be seen
the X and Y coordinate calculations for the various features become complex and require the use of
trigonometry functions.
Note: With Haas vertical machines Coordinate Rotation (G68) and Scaling (G51) are options that need to
be purchased. However if the Haas vertical machine was purchased with a Renishaw Wireless Intuitive
Probe System, Coordinate Rotation and Scaling are included.