Coordinate Systems

There are three different coordinate system (CS) types:

  • Machine (MCS)
  • Axes (ACS)
  • Product/Program (PCS)

Figure 6-1: Examples of CS types on a machine and part.

  • Many coordinated moves may be done in a choice of coordinate systems.
  • The differences between the types are offsets and possibly transformational algorithms to convert between the different systems, which ultimately control the actual axes on a piece of machinery.
  • Example:
    • The X-axis of a Machine CS is meant to command a pair of Axes CS axes (X1 and X2) which together form a gantry.
    • The relative movement of the MCS X axis would be added to both ACS axes.
    • The two ACS axes can be commanded independently for minor alignment adjustments.

  • The Product Coordinate System is often rotated and/or offset from the Machine Coordinate System.