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• 1 Chuckee // Nov 29, 2008 at 10:01 pm

  Relative coordinates is a point from where the position is right now to where you want to go. Absolute is to move to a new location from an absolute zero point on the machine.

  Example:

  Lets say that you are currently sitting at zero in X, Y and Z you need to move to X5.0, Y5.0 and Z5.0 then to X8.0 Y8.0 Z8.0 and then back to X, Y, Z zero.

  In relative programming it would look like this:
  X5.0 Y5.0 Z5.0 (sitting at this pos your next move is a relative increment to your next pos)
  X3.0 Y3.0 Z3.0 (You now moved an relative increment more than the last pos)
  X-8.0 Y-8.0 Z-8.0 ( Back to the start)

  In absolute programming the same motion looks like this:
  X5.0 Y5.0 Z5.0 (pos 1)
  X8.0 Y8.0 Z8.0 (pos 2)
  X0.0 Y0.0 Z0.0 (pos 3 back to the start)

  Humans tend to think in relative incremental terms. When you give driving directions it is always in relative terms, go north 1 mile (km) from there go east 2 miles (km), etc.

  In CNC programming it is much easier to program in absolute mode because you always know where you are at just by looking at the current command from the zero point on the machine.

  In relative programming you would need to add or subtract all of the previous moves to figure out where you are at.

  ]-)

  Good Luck,\

  .

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