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G90 AND G91 - DISTANCE MODE

Table Of Contents:
  1. G-code Table
  2. G00 - Rapid Linear Motion
  3. G01 - Linear Motion at Feed Rate
  4. G02 and G03 - Arc at Feed Rate
  5. G04 - Dwell
  6. G10 - Coordinate System Data Tool and Work Offset Tables
  7. G17, G18 and G19 - Plane Selection
  8. G20 and G21 - Length Units
  9. G28 and G30 - Return to Home
  10. G28.1 - Reference Axes
  11. G40, G41 and G42 - Cutter Radius Compensation
  12. G43, G44 and G49 - Tool Length Offsets
  13. G47 - Engrave Sequential Serial Number
  14. G53 - Move in Absolute Coordinates
  15. G54 to G59 and G59 P~ - Select Work Offset Coordinate System
  16. G61 and G64 - Set Path Control Mode
  17. G73 - Canned Cycle - High Speed Peck Drill
  18. G80 - Cancel Modal Motion
  19. G81 to G89 - Canned Cycles
  20. G90 and G91 - Distance Mode
  21. G92, G92.1, G92.2 and G92.3 - G92 Offsets
  22. G93, G94 and G95 - Set Path Control Mode
  23. G98 and G99 - Canned Cycle Return Level 
Details:
Interpretation of the CS-code can be in one of two distance modes: absolute or incremental.
To go into absolute distance mode, program: G90. In absolute distance mode, axis numbers (X, Y, Z, A) usually represent positions in terms of the currently active coordinate system. Any exceptions to that rule are described explicitly in this section describing G-codes.
To go into incremental distance mode, program: G91. In incremental distance mode, axis numbers (X, Y, Z, A) usually represent increments from the current values of the numbers.
I and J numbers always represent increments, regardless of the distance mode setting. K numbers represent increments.

* G90 Example 
(Sample Program G90EX21:)
(Workpiece Size: X4, Y3, Z1)
(Tool: Tool #2, 1/2" Slot Drill)
(Tool Start Position: X0, Y0, Z1)

N2 G90 G80 G40 G54 G20 G17 G50 G94 G64 (safety block)
N5 G90 G20 (Set to absolute mode)
N10 M06 T2 G43 H2
N12 M03 S1200
N15 G00 X1 Y1
N20 Z0.125
N25 G01 Z-0.125 F5
N30 X3
N35 Y2
N40 X1
N45 Y1
N50 G00 Z1
N55 X0 Y0
N60 M05
N65 M30


* G91 Example

(Sample Program G91EX22:)
(Workpiece Size: X4, Y3, Z1)
(Tool: Tool #2, 1/4" Slot Drill)
(Tool Start Position: X0, Y0, Z1)

N2 G90 G80 G40 G54 G20 G17 G50 G94 G64 (safety block)
N5 G90 G20
N10 M06 T2 G43 H2
N15 M03 S1200
N20 G00 X1 Y1
N25 Z0.125
N30 G01 Z-0.125 F5
N35 G91 X1 Y1 (Set to incremental mode)
N40 Y-1
N45 X1
N50 Y1
N55 G90 G00 Z1
N60 X0 Y0
N65 M05
N70 M30

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