G91 Incremental Coordinates
Code Practice
Lesson 3, pgs 6-10
OBJECTIVE
After completing this unit, you should be able to:
- identify incremental movements
Incremental Coordinates
Definition:
increment: the amount that something changes.
Incremental Coordinates do not use the point of origin or the part datum to move the CNC machine to the next position. These coordinates reset to (0, 0) after every point. The next position is calculated starting at (0,0).
Incremental Coordinates are modal and will cancel absolute coordinates.
Yes, it is a coordinate system. It can still move the CNC machine to any position. The difference is how the CNC machine measures the distance to the next position.
Watch this 5:20 video “G90 vs G91 – The difference between absolute and incremental positioning”
https://www.youtube.com/watch?v=pTZLVYdtnrA
Practice
Adapted from MCC AMT110 2 Triangle Puzzle by Ed Ely is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/deed.en_US
