Dimensional Notation
Dimensional data can optionally be referred to an absolute origin or to the current set value.
Absolute dimensions
Command | G90 (standard setting) |
Cancellation | G91 |
All positional data in absolute dimensions are always given with reference to the currently valid origin.
In terms of tool movement, this means that, under absolute dimensioning, it is the position to which the tool should move that is described.
Incremental Dimensions
|
Command |
G91 |
|
Cancellation |
G90 |
When dimensions are incremental, positional data is related to the immediately preceding point. In addition to the path axes, the auxiliary axes (Q1..Q5) are also taken into account.
For the tool movement this means that the incremental dimension describes by how much the tool is moved.
Units
The units for length, angle etc. are described in the following table:
|
|
Unit |
|---|---|
|
Positions and lengths |
mm |
|
Angle |
degree |
|
Times |
sec |
|
Feed |
mm/min |