R Function; Understanding The Coordinate System; Coordinate Example - Easson ES-12 Operation Manuals

Understanding the Coordinate System :

For those operator whom don't have experience in CNC programming, or the first time user of the ES-12's
R function, they may find that it is difficult to understand what is coordinate.
The coordinate is a pair of unmber which specify a position.
When using the ES-12's R function, it is necessary to enter the coordinates of ARC's center, start point, end
point and etc.. to let the ES-12 knows the geometry of the ARC ro be machined.
During installation of the ES-12, normally the service engineer will set the display direction same as the dial
of the machine. For a typical knee type milling machine, the lead screw dial direction are as follows,
therefore, DRO's display direction are also normally be set to the direction as per follows.
Y (+positive direction)

Coordinate Example

Coordinate is a pair of number which specify the distance from the datum point ( ZERO position ), the
number can be either be positive or negative depend on it's relative direction from ZERO position.
X (+positive direction)
Y (+positive direction)
X (+positive direction)
Z (+positive direction)
datum point
(zero position)
(0,0)
30
12
30
datum point
(zero position)
(0,0)

R function

50
Example 1
50
Example 2
- 40 -
-- NOTICE --
Coordinate have
signs to specify it's
relative location
from ZERO
A coordinate : ( +30.0, +20.0 )
B coordinate : ( +50.0, +40.0 )
A coordinate : ( +30.0, -40.0 )
B coordinate : ( +50.0, -20.0 )
please notice than the Y coordinate
is negative because it located at
the negative direction from the
zero position