9
Fig. 3-1
3.2 Setting Unit
3.2.1 Minimum Setting Unit and Minimum Travel Unit
1) Minimum setting unit
2) Minimum setting minimum unit by the amount of movement of the tool command input, these minimum
unit in millimeters (mm), inches (inch) are given.
3) The minimum mobile unit
4) Enter the smallest mobile unit to the machine in millimeters, inches or degrees, may be any one of the
following combinations.
Table 3-2
Input / Output
Minimum setting
unit
Smallest mobile
unit
Feed
sha
ft
Mm input, mm output
0.001mm
0.001mm
Inch input, mm output
0.0001inch
0.001mm
Mm input inch output
0.001mm
0.0001inch
Inch input, inch output
0.0001inch
0.0001inch
NOTE
:
The rotary axis unit is not in English / metric to convert.
3.3 Coordinate System
3.3.1 Reference Point
On CNC machine tools, there is a special place, usually the tool change or set the coordinates in this position,
this position is called the reference point. Reference point is a fixed point of the machine by the machine tool
factory setting coordinate system. Reference point return, the tool can easily be moved to that location. Reference
point under normal circumstances CNC milling system coincides with the machine zero.
3.3.2 Machine Coordinate System
A specific point on the machine as a machining datum is called the machine zero (machine zero point for
each machine is set up by the machine manufacturer). Set with machine zero as the origin of the coordinate
system is called the machine coordinate system, it is usually on each axis at the maximum limit. After the power,
perform manual reference position return to set up the machine coordinate system. Machine coordinate system,
once set, will remain unchanged until the power is turned off so far.
3.3.3 Workpiece Coordinate System
Work coordinate system is a coordinate system programmers used in programming process, it is the
program's reference coordinate system, location work coordinate system is the machine coordinate system as a
