2 Operation
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depends on the programming requirements and the specifications of the machining
diagram.
* W ork Origin
The specifications of the machining diagram are converted to the coordinate system at
the CNC lathe programming stage. Before the conversion, a point on the work-piece is
selected as the zero point of the coordinate system (i.e. work origin) and the coordinates
of other points on the work-piece are calculated based on this work origin.
The programmer determines the position of the work origin. It can be any point on the
centerline of the spindle. However, it is recommended to select an origin that makes
reading of the work-piece coordinate easier. The X-axis of the work origin should be on
the centerline of the lathe spindle. One of the following three points can be selected as
the work origin of the Z-axis: (Fig 2-31)
1. Left end of the work-piece.
2. Right end of the work-piece.
3. Front of the claw or chuck.
Fig. 2-31 Work Origin Selection (1, 2, or 3)
The work origin is also called work zero point or program origin, program zero point.
In this manual, this zero point is always referred to as the work origin. The coordinate
system based on the origin is called work coordinate system. The work coordinate origin
is the work origin. Referring to section 3.12 for the G10 and G50 work origin setting.
The work-piece after being cut with a CNC lathe is symmetrical. Perform machining of
half the side of the work-piece. Therefore, only half of the work-piece should be drawn
on the work-piece diagram when creating a program, as shown in Fig 2-32.
2
1
3
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