HEIDENHAIN CNC Pilot 4290 - Manual (Page 21)

9 HEIDENHAIN CNC PILOT 4290
Machine reference points
Machine zero point
The point of intersection of the X-axis with the Z-axis is called the
machine zero point. On a lathe, the machine zero point is usually the
point of intersection of the spindle axis and the spindle surface. The
machine zero point is designated with the letter M.
Workpiece zero point
For machining a workpiece, it is easier to reference all input data to a
zero point located on the workpiece. By programming the zero point
used in the workpiece drawing, you can take the dimensions directly
from the drawing, without further calculation. This point is the
”workpiece zero point.” The workpiece zero point is designated with
the letter W.
Reference marks
Whether the control ”forgets” the positions of the machine axes
when it is switched off depends on the position encoders used. If the
positions are lost, you must pass over the fixed reference points after
switching on the CNC PILOT. The system knows the distances of the
reference points to the machine datum.
1
.4 F
undamentals