HEIDENHAIN PT 880 - Manual (Page 81)

POSITIP 880 81
I – 7 Ex
ecuting a Pr
ogr
am
Contour View
The contour view is an optional display screen available when
executing a program. The view will only appear if turned on. Refer to
section I-8 Job Setup for instructions. See Fig. I.58 & Fig. I.59.
Graphic displays
The contouring view provides the necessary feedback for positioning
precisely or for following a contour along the machine plane.
The screen consists of a main view showing the tool path and hole
locations, a smaller window showing the full part, and another smaller
DRO window showing current position.
Main view
The main view is used for finer positioning. It’s scaling is such that one
pixel on the display is equal to the finer of the X and Y axis display
resolutions. This allows scale motion of 1 encoder pulse to be visually
discernible.
A tool icon is fixed in the center of the view. The tool path is displayed
relative to the tool. As the table is moved, the tool path moves relative
to the tool only.
The tool icon is not displayed to scale. It represents the center of the
tool only.
The tool path is offset from the programmed contour by the tool radius
and tolerance band. The tool’s path is relative to the tool selected.
Contours
For lines and arcs the tool path is shown. The tool path includes any
offset specified in the program.
On either side of the tool path is a tolerance band. The tolerance band
parameter is setup in JOB SETUP. The gap between the tool path and
the tolerance band represents the allowable deviation from the tool
path. The inside tolerance band is shown in red. The outside tolerance
band is shown in green.
Please note that this display only allows the operator to
approximately machine along a complex path. The
approximation of the cut to the actual programmed path is
solely a function of the skill and patience of the operator.
Fig. I.58 Test program in contour view
Contour is turned on and off in JOB SETUP.
Fig. I.59 Test program in contour view