HEIDENHAIN ND 522 - Manual (Page 55)

ND 522/523 55
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Milling
Specific
Oper
ations
Arc Milling
The Arc Milling form is used to specify a curved surface to be milled.
Press the ARC milling hard key to open the form.
 Plane Selection : Select the plane by pressing the PLANE soft key.
The current selection is shown on the soft key, and in the plane field.
The graphic in the message box aids in selecting the correct plane.
 Center Point : Enter the coordinates of the arc’s center point.
 Start Point : Enter the coordinates of the start point.
 End Point : Enter the coordinates of the end point
 Step : Enter the step size. When milling, this is the distance along
the circumference of the arc between each pass, or step along the
arc’s contour.
Press Enter or RUN to execute the milling operation. Press C to exit
the form without executing. Settings are retained until power is turned
off.
Execution
 Execute the milling operation by opening the entry form, and
pressing the RUN soft key, or Enter key. The screen switches to the
incremental DRO view.
 Initially, the DRO shows the current incremental distance from the
start point. Move to the start point, and make a plunge cut, or the
first pass across the surface. Press the NEXT PASS soft key to
continue with the next step along the contour.
 After pressing NEXT PASS, the incremental display shows the
distance from the next step along the arc’s contour.
 If no step size was specified, the incremental display always shows
the distance from the closest point on the arc. To follow the contour,
move the two axes in small steps, keeping the (X, Y) positions as
close to 0 as possible.
 When executing a surface milling operation, three views are
available: incremental DRO, contour, and absolute DRO. Press the
VIEW soft key to toggle through the available screens.
The Step size is optional. If the value is zero, the operator
decides at run-time how far to move between each step.