HEIDENHAIN NC 124 - Manual (Page 48)

4 Positioning with MDI
48 TNC 124
Hole patterns
The hole pattern functions Circle Pattern and Linear
Pattern
are available in the POSITIONING WITH MDI mode of
operation.
Use the soft keys to select the desired hole pattern function and en-
ter the required data. These data can usually be taken from the
workpiece drawing (number of holes, coordinates of the first hole,
etc.).
The TNC then calculates the positions of all holes in the pattern, and
displays the pattern graphically on the screen.
Type of hole
At the hole positions that were calculated for the pattern you
can execute either
• pecking or
• tapping operations.
Enter the required data for pecking or tapping (see pages 43 to 47).
If you do not wish to drill at the calculated hole positions, or if you
want to drill the holes manually:
➤ Choose the soft key No Entry for Type of hole ? .
Pre-positioning the drill
Pre-position the drill in the Z axis to a position above the workpiece
surface. The TNC then pre-positions the drill in the X and Y axes
(working plane) above each hole position.
Bolt hole circle patterns
If you are drilling a Circle Pattern in the POSITIONING
WITH MDI
mode of operation, enter the following data:
• Full circle or circle segment
• Number of holes
• Center point coordinates and radius of the circle
• Starting angle (position of first hole)
• Circle segment only: angle step between the holes
• Bore hole or tap hole
Linear hole patterns
If you are drilling a Linear Pattern in the POSITIONING
WITH MDI
mode of operation, enter the following data:
• Coordinates of the first hole
• Number of holes per row
• Spacing between holes on a row
• Angle between the first row and the X axis
• Number of rows
• Spacing between rows
• Bore hole or tap hole
Fig. 4.3: On-screen operating instructions:
graphic for bolt hole circle pattern
(full circle)
Fig. 4.4: On-screen operating instructions:
graphic for bolt hole circle pattern
(circle segment)