HEIDENHAIN TNC 122 User Manual - Manual (Page 27)

4 Positioning with MDI
TNC 122 27
Hole patterns
The hole pattern functions BOLT HOLE CIRCLE and LINEAR
PATTERN are provided in the POSITIONING WITH MDI mode of
operation.
You select the BOLT HOLE CIRCLE or LINEAR HOLE PATTERN
function and enter the necessary data. This data, such as the
number of holes and the coordinates of the first hole, is normally
shown on the production drawing.
The TNC calculates the positions of the holes.
Pre-positioning the drill
You pre-position the drill in the Z axis above the surface of the
workpiece. The TNC positions the drill in the X and Y axes (in the
working plane) above each hole position.
Hole depth
If you wish to use a spindle sleeve to drill the holes manually:
⇒
⇒ ⇒ ⇒ ⇒ Answer the dialog prompt DEPTH = with NO ENT.
Input for a bolt hole circle
• Full circle or circle segment
• Number of holes
• Center point coordinates and radius of the circle
• Starting angle (angular position of first hole)
• For circle segment: angle step between the holes
• Hole depth
Input for linear hole patterns
• Coordinates of the first hole
• Number of holes per row
• Spacing between holes on a row
• Angle between the first row and the angle reference axis
• Number of rows
• Spacing between rows
• Hole depth
Drilling the hole pattern
After you have entered all the data:
⇒
⇒ ⇒ ⇒ ⇒ Press the NC start key repeatedly.
The TNC moves the axes one at a time in the working plane and
the tool axis. After drilling it returns the tool to the starting height.
Skipping holes
If you wish to skip certain holes, or bore in a different sequence
than that calculated by the TNC:
⇒
⇒ ⇒ ⇒ ⇒ Select the desired hole with the upward and downward arrow
keys.