HEIDENHAIN TNC 122 User Manual - Manual (Page 23)

4 Positioning with MDI
TNC 122 23
Positioning with Manual Data Input (MDI)
For many simple machining tasks, for example if a part is to be ma-
chined only once, or if you are machining simple geometrical
shapes, it would be too time consuming to enter the individual ma-
chining steps in an NC program.
In the POSITIONING WITH MDI mode of operation you can ex-
ecute the working steps as you enter them instead of storing them
in a part program.
Simple milling and drilling operations
Enter the following nominal position data manually in the POSI-
TIONING WITH MDI mode of operation:
•
Coordinate axis
• Position value
• Radius compensation
The TNC then moves the tool to the desired position.
Hole patterns
he POSITIONING WITH MDI mode of operation also supports the
TNC "Cycles" (see Chapter 5):
•
Bolt hole circle patterns
• Linear hole patterns
Before you machine the part
⇒ ⇒ ⇒ ⇒ ⇒ Insert the tool.
⇒ ⇒ ⇒ ⇒ ⇒ Pre-position the tool so that the tool and workpiece will not be
damaged during workpiece approach.
⇒ ⇒ ⇒ ⇒ ⇒ Select an appropriate feed rate F.
⇒ ⇒ ⇒ ⇒ ⇒ Select an appropriate spindle speed S.
⇒ ⇒ ⇒ ⇒ ⇒ Switch on the spindle, e.g. with the miscellaneous function
M3.
Taking the tool radius into account
The TNC can compensate the tool radius (see Fig. 4.1). This allows
you to enter workpiece dimensions directly from the drawing. The
TNC automatically lengthens (R+) or shortens (R–) traverse by the
tool radius.
Entering tool data
⇒ ⇒ ⇒ ⇒ ⇒ Press the TOOL DEF key
⇒ ⇒ ⇒ ⇒ ⇒ Enter in sequence the tool radius, length, and axis.
4
R–
R+
Y
X
R0
Fig. 4.1: Tool radius compensation