HEIDENHAIN POSITIP 880 User Manual page 65

Major and Minor Arcs - A Major arc has a sweep angle greater than
180 degrees. A Minor arc has a sweep angle less than 180 degrees.
See Fig. I.51 as a graphic example of the two types of angles.
Example: Enter data and mill an arc
From point X1: 6 mm
From point Y1: 3 mm
To point X2: 3 mm
To point Y2: 6 mm
Depth: Thru
Radius: 2.24, < 180°
Direction: CW
Tool offset: Center
1st step: Enter data for an arc
Operating mode: PROGRAMMING
Press the PROGRAMMING FEATURES soft key.
Press ARC soft key.
Beginn data entry
FROM X1
Enter the from point for X. Press ENT.
FROM Y1
Enter the from point for Y. Press ENT.
TO X2
Enter the to point for X. Press ENT.
TO Y2
Enter the to point for Y. Press ENT.
CUT DEPTH
Enter the cut depth. Press ENT.
POSITIP 880
Major
Arc
Fig. I.51
Minor
Arc
65