HEIDENHAIN MANUALPLUS 620 User Manual page 344

Parameters—finishing
Q Machining direction (default: 0)
0: From the inside out (from the inside towards the outside)
1: From the outside in (from the outside towards the inside)
O Plunging behavior (default: 0)
O=0 (vertical plunge): The cycle moves the tool to the
starting point; the tool plunges and finishes the pocket.
Q=1 (approaching arc with depth feed): When machining
the upper milling planes, the tool advances to the milling
plane and then approaches on an arc. When machining the
bottom milling plane, the tool plunges to the milling depth
while moving on the approaching arc (three-dimensional
approaching arc). You can use this approach behavior only
in conjunction with an approaching arc "R" and when
machining from the outside toward the inside (Q=1).
Cycle run
1 Starting position (X, Z, C) is the position before the cycle begins.
2 Calculates the number of cutting passes (infeeds to the milling
planes, infeeds in the milling depths).
3 Moves to the safety clearance and feeds to the first milling
depth.
4 Mills a plane.
5 Retracts by the safety clearance, returns and cuts to the next
milling depth.
6 Repeat steps 4 and 5 until the complete surface is milled.
7 Returns to retraction plane RB.
You can change the cutting direction with the cutting direction H,
the machining direction Q and the direction of tool rotation (see
following table).
Pocket milling, finishing G846
Direction of tool
Cutting direction
rotation
Up-cut milling Mx03
(H=0)
Up-cut milling Mx04
(H=0)
344
Execution Cutting direction
Climb milling (H=1) Mx03
Climb milling (H=1) Mx04
Direction of tool
Execution
rotation
ISO Programming