Path Milling (Cycle72) - Siemens sinumerik 840D sl Operating Manual

Parameter
Contour selection
Contour name
Labels
Subprogram
Labels in the
subprogram
8.5.7

Path milling (CYCLE72)

Function
You can machine open or closed contours with the "Path milling" cycle. Before you can mill
the contour, you must enter the contour. Machining can be performed in either direction, i.e.
in the direction of the programmed contour or in the opposite direction.
For machining in the opposite direction, contours must not consist of more than 170 contour
elements (incl. chamfers/radii). Special aspects (except for feed values) of free G code input
are ignored during path milling in the opposite direction to the contour.
Programming of arbitrary contours
The machining of arbitrary open or closed contours is generally programmed as follows:
1. Enter contour
2. Contour call (CYCLE62)
3. Path milling (roughing)
4. Path milling (finishing)
5. Path milling (chamfering)
Turning
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Description
Contour name

Labels

Subprogram

Labels in the subprogram

CON: Contour name
LAB1: Label 1

LAB2: Label 2

PRG: Subprogram
PRG: Subprogram

LAB1: Label 1

LAB2: Label 2

You build up the contour gradually from a series of different contour elements.
You select the contour to be machined.
The contour is machined taking into account various approach and retract strategies.
If you programmed a finishing allowance for roughing, the contour is machined again.
If you have planned edge breaking, chamfer the workpiece with a special tool.
Programming technology functions (cycles)
8.5 Contour milling
Unit
391