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

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Programming technological functions (cycles)

8.3 Contour milling

Labels in the

Path milling (CYCLE72)

You can mill along any programmed contour with the "Path milling" cycle. The function

operates with cutter radius compensation. Machining can be performed in either direction,

i.e. in the direction of the programmed contour or in the opposite direction.

It is not imperative that the contour is closed. You can perform any of the following

● Inside or outside machining (on left or right of the contour).

● Machining along center-point path.

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)

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.

Operating Manual, 03/2013, 6FC5398-7CP40-3BA1

Sinumerik 828d