Machining Cycle, Approach/Retraction - Siemens SINUMERIK 840D sl Operating Manual

7.4.2

Machining cycle, approach/retraction

Approaching and retracting during the machining cycle always follows the same pattern if
you have not defined a special approach/retraction cycle.
If your machine has a tailstock, you can also take this into consideration when traversing.
The retraction for a cycle ends at the safety clearance. Only the subsequent cycle moves to
the retraction plane. This enables a special approach/retraction cycle to be used.
Note
When selecting the traversing paths, the tool tip is always taken into account; i.e. the tool
expansion is not considered. Therefore, you should ensure that the retraction planes are an
appropriate distance away from the workpiece.
Approach/retraction sequence in a machining cycle
Figure 7-5
● The tool traverses in rapid traverse along the shortest path from the tool change point to
● After this, the tool traverses in rapid traverse to the safety clearance.
● Following this, the workpiece is then machined with the programmed machining feedrate.
● After machining, the tool retracts with rapid traverse to the safety clearance.
● The tool then continues to traverse vertically in rapid traverse to the retraction plane.
● From there, the tool traverses in rapid traverse along the shortest path to the tool change
The spindle (main, tool, or counter-spindle) begins to rotate immediately after the tool
change.
You define the tool change point, the retraction plane, and the safety clearance in the
program header.
Turning
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Machining cycle, approach/retraction
the retraction plane, which runs parallel to the machining plane.
point. If the tool does not need to be changed between two machining processes, the tool
traverses from the retraction plane to the next machining cycle.
Creating a ShopTurn program
7.4 Fundamentals
229