Today we are dealing with a frequently asked question from the turning sector. How can we pass a toolpath on a turning part, without any rest material left on it? Or in other words: how can we turn if we have no rest material? By creating a normal operation we only get an error message. We will show you the solution in our NX CAM QuickTip.
Turning without Rest Material in NX CAM
NX CAM QuickTip | Using the Teach Mode to create an empty turning path
Heinrich Flaum | 
In today's example, we have manufactured a turned part that we are not only turning, but also milling. After milling, a burr has appeared on the lateral surface of our workpiece. As we now want to remove that burr, we will have to add a second turning operation - even though there's no rest material existing.
If we take a normal operation for this - adjust tool orientation and trim areas here - and then create the operation, we get an error message.
This is because the turned part has already been finished in the previous turning operations. Now how can we still turn our burr?
You can see the solution in this video.
Step by Step
With a right click we click on our Avoidance. Then click on Insert - Operation. As type we select "Turning", as operation subtype we select "Teach Mode".
The Teach Mode allows manually defined movements that the user can control.
In the dialog window that then opens, we first make some basic settings, e.g. we define the tool orientation. In the "Main" tab, we now have the option in the sub-operations to define exactly how the tool should move.
We add a new sub-operation. In the "Create Teachmode Suboperation" menu, we now define how the approach and retract should look. Then we turn our attention to the profile shift, where we can define a new traverse curve. Here we can now select the lines of our workpiece that are to be traversed.
Define free movement
If we confirm everything with Okay after our settings, the toolpaths will be displayed to us. However, when we move back, we have a collision. How can we avoid that our tool moves completely over our part again when retracting?
Under Free Movements in the Retract tab, we simply change the movement type from Axial → Radial to Radial → Axial. After generating the operation, we see that our tool moves off the turned part empty and then returns to its retraction point without collision.
Successful and collision-free result
Now we have finished processing all of our operations and have created an operation to "turn without residual stock". In the machine simulation we can see the successful and collision-free result.
Heinrich FlaumCAx Senior Pre-Sales Consultant
E-Mail: Heinrich.Flaum@janus-engineering.com
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