VERO UK TRAINING MATERIAL

Version 20

No-Core Cutting

No-Core Cutting

From the menu select file > Open

Open the file:- No core.wkf

In the CAM Navigator, highlight the `Setup' and run the automatic recognition.

Add 2 axis operations to the two tapered features.

The resulting `tapered' machining operations should look like this, with the start points in their default positions

Select the `Wire' tab and double click the operation, select the `Cut method' tab and tick the box `No core (pocket) first cut'. If at this point, you were to hit the Ok button, you would see an error message indicating that you need to add a finishing allowance to the cut.

Select the `Technology' tab and either load your technology from the database

Or enter the value shown here

When you now select the Ok button, the dialog closes, the toolpath graphic disappears and in the CAM Navigator the `cut' changes in colour to red.

DON'T PANIC !

Let's find out what the problem is!

Right hand click on the red text and select `Log window', a web browser window will appear containing a message similar to this…

Wire: 2 axis (Destruction rough) - 1 cut: Wire - D:0.2

Building model data…

Computing tool path…

Logging Started 09/19/11 10:31:47

Op No. 1: No-Core Toolpath Failed - Please Move Start Hole, Reduce its Size or De-select No-Core

Logging Complete

As the message indicates, you have a problem with the start hole size or position.

The reason this toolpath fails when a destruction cut is applied is that the system detects that there is not enough material between the start hole and the outside edge of the apperture. By default the system is setup with a start hole size of 2mm, we can either move the start point and/or reduce it's size, on this occasion we will first reduce the hole size

Double click the cut operation and navigate to the Approach/Retract tab, on the right hand side of the dialog, change the `Start hole diameter' to 0.5 and click Ok

Your destruction cut toolpath should now be visible, the reduced size of the start hole has allowed the cuts to be created but a close look at the upper toolpath will show that the positioning of the start point is not ideal as it resides in the narrowest part of the aperture.

From the Wire tab, right hand click the operation and select `Edit geometry'

From the edit geometry dialog, right hand click on the profile and select `Start/end points

Double click on the box `Approach', and move the start point to a wider part of the aperture.

When you have done, press the `esc' key to return you to the `'Edit geometry' dialog then press the Ok button.

Run a path lab simulation or a kinematic simulation to see that the destruction cut is applied with no taper, then, as the wire nears the edges of the aperture, the taper is gradually applied followed by any trim cuts that have been selected.

VERO UK

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