Plunge Milling by Offset

See also Plunge Milling with Points.

To create the operation you define::

• the geometry of the part to machine ,
  • The operation takes into account the geometrical environment and
    thus accepts the definition of the part and the definition of the rough stock.
  • If the rough stock is not defined, the operation uses the rework technology
    in order to take into account the shape of the stock at the beginning of the operation

• the tool to use :
  • Center cutting plungers,
  • Side plunging milling cutters.
• the parameters of the machining strategy ,
• the feedrates and spindle speeds ,
• the macros .

Only the geometry (part, points and contours) is obligatory, all of the other requirements have a default value.

For more information on the parameters, please refer to Plunge Milling Parameters.

• make the Manufacturing Program current in the specification tree if you want to define an operation
  and the part/area to machine at the same time,
• or select a machining feature from the list if you have already defined the area to machine and
  now you want to define the operation to apply to it.

Below we are going to see how to do the first of these and how to define an user grid.

Open file Plunge2.CATPart from the samples directory.

1. Click Plunge Milling in the Roughing Operations sub-toolbar.
   A entity and a default tool are added to the program.
   The dialog box opens at the geometry tab page .
   This page includes a sensitive icon to help you specify the geometry to be machined.
   
   The area that represents the part geometry is colored red indicating that the geometry is required for defining the area to machine.

2. Click the red area representing the part in the sensitive icon and select the part in the viewer.
   Then double-click anywhere in the viewer to confirm your selection and redisplay the dialog box.
   

3. Click the red area representing the rough stock in the sensitive icon and select the rough-stock as shown below.
   

4. Go to the Machining Strategy tab..
   Select By Offset as the Grid type.
   The dialog box changes to this:
   
   

5. Click the red curve in the sensitive icon and select a contour in the 3D Viewer.
   

6. Go to the tool tab and change the tool diameter to 20:
   

7. Click Tool Path Replay .
   A progress indicator is displayed. You can cancel the tool path computation at any moment before 100% completion.
   The tool path is displayed.
   
   Click OK in the Plunge milling.1 dialog box, and OK in the main dialog box to validate and exit the dialog box.

8. Create a new plunging by offset operation, with the following contour:
   

9. Click Tool Path Replay .
   The tool path is displayed.
   

10. Go to the Grid tab and increase Contour Number to 6.
    
    Click Tool Path Replay .
    The tool path is displayed.

11. If you play the Video from last save result, you see:
    
    Go to the Grid tab and decrease the Finished cutting progress value to 1mm. Click Tool Path Replay and then play the Video from last save result again.
    This results in:
    

12. Click OK in the Plunge milling.1 dialog box, and OK in the main dialog box to validate and exit the dialog box.

Invalid Face

1. If a tool path cannot be computed because of invalid faces,
   an explicit warning message like this one will appear:
   
   Each invalid face is highlighted in red, with an arrow pointing on it.
   
   This visualization is removed when you close the main dialog box or
   when you select Remove in the contextual menu.
   

2. Click OK in the Warning box to revert to the main dialog box.
   In the Geometry tab, a message Ignore invalid faces: No is displayed:

3. You can either:

   close the dialog box. When you reopen it, the Ignore invalid faces: No will not be displayed. heal the defective geometry and restart the computation. If it is successful the message Ignore invalid faces: No will disappear. ignore the invalid faces. Click the text Ignore invalid faces: No. It will turn to Ignore invalid faces: Yes and the computation will continue. The message remains displayed as a warning.