BobCAD-CAM allows you to assign geometry to define lathe tool holders that are used with the collision detection options in the Lathe Wizards.
1 In the graphics area, draw the 2D shape of the holder.
At the position of the attachment point of the tool insert, place a dashed circle.
It does not matter which dashed pattern is chosen, just that the circle itself is not solid.
2 To open the Tool Library, do one of the following:
Right-click 
CAM Defaults, and click
Tool Library.
Right-click 
Turning
Tools, and click Tools.
3 In the Tool Library, select the lathe tool category that you want to modify.
4 In the list on the right side of the dialog box, click the tool that you want to modify, and click Modify.
(If you are creating a new tool, just select the category, and click Add.)
5 In
the Create/Modify dialog box,
click Edit Tool Holder.
6 In
the Tool Holder Definition dialog
box, select the radio button for Custom.
7 Click Pick Geometry.
The Tool Holder Definition dialog box hides to allow you to select geometry from the graphics area.
8 In the graphics area, click and drag a window around the entire drawing to select the holder geometry.
9 Right-click anywhere
in the Workspace, and
in the shortcut menu, click 
OK.
The holder geometry is now assigned to the selected tool.
Click
OK
to save the changes and return to the Tool Library.