Allowing any tool to have a negative X-Offset allows the shear to allways have a zero offset. Although this is not a requirement it is an easier concept for users to understand. In addition it allows any tool X-Offset, including the shear to be adjusted with respect to all other tools.

It is important to know that the controllers part calculation and queueing code must not access the tool offset directly from a tool record. The tool offset must be accessed via GetTool or FindMaxOffset. These methods return the X-Offset relative to the shear tool so that the 'effective' shear X-Offset is allways zero. This ensures that scrap handling during queue initialization allways works correctly.