- In section 2.1.1 there is a note that states "CAM applications are designed to fail safely; that …

… - In section 2.1.1 there is a note that states "CAM applications are designed to fail safely; that is, if any of the features of the model cannot be reached without plowing through another essential section of the geometry, the problematic region simply won't be machined at all." This is really, really bad advice for someone learning CNC, because it's the kind of statement that may be true 90% of the time but the remaining 10% where it is false can have serious consequences (ruined workpieces, broken tools, crashed machines, injuries etc). Every one of the 6 CAM programs I have used has both intended behaviors and bugs/edge cases that will violate this assumption. A CNC learner should instead be instructed to have a step-by-step verification checklist to determine the correctness and safety of a new program. This includes steps utilizing both the simulation functions within their CAM program and dry running on the machine. …