Designing for Selective Robotic Conformal Coating Processing: Rule 4 “Avoiding component Collisions”
As stated before robot systems are generally not intelligent unless you pay for very sophisticated software based systems with clever sensing systems. When a robot head drives a spray valve around it does not consider the variation in the component placement. It will continue “through” the component if it is in the way and probably destroy the PCB at the same time.
Understand that through-hole components have a very wide range of placement orientations, and if used on a PCB, the drawing must cover all possible orientations of the devices, plus 2.5mm optional coating area. This is to ensure you coat the component leads, wherever they may be positioned.
The Rules for Selective Conformal Coating are straightforward. Follow them and you can save money and time in your application process. However, if the Rules are not followed, the resultant circuit board design can challenge even the most sophisticated conformal coating system and its operator to achieve the finish desired.
Click Designing Circuit Boards for Selective Robotic Conformal Coating for further Rules.