Only cut a straight line and a knife to the end, that is to say, can only be cut into a straight line from head to tail, it cannot turn to change direction. Because of PCB cutting are very pure commonly so if it is more complex to cut off the path and will switch to Routing machine to plate.
The thickness is too thin and not suitable for V - Cut grooves, generally if the thickness of 1.0 mm below the board is not recommended to do, this is because the strength of grooves can destroy the structure of the original PCB, when design V - Cut boards placed above are heavy parts, because the relationship between gravity and makes it easy to plate bending, this very bad SMT welding operation, easy to cause an empty welding or short circuit).
In through the back to the high temperature of welding furnace. The PCB, the board itself will softening deformation because of the high temperature more than glass transition temperature, if V - Cut position and depth of the groove design well, will make the PCB deformation are more serious, adverse secondary to welding process.