Using Fusion 360 to look at meshing or contact. When we tell a CAD program that physics needs to be at play, we start to put a lot of strain on the computer. In this example, I create 2 gears and have them mesh, when I try to rotate one gear, the other should of course move as it is touched by the driving gear. The computer has to generate a huge amount of information for this to be processed, although Fusion is very powerful, it does find it challenging to calculate the information needed.