Hello every body I want to build a virtual turret for a lathe machine. When modeling only one station and one tool for my virtual lathe, every thing is ok, and the simulation is performed correctly. But when i want to add more adaptors and more tools to the turret, the simulation does not perform correctly. when i define a c-axis for my turret, it gives "can not normalize null vector" error, and when i dont define c-axis for my turret, no tool change takes place. I will be very thankful if