...couple of things Mark:

- Out of curiosity Andy put the figures for your ring through a kinetic energy calculator, and came up with a figure in the region of 350kj. This is not a good thing, with that much energy you are going to destroy just about any clutch you try and put that energy through, and if your weapon hits anything vaguely solid I'd be willing to bet the robot would never work quite the same again, the forces involved would break something - at best your weapon, at worst your entire chassis and drivetrain would be warped out of shape as well.

- I freely admit I don't know much about clutches, but I do know a bit - particularly about dog clutches - and I know enough to be 95% sure that you don't know what you're really talking about, like I said above with the energy you have trying to use any sort of clutch is only going to end in something being broken.

I'm almost certain that you just think this is a cool idea and haven't thought about the practicalities of it at all...sometimes it's best to go with simpler designs, time and time again you have tried to do complex designs and your lack of knowledge has completely ruined a good idea. I'd stay away from complex systems for now and just stick to simple designs that don't require much specialist thinking to understand and implement :P