Hi team, I'm making a storm trooper with a moving arm and head on 3 axis. I'm afraid it will wobble when the head or arm moves if I don't make the base heavy enough or the skeleton study enough. not sure how to start but I'm guessing PVC won't cut it. does anyone have experience with this? Thanks!
Is this going to be life size? If so I'd use aluminum tubing. You might want to check out Servocity.com as they have a whole system of aluminum structures with pivots, gears, etc. that will allow you to make it move while keeping it light weight and rigid/strong.
For a base you could maybe make something like a shallow wood or MDF box and fill it with sand. A small bag of play sand from HomeDepot weighs like 50 lbs and is only a few dollars.