Just a Robotics Question (need ideas from the smarts)

[Weird Al/ Tony]

Hi. I'm usually on here to ask questions. so thats what i'm doing today. oh and the flint car show was fun with the teams that went. anyways. I am usually asking questions for my own personal robot which is a battle bot in the making. I am on a team but since it's the off season we're just fixing and editing for the off season kickoff in september. anyways the question i have is in relation to my robots pincers. I am designing them to close in a side ways motion(one on each side). I am planning to power them using pneumatics, to push out on the back of the pincers behind the main joint in order to close the front. the pincers will be a foot and a half long infront of the rotation point, and half a foot behind it. the back will also come in slightly for spaceual reasons. I believe it to be a working design. it is based off of Dead Metal from robot wars (british) if you have any ideas on an efficient/cheap/working pincer idea or design it would be greatly appretiated.