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Re: Enough buying talk. Let's hear about ghettofab!
In the spirit of Dave's comments, I very much believe in the plastic trash can lid also. Our robot this year had an arm with suction. The suction cup: A wal-mart trash can lid with non-porrous foam contact glued to form a seal. To power it: A FP on a shop vac impeller. Other ghettofab parts. Thighmaster roller-pad to supposedly keep from running over the ball. Xerox machine parts used 4, coupler for different motors. To keep the winch from unraveling, a piece of plastic was put around the lead screw. Never came unraveled.
For last year: Edurobot wheels used to form grippers on arm. Held on with plastic automotive push-screws. Caster wheels for turning: We use go kart racing tires on both years robots and can make turning hard. When we had the two extra days we decide to put pneumatically actuated casters on the back to help turning. After plasma cutting a spot while everything is on the robot we fit the caster wheels that saved us from numerous tips into place.
Robovation ghettofab: I took the robovation bot to college with me for an open house booth. I realized the tiny tires weren't going to cut it so I saw that I had both foam board and electrical tape. Using the old hubs, foam board and electrical tape I made new wheels which worked great. More foamboard, duct tape, a three ring binder v piece: I build a protective shell with a scoop, side flaps, and a pusher on back with a duct tape hinge. Three ring binder and IFI parts, Gravis gamepad, velcro and 222 battery: Carryable Controls(all fit in the binder).
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