Team Members Caitlin Flynn Michael Mahlum Craig Craviotto
Team Members: Caitlin Flynn Michael Mahlum Craig Craviotto Shane Duff Hans Leidenfrost Jake Conn
Table of Contents Linear Actuator Base Arm/Elbow Joint Future Plan
Linear Actuator Previous Issues: • Rack and gear meshing slop • Uniform linear movement through bearings • Drive motor needs replacement Improvement Ideas: • Mount second gear to face of primary gear • Replace linear roller bearings with sleeve bushings • Replace motor with higher torque version
GEARS/ BUSHINGS Fasten new gear to primary gear to increase contact area of gear to linear rack Chose sleeve bushing to increase surface contact on rack to increase stability Will reduce twisting and bending slop Eliminate linear ball bearing for smoother motion
MOTOR Current motor is inopperable 256: 1 Motor ordered to replace the 64: 1 motor previously in place. Higher Torque, but lower speed
Base Setup
Drive Gear POT Current Base Setup ~1/8” slop from lazy susan
Drive Gear New Base Setup
Direct Drive Motor Base Plate Connection Dr ive Mov Bea ing ring pa rt o fm oto r
Arm/Elbow Problems 1/8 in arms Arm twists too much Not rigid enough assembly Elbow helical gears Creates lateral loads on arm Low gear ratio results in small torque increases Exposed gearing picks up debris
Quick Fix Ideas Channel Arm Idea Lighter, strong, resists torsion, but hard to make Square Tube Idea Heavier, strong, and easier to make
New Arm 1 st iteration
Progress so far
Test Assembly: Chipping Rock Goal: Replace the linear actuator with a more powerful assembly to break rock.
Future Milestones 1 st Iteration redesign – Nov. 28 thth Interim Report Fall Semester – Dec. 9 th Final Design Decision – Dec. 2008 Senior Design Expo – May 2008
- Slides: 15