Team: John Robey, Zachary Werber, David Prier, Cody Hannan, Enis Inan Moveable Hatch Team: John Robey, Zachary Werber, David Prier, Cody Hannan, Enis Inan Sponsor: Zdenek Zumr
Project Background Separate a two story home Keep functionality of stairs Blend in with existing home Allow privacy for both floors Increased revenue
Product Design Specifications
Mapping the House
Hatch Design
Hinge Design Provide flush to flush movement Allow for locking in closed position Support the weight of the hatch
Hinge Fabrication Construction Laser cut 3/16” steel plate. All parts welded to hinge back plate. Steel bar cut down, milled, drilled, and tapped to form hinge arms & clevis. Shoulder bolts for pins. Challenges Laser cutter Alignment (multiple axes of rotation) Welding
Test Stand Frame Standard 2x4 kiln dried stud construction. Studs are 16” on center. 3” construction screws.
Test Stand Actuation 12V DC power supply fed into a dual-pole, dual-throw rocker switch that will supply power to both actuators Previously used a 9” and a 24” actuator, found speed and throw length made deployment unstable. Switched to two 9” actuators yesterday. Both 9” actuators will hit their internal limit switches to turn off, an optional limit switch can be attached.
Test Stand Hatch Construction 1” square 16 gauge steel tubing. ¾ “ oak faced plywood. ⅜” hardwood flooring. Wood products attached with sheet metal screws and finishing nails. Hinge and actuator attachment points welded to steel tube frame.
Test Stand Fabrication
Test Stand Findings Hinge requires very precise alignment or it will bind up during motion. Hinge required an additional curved arm to reach its current complete design. Identical 9” actuators are not identical. Hatch flexes when jumped on. Actuators and hinge bear a large portion of weight when in the horizontal position. Deadbolt bracket requires tighter tolerances for more rigidity when engaged.
Special Mention Sulzer Pumps for donating, cutting, and welding the steel tube frame. Emerson Hardwood for donating flooring.