week 9 deliverables team highlander 3/10/10. continued analysis added moment to handle, no...
TRANSCRIPT
Week 9 Deliverables
Team Highlander3/10/10
Continued Analysis
• Added moment to handle, no significant change in tipping problem
• With a 25 lb weight, wrist generates roughly 4.2 ft-lb of torque
• Original moment was -86.3 ft-lb for the entire frame, so doesn’t effect tipping
Manufacturing Materials
• Handle Bars• Stopper (counter moment)• Linkage arms• Lever• Made with 6061-T6 Aluminum– Same material used on good bicycle frames– Low cost ($4.68/2 ft 3/4 SCH 40 (1.05 OD X .113W)) – High yield stress (400 MPa)
Manufacturing Materials
• Pins and Bolts– Steel, found readily at a variety of locations– Standard sizes used – nothing custom-made
• Handle and lever grips– Silicon, good cushion level and relatively cheap,
easy to mold
Manufacturing - Prototype
• Bars will be shipped as pipes, and will be machined by Team Highlander
• Bolts/Pins purchased at Home Depot• Handle and lever grips– Use bicycle handlebar tape– Good cushion level, high quality, does not require
any sort of injection molding– Costs approximately $20
• Handle bar pivot will be clamped onto the frame
CastingSmall Volume Large Volume
Manufacturing – Final Product1-1,000 Units
• Type of manufacturing used– Handle bars: extrusion (hot)– Handle grips: injection molding– Curved stopper legs: sand casting (or plaster)– Pins/Bolts: sand casting– Lever bars: extrusion (hot)– Lever handles: injection molding– Linkage rods: extrusion (hot)– Lever/handle brackets: sand casting/welding
Manufacturing – Final Product1,000-1,000,000 Units
• Type of manufacturing used– Handle bars: extrusion (hot)– Handles: injection molding– Curved stopper legs: permanent mold casting– Pins/Bolts: permanent mold casting– Lever bars: extrusion (hot)– Lever handles: injection molding– Linkage rods: extrusion (hot)– Lever/handle brackets: permanent mold
casting/machining/welding