NASA RASSOR "Chum Bucket"

grabcad

My design’s main feature is a corkscrew on the inside of the drum. The scoops are on each end and as dirt is collected it is forced away from the openings and towards the middle by a corkscrew on the inside. When it is time to unload the drum spins the other way and the dirt is forced back towards the openings and will then fall out. The plates on the outside are to bolt the drum to the RASSOR. This design can be welded into one piece of metal which makes it very rugged and maintenance free.Design Requirements Met• Maximum total width of scoops engaged at any given time: 80mm• Bucket drum mass: 5kg made of magnesium alloy with density .063 lb/in^3• Bucket drum Diameter: 350mm• Bucket drum Length: 250mm• Volume of regolith captured: Max of 23L. Did not run simulation to determine true fill ratio but would expect over 80% giving a volume of regolith captured of 18.5LJudging Criteria Met1. No simulation was run to determine true fill ratio, but I expect a 80% fill ratio2. My design works by an interior corkscrew or auger that moves the regolith from the outside where the scoops are to the inside where it can be stored and transferred without regolith falling out. The intended fill ratio is 80%.3. This design can be produced using relatively low cost and low-tech methods. The drum can be produced with either CNC milling or casted. The auger can be CNC milled, cast, or forged. The scoops can be CNC milled. These parts can then be welded together to create one solid part.4. The design meets all dimension requirements.