Ultralightweight High capacity Drum

grabcad

This is a Carbon Fiber Ultra Lightweight Rassor Collection Drum. Two drums are used per side with them positioned at 180 degrees out of phase or in a counter-rotating arrangement. This design suits pickup and discharge in any gravity environment as those actions are independent of gravity. A safety factor for the Design with a 200lb load on the digging teeth is 3.64. Maximum displacement is .15mm, which translates to a very strong and very stiff design that can handle tooth loads in excess of 600lbs. Details: OD: 450mm Overall Width: 359mm Cutting Width: 175 mm Cutting Edges: 2 Cut depth: approximately 20mm Mass: 2 drums, 1.928kg (964g/drum) Capacity: Note includes a 30mm allowance for the central drive shaft. See Images for Min Max Volume configuration Internal Volume (maximum, 2 Drums, 180 degree phased at Top and bottom): 35.6liters (15.4L and 20.2L) Max individual Cartridge Fill Ratio: 99%, 20.94L (scoop at horizontal upside) Expected Maximum Fill Ratio: 96.4%, 20.2L at upright position Minimum Individual Cartridge Fill Ratio: 74%, 15.4L (scoop at bottom) Combined overall Fill ratio: 85% (combined 2 scoops at 180degree offsets (96.4%, 74%) Materials: Side Plates: GFRP Drum Shell: GFRP Scoop Head: GFRP Teeth: Titanium, Riveted Rivets: Aluminum Construction: Sides and Shell: Bonded Scoop and Shell: Bonded Scoop and Teeth: Riveted Design Features: Cartridge design: a) allows for quick swap-out in the event of damage or obstruction b) reduces chance of total loss of function of a unified drum assembly due to damage or obstruction c) simplifies construction while maximizing material properties GFRP Construction: Removes need for internal structures to maximize storage and minimize potential build-up and blockages Offset design: self-regulating depth of cut Single cutting edges: increase available shearing force Radiused cutting edge: reduce digging in, uses a shearing action to remove material rather than breaking it, reducing chance of grabbing Regolith is removed in thin layers (See Attached DPM analysis) Manufacture: Minimum component count (6) Manufacture methods are common and well-known Simple and quick assembly of components Additional Notes: Oversized scoop and tunnel vs cutting depth reduce chance of blockage or jamming approximately 3 times larger than designed depth of cut, which is similar to what the current Rassor System has found most successful.