Regolith Drum Cartridge Light Weight V2

Last crawled date: 1 year, 10 months ago

This version is a design comparison to show what is possible.

The Stamped version is made from stamped magnesium side plates. 200lb load on Shearing face of Teeth yields a 1.7 Safety Factor. Mass is dropped below 3kg for the Drums. This design could also be adapted for Additive manufacturing.

This design is for a cartridge based 3 component drum system.

Details:
OD: 450mm
Overall Width: 359mm
Cutting Width: 119.5mm
Cutting Edges: 3
Cut depth: aprox. 11mm
Mass:
Stamped Magnesium 2.847kg(.949kg/Cartridge)

Capacity: (note includes 30mm allowance for central drive shaft) See Images for estimated volumes
Internal Volume(theoretical maximum, 3 Cartridges): 42 liters(14L/cartridge)
Max individual Cartridge Fill Ratio: 99% (scoop at horizontal upside)
Minimum Individual Cartridge Fill Ratio: 76% (scoop at bottom)
Combined overall Fill ratio: 90% (combined 3 scoops at 120degree offsets(99%, 94%, 76%)
Estimated actual Fill Ratio: 80-85%(5-10% less than Theoretical)

Materials:
Side Plates: Machined T6 Magnesium
Drum Shell: T6 Magnesium
Scoop Head: T6 Magnesium
Teeth: Carbide, Cast Ceramic or Hardened Steel, Machined or Cast, Riveted to Shell(Al Rivets)

Construction:
Sides and Shell: Welded
Scoop and Shell: Welded
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

Welded 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 an breaking digging action reducing chance of grabbing.

Manufacture:
Minimum component count(6)
Manufacture methods are common and well known
Simple and quick assembly of components

Additional Notes;
Oversize scoop and tunnel vs cutting depth reduce chance of Blockage or jamming approximately 3 times larger than designed depth of cut.