Bobcat Drillers
Patrick Kirts, Jake Waldrep, Dr. Humboldt Mandell, Tyler Sterling,
and Davontae Habbit
BOBCAT DRILLERS
Davontae Habbit, Patrick Kirts, Tyler Sterling, and
Jake Waldrep
BACKGROUND:
Product: Mars Drill, designing of anchor
mechanism to apply downforce
• Sponsor: Texas Space Grant
Consortium (TSGC), NASA Funding
•
• Contact: Dr. Humbolt Mandell, UTAustin
•
Location
• 3925 West Braker Lane, Suite 200,
Austin Tx, 78759
•
Details: Development of an easily
deployable mechanism to apply
downforce on 2014’s drill design.
•
Specifications
• Capability of applying sufficient
force to drill up 20 meters deep
• Compatibility with existing
technology supplied by NASA
• Design allows for core sample
extraction
• Minimal cost
MISSION STATEMENT
Designing and manufacturing of an easily deployable mechanism that is
capable of applying extensive downwards force on the previously designed
drill bit, removing the need for relocating the drill on the spacecraft or
increasing the overall weight.
Need Statements Related to Importance
Target Specifications and Metrics
Specifications
1.Sufficient Force
2.Uses available power source
3.Withstands drilling force
4.Compatibility
5.Counter drilling force
6.Easily retrieved
7.Simple to use
Metric
1.
2.
3.
4.
5.
6.
7.
Force Target, Force applied on bit : lbs
Electricity, Volts/Watts
Strength, psi
General Design and dimensions, in
Torque, Force, N*m
lbs
N/A
Linking Metrics to Needs
Gantt Chart
Important Dates
● 9/11 - Discussion with
Mandell
● 9/28 - TSGC level I
report
● 10/6 - Concept Selected
● 10/16 - Make Buy
Decisions
● 10/16 - CAD models
● 10/15 - Process
management
● 10/30 - Begin
Fabrication
● 11/16 - Final Report and
Presentation to TSGC
Concept Generation
Concept Variants
Pugh Chart
Concept Selection Matrix
Scissor Jack
Windows
Scissor Jack
• Critical Customer Needs Met:
• Applies down force
• Anchors mechanism
• Resists torque of drill
• Functional in elements
• Uses available power source
• Simple to Use
FMEA (Failure Mode & Effects Analysis)
Bill of Materials (BOM)
Scissor Jack (Components)
Route Sheet
OPC (Operation Process Chart)
PERT Chart
● Design finalization,
processing, OPC, and
materials ordering should be
ran in parallel to ensure parts
arrive in time
● Due to research, concept
generation and selection took
the longest amount to time.
● Assembly has the shortest
duration
Process Name
X
#
Duration (days)
Manufacturing Process
Prototype Testing (FEA)
● Applied 90lb force on
lead screw
● Used Von Mises Stress
to verify part strength
● Stress seen by lead
screw, about 97psi
● Stress seen by links,
about 100psi
SWOT Analysis
Future Considerations and Designs
• The addition of gear teeth to
ensure linkage pairs remain
aligned and stabilized
throughout linear travel.
• Identification of elastic material
to protect from elements
entering the gripper window and
electrical input port.
Acknowledgements
Questions?