Bobcat DrillersPatrick Kirts, Jake Waldrep, Dr. Humboldt Mandell, Tyler Sterling,

and Davontae Habbit

Davontae Habbit, Patrick Kirts, Tyler Sterling, and Jake Waldrep

BOBCAT DRILLERS

• Product: Mars Drill, designing of anchor mechanism to apply downforce

• Sponsor: Texas Space Grant Consortium (TSGC), NASA Funding

• Contact: Dr. Humbolt Mandell, UT- Austin

• 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

BACKGROUND:

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

1. Force Target, Force applied on bit : lbs2. Electricity, Volts/Watts 3. Strength, psi4. General Design and dimensions, in 5. Torque, Force, N*m6. lbs7. N/A

1.Sufficient Force2.Uses available power source 3.Withstands drilling force4.Compatibility 5.Counter drilling force 6.Easily retrieved 7.Simple to use

Target Specifications and Metrics

Specifications Metric

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

X #

Process Name

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

• Mentor: Humboldt C. Mandell, Jr., Ph.D. - The University of Texas Center for Space Research (CSR)

• Instructor/Supervisor: Namwon Kim, Ph.D., Ingram School of Engineering, Texas State University

• Lab Supervisors & Technicians: Ray Cook, Ph.D., Ingram School of Engineering, Texas State University

Questions?