Tree SharkDoes anyone have anunwanted tree?

Presented By:

Guadalupe A. Fernandez

Christen Longoria

Joel Solis

Miguel Perez

Problem Statement

Is it possible to design an independentHydraulic Cutting Machine that willshear a mesquite tree with a basediameter of 8’’?

Design Criteria

• Cut 8” diameter tree• Cuts low to the ground• Man-Mobile• Easy to use• Marketable• Affordable

Design Evolution

Tree Shark Design 1 (TS1)

Tree Shark Design 2 (TS2)

Design Evolution continued

Tree Shark Design 3 (TS3)

With serrated blades forfriction

Guillotine Test Machine

Cutting Mechanism Layout•Theta2

•Theta2i

• Theta3

•Theta3i

• e = ecc.>2

•Lab ( r )

•Lbc ( l )

•ACmx

Blade and Link Calculations

• Length of members AB and BC

• Maximum force in member BC

• Maximum moment about point A

e

ACLL mx

bc

ab

ii

ii

)sin()sin()cos()cos(

32

32

)cos(2 3F

Fbc

)sin()cos( 22 abbcyabbcxa LFLFM

Blade and Link Calculations

• Force in Blade at tree core

• Total Stroke

3159.8a

bladeM

F

)cos()cos( 32 bcabmx LLACStroke

Force in Blade Versus Blade Angle

Final Options

Case 1 Case 2 Finale (in) 0 0 0.5

Theta2 (deg) 21 27 16Theta3 (deg) 19 22 14

LAB (in) 7.0909 6.949 7.7441LBC (in) 7.8053 8.4216 6.7566

Stroke (in) 4.0099 4.1359 4.1551Fblade max (lb) 20,169 20,241 21,421Fblade min (lb) 15,547 17,542 13,553

AC = 14" F = 60,000 lb

Blade Optimization Matrix

Blade Design Slipping Effectiveness Cuts Low Marketable Aesthetics Design Integration TOTALFlat Plate 2 2 3 2 2 1 12Serrated Blade 2 2 3 3 3 3 16Locked Arms 3 3 3 2 2 1 14Hooked Blade 3 3 3 2 2 1 14

1 = Poor

2 = Satisfactory

3 = Excellent

Final Blade Design

•½” Blade

•900 Bend

- 4” Drop

- 1” Plate

• Ribs

• Serrated

• Linkage Spacer

Frame Assembly

NE/Nastran Analysis

Cutting Assembly

Hydraulic Circuit

Cost Analysis

Hydraulic CircuitPump $107

Engine $200

Cylinder $100

Control Valve $67

Hoses ½” (3) $20

Hoses ¾” (4) $35

Filter $13

Pressure Gauge $20

4.8 Gallon Tank $60

Hydraulic Fluid $30

Shipping $51

Taxes $58

TOTAL $761

Cost Analysis ContinuedMetal1” Thick Steel Plate (1x2’) $107.92

1 ½” O.D. Round Tube (4’) $13.00

½” Thick Steel Plate (2’x2’) $137.40

2½” x 2½” x 11 GA -Square Tubing (8’) $61.28

Shipping $46.11

TOTAL $365.71

LaborConsultant, 5 hours @ $125/hr $625

Welder, 15 hours @ $30/hr $450

Machinist, 6 hours @ $30/hr $180

4 Students, 40 hours @ $10/hr $1600

TOTAL $2855

TOTAL $3981.71

Conclusions

Completed Objectives:– Capable of cutting 8” diameter– Cuts ½” off the ground– Easy to use

• Mobile– Requires 85 lb of force to tilt– Weighs approx. 300 lbs

• Handles and foot pedal• Start-up motor and control valve

– Marketability• Affordable if mass produced

Suggestions for Future Work

• Manufacturing Tree Shark– Finding Sponsors for funding– Utilize salvage yards

• Shortening the frame– Inverting the piston

• Hooked Blades– Prevent slipping

• Bearings and Lubrication– Prevent friction

• Motorized vehicle

References1. A. Ertas and J. C. Jones, The Engineering Design Process, Second Edition,

John Wiley & Sons Publishing, 1996.

2. M. F. Spotts, Design of Machine Elements, Eighth Edition, Prentice Hall,2004.

3. R.C. Hibbeler, Mechanics of Materials, Fifth Edition, Prentice Hall, 2004.

4. G. L. Kinzel and K. J. Waldron, Kinematics, Dynamics, and Design ofMachinery, John Wiley, 1998.

5. Parker Hannifin Corporation, 2004. <http://www.parker.com/>.

6. Basic Hydraulics Theory. Northern Hydraulics Inc<http://www.northernhydraulics.net/>.

7. Hydraulic Parts. Northern Tools + Equipment, 2005.<http://www.northerntool.com/>.

8. 47th Edition Blue Book Tractor Supply Book

Special Thanks

• Town and Country Wrecker Service– Guadalupe & Carlos Fernandez

• Lonesome Pine Ranch– Javier Perez

• Senior Design Advisor– Dr. Larry Peel

• Driscoll Volunteer Fire Department– Mike Zamora