Transferring from Chabot to UC Berkeley

Transferring from Chabot to UC Berkeley Robert Moore May 5, 2014

Why Engineering? • Grew up around cars, always fascinated with anything with an engine • Became interested in metal fabrication • Graduated from James Logan in 2002 • Took welding and machining classes in high school and at Chabot, as well as GE • Started at Math 55 at Chabot • Went to work as a machinist for 2 years

Path to Transferring • Decided to go back to school to pursue Engineering • Started back at Chabot full time in Fall 2006 • Worked ~20 hours / week while going to school • Took 3 years to complete coursework at Chabot

Chabot Class Schedule Final GPA: 3.52

Advice for Students • Work to learn all you can in your math classes, math is essential in all future classes • Take advantage of the help offered by professors • Master study skills while at Chabot • Become skilled in Matlab

Differences between Chabot and Cal • Pace at Cal is twice as fast as Chabot • Large Classes • Test are harder and very time sensitive Biggest Surprises: • Not everyone at Cal is a genius • A student that started at Cal doesn’t have an advantage

Mechanical Engineering Curriculum All can be completed at Chabot College

UC Berkeley Schedule GPA at graduation: 3.587

Student Groups at CAL • Super high Mileage Vehicle • CalSol • FSAE

Senior Design Project • Project Goal: • Build CNC plasma cutter table using existing hypertherm plasma cutter. • Fulfill requirements for: • Mechatronics design course (ME102B) • Microprocessor-based design of mechanical systems (ME135)

CNC Plasma Cutter - requirements • Requirements • Cut 4’ x 4’ sheet • Must be semi-portable • Cost not to exceed $2000 • Maximum Cutting speed 385 in/min. • Positioning accuracy to 0.005” • Cutting tip speed must be held constant for best cutting finish

CNC Plasma Cutter – Design • Gantry Design Chosen • Provided minimum footprint for amount of travel. • Linear bearings chosen as guide ways. • Drive System • Rack and Pinion drive for X and Y chosen. • Ball screw drive for Z axis.

CNC plasma cutter – build • All parts machined and fabricated by team. • Steel Frame weldment built at my shop. • CNC work done at ProFAB

CNC plasma cutter - results • Project won best design award for spring 2011.

Ekso Bionics (Formerly Berkeley Bionics) • First job out of CAL, hired October 2011 • Designed improvements for Ekso robotic suit • Worked on grant funded by DARPA for advanced hydraulic pump research

Hyd pump & test stand • Project Overview • DARPA grant funded project to build low-noise high efficiency mobile hydraulic system. • Worked with subcontractor to design hydraulic pump. All actuation designed in house. • Project required a test stand to be designed to evaluate performance of new pumps versus existing technology.

Test Stand - Requirements • Test stand must run two pumps simultaneously • Must record enough data to calculate pump efficiency ( mechanical, volumetric and overall) • Must be easily adapted to various pumps • Hydraulic loading • Constant load for efficiency experiments • Dynamic load to simulate leg actuation on HULC device.

Test stand - design • Measurements Required: • P1a, P2a, P1b, P2b - Pressure • Qa, Qb – Flow rate • ω – Shaft speed • Τact – Input torque • Fluid Temperature • Displacement Position

Test stand - design • Breadboard platforms created to allow maximum versatility. • Static load provided by needle valve flowing through a flow-meter

Test stand - design • Dynamic load designed to replicate inertia of leg from HULC. • Inverted pendulum chosen as inertial load. • Features adjustable inertia as well as a separate damping cylinder to provide external loading.

Test stand – results on existing pump • Existing gear pump results from test stand

ZEE.AERO • Hired November 2013 • Working on Power and Propulsion team From Gizmag.com

Any Questions? • e-mail me any questions: robertwmoore17@gmail.com Information: fsae.berkeley.edu me.berkeley.edu coe.berkeley.edu

Transferring from Chabot to UC Berkeley