Slide 1

Redesign of Hand AugerCaroline TullohBE 3320

Hand Auger

http://b2bimg.bridgat.com/files/handle_earth_auger.jpg

Hand Auger Types

http://soils.usda.gov/technical/manual/images/fig4-10_large.jpg

Design of Hand AugerThree Main ComponentsThreads Outside ShaftApproximately Six Meters in Length Typically Manufactured with Steel

http://collections.infocollections.org/ukedu/collect/ukedu/index/assoc/h2380e/p018.gif

Components Chosen for RedesignMaterial from Cast or Alloy Steel to Carbon SteelAuger Threads increase width of threads and decrease pitch

Inventor Drawing Hand Auger

Inventor Drawing Auger Threads

Inventor Rendering

Design EquationsF=ma=(80kg)(9.82m/s^2)=784.8 N=rFsin()=((3m)(785N)(1))=2355 Nm (handle)=rFsin()=((6m)(785N)(1))=4710 Nm (threads)

Stress Analysis

Dynamic Simulation