This page contains a Flash digital edition of a book.
Mathematics is Focus of Two Grants CAMPUS CURRENT


Dong-hyeon Park ’14 spent two weeks this past summer work- ing with Aid Africa to field test an HMC-designed manual water drill bit in Northern Uganda. The test site’s location in the remote village of Rwothobilo

gave Park a glimpse of the need the drill will meet and the peo- ple it will serve. “They had springs, but it was mostly dirty and contaminated water,” Park said. “Some had pumps that were installed by others, but many of those did not work properly or provide enough water.”

“It was fun trying to fix the problems as they came up and setting the drill up and seeing it work.”

The work gauged the performance of the prototype Park and his fellow E4 Water Drill Team members developed during the 2010–11 academic year. Aid Africa asked the team to rede- sign its current drill bit to better withstand the sandy and rocky Ugandan soil. The original, X-shaped drill bit often got stuck in the soil and the drill pipe broke whenever the bit struck rock. The team was also tasked with making the drill less strenuous for its users to operate. Park and team members Brett Manning ’14, Nobuhiro Yokote

and Courtney Keeler ’14 developed a conical-shaped drill tip with slots that allow the sandy soil to enter the pipe. Under the supervision of engineering Professor Adrian Hightower, they also designed a tripod, rope and pulley system that eased the stress on the drillers. To operate the drill, three people pull on the rope to lift the drill-pipe while two others hold the pipe and provide stability and downward thrust. Each time the rope is let go, the drill-pipe is manually thrust down into the soil. Once the pipe fills with soil, it is pulled up and emptied. The drillers repeat the process until they strike water. The drill bit tested well in California, but had to be modified to fit the larger pipe used in Uganda. So the test team added couplings to increase its diameter.

Student Research

Engineer Dong-hyeon Park ’14, shown working with Ugandan villagers, and two other Mudders worked with Aid Africa to redesign a drill bit.

“It was fun trying to fix the problems as they came up and setting the drill up and seeing it work,” Park said. “The coni- cal [bit] worked pretty well because it could go through rocks and hard soil. I thought we would have to hit a couple hundred times to go in a foot, but it only took about 30 strokes down to get a foot deep.”

—Koren Wetmore

FALL/WINTER 2011 Har vey Mudd College


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52