The Danish Deep Drill Progress Report: February-March 1979.

The 'Danish Deep Drill' was developed at the University of Copenhagen. The drill, which will be used to obtain ice cores from the Greenland Ice Sheet, was tested at the U.S. Army Cold Regions Research and Engineering Laboratory. The drill is battery-operated and has a down-hole microproces...

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Bibliographic Details
Main Author: Rand,John
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1980
Subjects:
Snow
Ice and Permafrost
Machinery and Tools
*DRILLS
CONTROL
MICROPROCESSORS
PERFORMANCE(ENGINEERING)
COLLECTION
FRAGMENTS
LAND ICE
GREENLAND
CORE SAMPLING
Danish equipment
Chips
Greenland
Cold Regions Research and Engineering Laboratory
Ice
Ice Sheet
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA082206
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA082206
Description
Summary:The 'Danish Deep Drill' was developed at the University of Copenhagen. The drill, which will be used to obtain ice cores from the Greenland Ice Sheet, was tested at the U.S. Army Cold Regions Research and Engineering Laboratory. The drill is battery-operated and has a down-hole microprocessor-based control section and a delicately balanced chip removal system. It is a lightweight, electro-mechanical drill designed to obtain a 10.2-cm-diameter core in 2-m lengths. There are potential problems in chip recovery and storage, malfunctions of the computer or batteries, leaks in the pressure chamber, spin-out or rotation of the drill, and the very close tolerances required by the drill design. Tests are recommended that will help eliminate some of these potential problems and determine the drill's overall strengths and weaknesses. The drill is a very complex and delicate instrument that will require constant maintenance, modification and monitoring when in use. (Author)

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