Flexible roof drill for low coal. Final report
Contract number DE-AC22-74ET11205 provided for the continued testing of a flexible roof drill system which allows the operator to drill roof bolt holes longer than seam height. The system was mounted on a modified Fletcher LTDO bolting machine. The objective of the contract is to establish the reliability of the flexible drill from extended life testing in an operating coal mine and by laboratory life testing. The reliability goal is 1000 mean-holes-between-failures. The underground test was conducted in the GEX-Colorado, Incorporated, Roadside Mine in Palisade, Colorado. The underground test concluded with the drilling for and installation of 12,361 four-foot roof bolts. The laboratory test consisted of the simulated drilling of 20,000 eight-foot long holes. The reliability goal was achieved with an associated confidence level greater than 99%.
- Research Organization:
- Bendix Corp., Englewood, CO (USA)
- DOE Contract Number:
- AC22-74ET11205
- OSTI ID:
- 5411252
- Report Number(s):
- DOE/ET/11205-T10; ON: DE82006278
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
DRILLING EQUIPMENT
PERFORMANCE TESTING
RELIABILITY
ROOF BOLTS
INSTALLATION
COAL MINING
COAL SEAMS
MINING EQUIPMENT
RECOMMENDATIONS
THICKNESS
UNDERGROUND MINING
COAL DEPOSITS
DIMENSIONS
EQUIPMENT
GEOLOGIC DEPOSITS
MINERAL RESOURCES
MINING
RESOURCES
TESTING
012000* - Coal
Lignite
& Peat- Mining
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)