Results 271 to 280 of about 193,144 (316)
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The American Mathematical Monthly, 2012
AbstractWe solve the problem of designing a simple device that uses rotary motion to drill a hole with a cross-section that is a regular polygon with an odd number of sides: the main idea is to use a polygonal trammel and a family of rotors. By using different rotors, one can produce a hole with a cross-section that is in any proportion of the trammel ...
Barry J. Cox, Stan Wagon
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AbstractWe solve the problem of designing a simple device that uses rotary motion to drill a hole with a cross-section that is a regular polygon with an odd number of sides: the main idea is to use a polygonal trammel and a family of rotors. By using different rotors, one can produce a hole with a cross-section that is in any proportion of the trammel ...
Barry J. Cox, Stan Wagon
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Drilling Holes with the Bow-Drill
Technology and Culture, 1970miliar to most carpenters and joiners in Britain, which appears to corroborate the authors' analysis of the action of the ancient Egyptian stone-boring tool. Fitted preferably with a rosehead countersink bit, it is also used one-handed for countersinking. The rotation is started by tilting the brace, thus making use of the gravity couple similar to the
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In 2025, President Trump said in his inauguration speech at the US Capitol that we will “drill, baby, drill.” This remark was the beginning of the US retreat from the clean energy transition and the revival of US fossil fuel energy production and consumption.
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British Dental Journal, 1997
It is now widely recognised that dentistry based mainly on the restoration of teeth has failed to deliver dental health to our patients. There is an urgent need for GDPs to face up to the full implications of this failure and implement a truly preventive practice philosophy. We must also recognise the particular plight of our patients with very heavily
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It is now widely recognised that dentistry based mainly on the restoration of teeth has failed to deliver dental health to our patients. There is an urgent need for GDPs to face up to the full implications of this failure and implement a truly preventive practice philosophy. We must also recognise the particular plight of our patients with very heavily
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DRILL TIP AND DRILLING TOOL HAVING A DRILL TIP
2010The invention relates to a drill tip (2) comprising a base body (6) having chip flutes (22A,B) and extending in the axial direction along an axis of rotation (8) and having at least two main cutting edges (14A,B) on the front face thereof extending outward in the radial direction to a cutting corner (16A,B).
KENNAMETAL INC +2 more
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DRILL AND CHUCKING DEVICE FOR A DRILL
2008The invention relates to a chucking device (4) for a drill, wherein a chucking recess (14), surrounded by a side wall (17) and having a recess opening (21), is provided in the chucking device (4) for chucking an armature (9). In order to chuck an armature in the chucking device such that a relative displacement, and thus friction, is prevented between ...
FISCHERWERKE GMBH & CO KG, HAUG WILLI
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Significance and complications of drilling fluid rheology in geothermal drilling: A review
Geothermics, 2021Mahmoud Mohamed +2 more
exaly