Results 111 to 120 of about 91,634 (167)
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Proceedings of the Institution of Mechanical Engineers, 1951
The paper describes the various commercial methods of producing screw threads by cutting, rolling, grinding, and milling. The operating principles on which the several processes depend are dealt with and their advantages and limitations are discussed. A workshop method of determining the torque required for tapping and for threading is described, and
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The paper describes the various commercial methods of producing screw threads by cutting, rolling, grinding, and milling. The operating principles on which the several processes depend are dealt with and their advantages and limitations are discussed. A workshop method of determining the torque required for tapping and for threading is described, and
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On Displacing a Screw about a Screw
2002We derive, using compact vector methods which do not rely on Kotel’nikov’s principle, the dualised “Rodrigues formula” which is a well-established expression for the screw that has suffered a screw displacement from a known initial location. An alternative perception — that the screw has suffered rigid-body rotation through a dual angle — is examined ...
I. A. Parkin, J. E. Baker
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Capture of the screw during percutaneous screw insertion
Injury, 2004The simple technique to maintain the engagement of the screw and the screw driver during percutaneous locking screw insertion is presented. The method can capture the screw when the screw becomes disengaged. This will be helpful when percutaneous screw insertion is performed in the narrow and deep location of the bone such as a locking screw at the ...
Banchong, Mahaisavariya +2 more
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Cannulated screws for odontoid screw fixation and atlantoaxial transarticular screw fixation
Journal of Neurosurgery, 1995✓ Cannulated screw systems use thin Kirschner wires (K-wires) that have been drilled into the bone to direct screw trajectories accurately into small bone fragments. Use of the K-wires avoids overdrilling the pilot holes and allows fixation of adjacent bone fragments during screw insertion. Hollow tools and hollow screws are inserted into the bone over
C A, Dickman +3 more
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The Journal of Hand Surgery, 2006
To assess the biomechanical stability relative to screw length and K-wire augmentation in scaphoid fracture fixation using a flexibility testing protocol and cadaver scaphoids whose soft tissue attachments remained undisturbed. Our hypothesis was 2-fold: increasing screw length and augmenting fixation with a K-wire would improve fracture fragment ...
Seth D, Dodds +2 more
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To assess the biomechanical stability relative to screw length and K-wire augmentation in scaphoid fracture fixation using a flexibility testing protocol and cadaver scaphoids whose soft tissue attachments remained undisturbed. Our hypothesis was 2-fold: increasing screw length and augmenting fixation with a K-wire would improve fracture fragment ...
Seth D, Dodds +2 more
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1984
Our next subject will be the ship screw which is upto now the most important device for hydrodynamic propulsion. It consists of a number of helicoidally shaped blades connected to a hub. The number of blades can vary from two upto about six. The hub is mounted on a shaft (figure 3.1) which is rotated by the engine.
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Our next subject will be the ship screw which is upto now the most important device for hydrodynamic propulsion. It consists of a number of helicoidally shaped blades connected to a hub. The number of blades can vary from two upto about six. The hub is mounted on a shaft (figure 3.1) which is rotated by the engine.
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The Mathematical Gazette, 1957
A helicoid is the surface generated by a curve which is simultane rotated about a fixed axis and translated in the direction of the axis w velocity proportional to the angular velocity of rotation.[1] An Archime Screw [2] is strictly a finite helicoid in which the generating curve is c (and ...
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A helicoid is the surface generated by a curve which is simultane rotated about a fixed axis and translated in the direction of the axis w velocity proportional to the angular velocity of rotation.[1] An Archime Screw [2] is strictly a finite helicoid in which the generating curve is c (and ...
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Journal of Robotic Systems, 2003
AbstractThis study in projective geometry reveals that the principle of duality applies to the screw. Here, the screw is demonstrated to be an element of a projective three‐dimensional space (P3), right alongside the line. Dual elements for the screw and line are also revealed (the nut and spline).
Michael Griffis +1 more
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AbstractThis study in projective geometry reveals that the principle of duality applies to the screw. Here, the screw is demonstrated to be an element of a projective three‐dimensional space (P3), right alongside the line. Dual elements for the screw and line are also revealed (the nut and spline).
Michael Griffis +1 more
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Screw Polygons, Finite Screws, and Biquaternions
Volume 1B: 25th Biennial Mechanisms Conference, 1998Abstract In this contribution, the close relationship between screw polygons, finite screws, and biquaternions is elucidated. Further, it is shown that a reinterpretation of screw polygon problems in terms of biquaternions leads to a simple and straightforward solution of the direct problem of screw polygons.
José María Rico M. +2 more
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Investigation of labyrinth-screw and screw seals
Chemical and Petroleum Engineering, 1985also the optimum flow rate of the cooling liquid (90-120 liter/h for seals with unified friction rings of siliconized graphite SG-P). The investigations showed that with the given design of the seal, heat removal is efficient and its operation stable.
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