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Cutting a single helical groove into a screw-stock cylinder yields what is referred to as a single-thread screw. Similarly, one may construct a double-thread screw provided that the helix angle of the two cuts is the same, and that the second cut is positioned in the uncut material between the grooves of the first.
Cylinder, head, and sector of a hard drive. Cylinder-head-sector (CHS) is an early method for giving addresses to each physical block of data on a hard disk drive. It is a 3D-coordinate system made out of a vertical coordinate head, a horizontal (or radial) coordinate cylinder, and an angular coordinate sector. Head selects a circular surface ...
This article uses the standard notation ISO 80000-2, which supersedes ISO 31-11, for spherical coordinates (other sources may reverse the definitions of θ and φ): . The polar angle is denoted by [,]: it is the angle between the z-axis and the radial vector connecting the origin to the point in question.
piston pin velocity (upward from crank center along cylinder bore centerline) a {\displaystyle a} piston pin acceleration (upward from crank center along cylinder bore centerline) ω {\displaystyle \omega } crank angular velocity (in the same direction/sense as crank angle A {\displaystyle A} )
In mechanics, a cylinder stress is a stress distribution with rotational symmetry; that is, which remains unchanged if the stressed object is rotated about some fixed axis. Cylinder stress patterns include: circumferential stress, or hoop stress, a normal stress in the tangential direction.
The scalar moment of inertia, , of a body about a specified axis whose direction is specified by the unit vector ^ and passes through the body at a point is as follows: [7] = ^ (= []) ^ = ^ ^ = ^ ^, where is the moment of inertia matrix of the system relative to the reference point , and [] is the skew symmetric matrix obtained from the vector =.
The Fuller calculator, sometimes called Fuller's cylindrical slide rule, is a cylindrical slide rule with a helical main scale taking 50 turns around the cylinder. This creates an instrument of considerable precision – it is equivalent to a traditional slide rule 25.40 metres (1,000 inches) long.
The Hotine oblique Mercator (also known as the rectified skew orthomorphic or 'RSO' projection) projection has approximately constant scale along the geodesic of conceptual tangency. [1] Hotine's work was extended by Engels and Grafarend in 1995 to make the geodesic of conceptual tangency have true scale. [ 2 ]