screw axis

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screw axis

[′skrü ‚ak·səs]
(crystallography)
A symmetry element of some crystal lattices, in which the lattice is unaltered by a rotation about the axis combined with a translation parallel to the axis and equal to a fraction of the unit lattice distance in this direction.
References in periodicals archive ?
Festo Launches Ball Screw Axes with Recirculating Ball Bearing Guide EGSP and EGSK
The instantaneous screw axes of two parameter motions
On The Instantaneous Screw Axes of Two Parameter Motions, Facta Universitatis, Series, Mechanics, Automatic, Control and Robotics, 6(2007), No.
3], with six screws driven perpendicularly to the timber grain, in pre-bored holes, in distances of at least 60 mm (6d) between screw axes.
There is also little information on the evolution of methyl methacrylate grafting within and along screw axes.
The screw diameter is 30 mm, the distance of two screw axes 26 mm, and an active barrel length is 975 mm (L/D = 32.
Besides the work of Kim and White [23] there has been little information on evolution of maleic anhydride grafting and along the screw axes.
The screw diameter is 30 mm, the distance between the two screw axes 26 mm, and an active barrel length is 975 mm (L / D = 32.
The screw diameter is 30 mm, the distance of the two screw axes is 26 mm, and the active barrel length is 975 mm (L/D = 32.
Cross sections I and II are the cross sections perpendicular to the screw axes across the mid-point of the side gap and across the mid-point of the calendar gap as shown in Fig.
If the distance between the screw axes is less that the diameter at the tip of the screw flight, then one screw intermeshes with the other and thus provides an intermeshing twin-screw extruder.
The cross section of the screws in a plane that winds along the helical path and that is at an angle of [Theta], the screw helix angle, to the plane perpendicular to the screw axes is shown in Fig.