Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000401
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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FLEXIBLE DRIVE SHAFTS— THEIR APPLICATION TO SOUND PICTURES J. C. SMACK* Before describing the actual applications of flexible drive shafts to motion picture equipment, it might be well to give you as briefly as possible a general description of flexible shafts and their characteristics. Although there are over thirty million feet of flexible shafting used yearly in practically every type of industry in this country, engineers as a whole are not generally familiar with the technical characteristics of this product. Flexible shafts are manufactured in all sizes from 0.041 inch to 0.750 inch in diameter and larger. They are built up of wires usually in strands of four, wound in superimposed layers. The direction of the lead or pitch of the successive windings alternates and the wires are of graduated sizes, increasing with the layers. The material itself is a special grade of steel music wire of high tensile strength and may be wound in any number of layers from two to nine, according to the type and size of flexible shaft desired. Shafts of widely varying characteristics may be produced by different combinations of wires, by differences in number of layers, and subsequent heat treatment. Irrespective of diameter, flexible shafts are regularly made in two general types, classified as grade "H" and grade "S." The grade "H" flexible shaft has high torsional strength, or resistance to twisting strain, and is adaptable to the majority of uses. Grade "S" shafting has greater flexibility than grade "H" and is usually used where extreme flexibility is the deciding factor. Various other grades are also supplied for special applications. Flexible shafts are wound for maximum efficiency when rotating in one direction. The pitch direction of the outer layer of wires determines the direction of rotation in which the shaft will give the best results. A shaft should be rotated so that the tendency is to * S. S. White Dental Mfg. Co., N. Y. City. 384