Proposals for 16-mm and 8-mm Sprocket Standards

On Nov. 8, 1945, the chairman of the SMPE Standards Committee appointed a Subcommittee on 8-Mm and 16-Mm Projector Sprockets with the task of revising the present American Standards for sprockets. The personnel of the subcommittee is Otto Sandvik, chairman; Herbert Barnett, John A. Maurer, Lawrence T. Sachtleben, and Malcolm G. Townsley. This paper, however, is not a report by the members of the subcommittee, but is material prepared for their consideration. — The ASA Sectional Committee on Motion Pictures, Z22, had earlier referred the sprocket standards to the Standards Committee for reconsideration, suggesting that the specifications should be in equation form. In this paper, the authors have followed this procedure and are submitting proposals for a new standard, as shown in Fig. 1. Formulas are given for the root diameter of the sprocket and for the thickness and shape of the tooth. In these formulas due allowances are made for variables such as the pitch of the film, the path of the film, and the number of teeth on the sprocket. Careful consideration is given to lateral dimensions. — Members of the Society and others interested in sprocket design are urged to read this paper and Dr. C. F. Vilbrandt's paper, beginning on page 521 of this issue, and to submit their comments to Boyce Nemec, SMPE Engineering Secretary.

Print ISSN

0097-5834

Published

1947-06

Content type

Original Research

DOI

10.5594/J17832