A Handy Lead Tester for Leadscrews

Generally speaking, measurement of lead error of long leadscrews by a conventional optically equipped length measuring machine is troublesome and inefficient. This seems to be the reason why every leadscrew that is produced is not always inspected.A. Yamamoto, one of the authors, has previously investigated a leadscrew measuring machine with automatic recording equipment with the cooperation of Mitsui Precision Machinery and Engineering Co., Ltd. The machine, however, must be installed in an air-conditioned measuring room as before mentiond length measuring machine.A handy leadscrew tester investigated by the authors can be used not only in a measuring room but also for the leadscrew mounted on a screw cutting lathe. It is composed of a measuring head and an electronic recording equipment, and variation of cumulative pitch error and drunkenness of lead can be automatically measured respectively.This paper covers the explanation of experimental research carried out at the Laboratory of Precision Machinery and Electronics and the introduction of the machine industrialized by the Tokyo Sokuhan Co., Ltd.