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Proceedings Paper

Elimination of helicoid silhouette double value
Author(s): Shikai Wang; Hong Liang
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Paper Abstract

The silhouette method is one of the main methods for measuring flank angle of a helicoid But some methodology errors exist in this method two different results can be obtained theoretically at the same place of the spiral surface if exchanging the mounted direction of checked lead screw or rotating it through 1800 around its axis. This phenomenon is the double-value property of measurement results. In this paper the cause for the phenomenon and the relationship between the error and the parameters of helicoid are described. The double-value property of measurement results can be eliminated if measuring flank angle of helicoid by means of an optical system with an inclinable reticle The theory main properties and experimental results concerning the flank angle of lead screw by the new optical system are presented. I. HELICOID SILHOUETTE DOUBLE-VALUE Helicoid is a very important camber and a component of the lead screw worm tools and gauges. The silhouette method is one of the main methods for measuring helicoid but the doublevalue phenomenon exists in this method. A group of experiment results is given in Table. 1. It can be seen that the quantity of the double-value errors is too big to satisfy the requirement of measurement accuracy for mo s t lead screws ''lab. 1. Helicoid silhouette double value Measurement of axial flank angle UMM 200 by using traditional silhouette method part PWF30

Paper Details

Date Published: 22 September 1993
PDF: 4 pages
Proc. SPIE 2101, Measurement Technology and Intelligent Instruments, (22 September 1993); doi: 10.1117/12.156480
Show Author Affiliations
Shikai Wang, Shanxi Institute of Mechanical Engineering (China)
Hong Liang, Shanxi Institute of Mechanical Engineering (China)

Published in SPIE Proceedings Vol. 2101:
Measurement Technology and Intelligent Instruments
Li Zhu, Editor(s)

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