Dr. Hesham A. Hegazi

STANDARD MACHINE ELEMENTS

GEOMETRY IDENTIFICATION AND REDESIGN

Metwalli, S.M.*, Hegazi, H.A.**, Shalaby, O.***, and Moussa, Y.***

* Professor, ** Associate Lecturer, Department of Mechanical Design and Production, Faculty of Engineering, Cairo University, Giza 12316, Egypt. E-mail: [email protected] & [email protected] *** NASR Castings Company, Alexandria, Egypt.          E-mail :[email protected]

ABSTRACT

This paper presents a new procedure by which standard machine elements can be identified for redesign purposes. Standard elements or components need not be scanned as surface or solid model for identification. The standard character is sufficient to be identified by few parameters. These parameters can be measured or deduced by calculations from certain geometric relations. The procedure presented herein is devoted to the identification and redesign of spur, helical, and worm gears. Other standard machine elements can be treated the same way. A computer-aided program is used to satisfy all geometric constraints, identify other dependent geometry and define production and inspection requirements. It allows the further check of the design appropriateness of material selection and loading conditions.

 KEYWORDS

Geometry, Identification, CAD, Gears, Spur and Helical gears, Worm gears.