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Comparison on precision of helical gear building methods in Pro /E

LI Kang,LI Wan-li (College of Mechanical Engineering,Tongji University,Shanghai 201804,China)  
With the aim of constructing helical gear precisely in Pro/ENGINEER, the tooth form parameters must be utilized to control the tooth shape and the RELATIONS tool is needed to establish the relations among primitive parameters, dependant parameters and dimensions of the gear; in addition, the involute and the spiral trajectory shall both be created through equation. By theoretical analysis and application of functions, it is always possible to note the essential differences or the subtle distinction among those various model building strategies and pick the most precise and the most efficient one as well.
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