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Outside Diameter of Helical gear

Question asked by Tran Thedanh on Apr 26, 2013

i take a helical gear in toolbox of solidwork 2012:



I choose Helix angle with many value defferent, Outside diamater (da) of helical gear will change...

With: helix angle=5 (Z47,m6), da=294mm

With: helix angle=25 (Z47,m6), da>400mm

Why did it happen so?