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What's the meaning of "D+f" on hob? I know "WD" means whole depth. "D+f" seems the same.

Can 3D surfaces be edited like solid? subtract or union, or trim.

Gear transmission is the transmission of two partial spheres which have their own centers and axles. I believe the spur gear is the particular condition of bevel gear, when the apex is at the infinite distance and the shaft angle is 0. So equations for bevel gear can be used for spur gear. So I...

I hope that data validation refer cells from another sheet, but I can not make it. :-(

I usually define a cell a long formula, that cause the function edit area displayed not enough, and cover the column title and some first row. Can I get the area larger?

I do not know much about terms of gear in English. Sorry. What's the tip relief angle of gear shaper for? machining requirment. right. one of them. and one more, after shaper resharpenning, keep the root of gear unchanged. right? if you agree, then, theoretically, the angle will not be always...

Thanks gearcutter first for his introduction of this forum. I've posted this title in some forums, but almost no respond. Do you think the formula Mdp=2*rM*cos(pi/(2*z))+dp is right? Mdp -Measure over pins or balls rM -Distance from pin center to gear center. rM can be caculated out...