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Thank you, lbmakem

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

ok, tomorrow I will call them, see if any help.

I am Chinese, and in China now. if need any help, just let know.

hi, man, how to attach pic on this?

The curve diamondjim created is right. If you want it more accurate, just set the variant "pnts" bigger. There are several involute equations, his is right. Here below I attached a lisp file which creates involute curve only, it can also create "short" or "long" involute, that means: the curve...

Thanks for all your comments. I will try. Thank you CarlB, M2s works.

I am working on a surface which a 3D curve revolves along another straight line, and I want cut this surface with a plane to see the intersection. But solid can not do the job.

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

Hi, Gearman The gear we cut with shaper was an internal ring gear, after resharpening (like you said, it was to certain nagative value), the root diameter got smaller, the tip of planetry gear hit the root. The shaper cutter had a too big tip relief angle. here below is my post about this...

Hi, ERT Thanks for your concern, and your advice. I am an assembly processsing engineer, designing tools to assemble gear boxes. Our factory makes spur and helical gears. I think to understand gear by geometry is the base of all other respects. And all respects of gear are associated: too thin...

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 believe that will be the same as press lock and press release, just inverse the direction of it. You can see a kind of ball pen anyway, press the tip out, and press the tip back. disassemble it and see what's inside.

It works. Thanks a lot!

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

Thanks all above. NormPeterson gives a wise workaround.

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?

The following is my suggestion about this gear set, use 22 teeth standard planet gears only, to make sun and ring gear as new. data are in metric: sun pinion z1=13 x=+0.593 ring gear z3=59 x=-0.373 center distance a=152.4 you can set the planet gears in 3 or 4, both are ok. but you need a...

If you design this device as new, I suggest you have the teeth number arranged this way: z1+2*z2+1=z3 (z1+z3)/n=integer this equation I have mentioned above z1 number of teeth of sun gear, z2 number of teeth of planet gear, z3 number of teeth of ring gear, n number of planet gears, placed in...

gearcutter, the last correction is right, yes, "the angle of this helix is not equal to that of the helix through the contact points" I agree with most of Michael Ignat's ideas, but his 4th opinion is not accurate, the value may not be always larger than that calculated for two balls in a...