Hi all,

Add: SpurGearProfile script

That script should draw correct outline :) except there is quite small number of sample points per involute (the profile of the tooth).

That circle "provided by the gear spur profile script" is a 'pitch diameter circle' and was supposed to help you assembly a meshing gear.


Add: empirical way leaving plus/minus 0.1 mm of space

Yep, it's something what is called the backslash...

See this two animation; the first one shows meshing gear with an operating center distance correction and second one without it.

http://www.mech.uwa.edu.au/DANotes/gears/meshing/meshing.html#animation
http://upload.wikimedia.org/wikipedia/commons/c/c2/Involute_wheel.gif


Petr

ps: I am not expert on meshing gear, just had a quick look at my aged excercise books when I was writing that script :)

Here in theory