AutoCad :: Connect Points To Draw Involute For Gear Tooth

Nov 25, 2012

I am drawing a gear and now i need to connect points to draw involute for a gear tooth: [URL] ...

Points are numbered. I'm trying to draw with a spline, but i don't know where to put last point of a spline to draw an exact involute - like for example - if i would draw like this and press enter - i would get this spline: [URL] ...

But if i would move cursor in a different direction and then press enter - i would still get almost identical spline, but still, not the same: [URL] ...

So how do i draw an accurate involute? Maybe i should draw one more point and then stop drawing spline?

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[URL] .......

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Should also have something that handle a ESCAPE hit or cancel, something like this:
 
(defun trap1 (errmsg) (command "_.undo" "_end") ; undo end (setvar "osmode" oldsnap) ; restore variables (setvar "cmdecho" 1) ; enable cmdecho (setq *error* temperr) ; restore old error handler (prompt "

[Code] ....

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