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by oldestfox
Tue Jul 30, 2013 10:11 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

OK. It looks like this topic is getting blown all out of proportion. And I think that it all comes from there being 2 views for the use of FreeCAD. View 1 if from the machinist. View 2 is from the 3D printer operator. A machinist would never be happy with a CAD program with only .01mm precision, whe...
by oldestfox
Sun Jul 28, 2013 8:50 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

I did not constraint the center point of the arcs. And that is because they had to move. An arc can be considered to be (for lack of the correct term) constant, in that if you extend an arc, it will meet it's own tail. Not so with an involute. It will have an ever increasing radius at any point alo...
by oldestfox
Sat Jul 27, 2013 6:14 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

No. I was just trying to show the difference between arcs and a spline for the novices. I constructed the arc version, keeping the true involute dimensions. That required *not* making the arcs tangent to one another. If had made them tangent, then the curve would have progressively moved toward the ...
by oldestfox
Fri Jul 26, 2013 8:22 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

http://en.zimagez.com/miniature/arcinvolute.jpg http://en.zimagez.com/miniature/splineinvolute.jpg If you look close at the "arc involute" you will see what I mean by being different. The involute is "bumpy", as it should be with arcs. As I also said, it may not make a bit of difference. Will depen...
by oldestfox
Fri Jul 26, 2013 7:24 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

After having drawn the gear with the pitch dia. and pitch correct, I would think that even just the first arc would be more than long enough. Trouble is that if you are really going to use that tooth profile, an arc will not mesh and unmesh like an involute will. It's probably a mute point anyway in...
by oldestfox
Fri Jul 26, 2013 7:19 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

Like I said, I was doing my write-up from memory. After seeing your post, that is how I did it. With the tangent lines. Not the radials directly. I still used a spline however. I will replicate this construction in Alibre and see how much difference there is. Size each radial with the "radius + circ...
by oldestfox
Fri Jul 26, 2013 6:09 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

Given Alibre's history of "capability removal" with "upgrades" and increasing pricing, I have my reservations on how much longer I will stay with 3DSys. :roll:
by oldestfox
Fri Jul 26, 2013 5:26 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

Oh, btw.
Hat's off for that tapered cone trick for a spiral. Well done.
by oldestfox
Fri Jul 26, 2013 5:25 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

Have you seen my trick about flattening a tapered helix to approximate a spiral? Yes. I think I would have to use "sweep boss" in Alibre if I were working with cones. I don't think the "helix boss" could handle the cone. I never tried to draw a "tapered helix". btw... boss = pad, cut = pocket. I ha...
by oldestfox
Fri Jul 26, 2013 4:26 pm
Forum: Developers corner
Topic: involute gear generator preview
Replies: 129
Views: 28729

Re: involute gear generator preview

Norman, just to sate your curiosity...

Alibre has a spiral tool. :D

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