Elliptic Gears

enhydra · 7 Mar 2013, 17:56

I was looking for a plugin, that helps generating elliptic gears. As long as I do standard gears, I am fine with the involute gear plugin . So I sliced two different gears and merged them (see image below). But is there a proper way to generate an elliptic gear?

Chris Fullmer · 7 Mar 2013, 18:15

I'm going to guess that if the involute gear plugin does not support elliptic gears, then there probably is no plugin for it.

You could contact CADalog and see if they'll incorporate it though.

pilou · 7 Mar 2013, 18:36

there is link inside the text
Don't know if it's free and the export format

enhydra · 7 Mar 2013, 18:42

Hi

@unknownuser said:

there is link inside the text
Don't know if it's free and the export format

I know this tool. It seems promising. But the guy has not decided yet, how he wants to publish it. By now there is no export format.

Regards
Kurt

gilles · 7 Mar 2013, 20:01

Component Stringer could help.

http://sketchucation.com/forums/viewtopic.php?f=79&t=48477&hilit=component+stringer#p435378

Gaieus · 7 Mar 2013, 20:19

@gilles said:

Component Stringer could help.

http://sketchucation.com/forums/viewtopic.php?f=79&t=48477&hilit=component+stringer#p435378

Component stringer AND Ddider's ellipse plugin: http://rhin.crai.archi.fr/rld/plugin_details.php?id=124
as it makes ellipses with equal segments.

Jean Lemire · 8 Mar 2013, 14:42

Hi enhydra, hi folks.

In your image, you show two small circular gears meshed with a larger elliptical one.

For this to work, you need a way to accomodate changes in axis distance.

Normally, elliptical gears are meshed with other elliptical gears.

See this web page for some formula:

http://www.technicaljournalsonline.com/ijaers/VOL%20II/IJAERS%20VOL%20II%20ISSUE%20I%20%20OCTBER%20DECEMBER%202012/225.pdf

You will see that defining the exact shape for the teeth is not so simple.

Just ideas.

pilou · 8 Mar 2013, 15:07

Even not elliptical gears are no so simple too
38 parameters!

Jean Lemire · 8 Mar 2013, 19:04

Hi Pilou, hi folks.

You are right. Imagine with square gears. Yes, they exist.

See this page:

Non-circular gear - Wikipedia

(en.wikipedia.org)

And this one for even more strange looking shapes for gears. Look for the fish shaped one at mid length. Really funny.

Just ideas.

enhydra · 8 Mar 2013, 19:55

@gilles said:

Component Stringer could help.
http://sketchucation.com/forums/viewtopic.php?f=79&t=48477&hilit=component+stringer#p435378

Thanks for replying

@gilles & by Gaieus: I will take a look at these two plugins. Hope they do the job.

@Jean Lemire:

@unknownuser said:

you need a way to accomodate changes in axis distance

Yes, I am aware of that. Take a look at http://skfb.ly/5k3ecba . A rubber band will press the smaller gear towards the elliptic gear.
You get the point: Dealing with gears is quite challenging. But

@Pilou
I am not bothered by all of the 38 parameters.

pilou · 8 Mar 2013, 20:24

Terrific gears indeed!
And crazzy wood clocks

enhydra · 8 Mar 2013, 20:36

@unknownuser said:

Terrific gears indeed!
And crazzy wood clocks

I wish I had a laser cutter in the basement.

Pixero · 8 Mar 2013, 22:18

Kind of reminds me of the intro to the old Swedish TV show Tekniskt Magasin.

driven · 9 Mar 2013, 00:37

11mb and v6
https://dl.dropbox.com/u/25114184/Clark_67.skp

edit forgot to add superelipse plugin may help http://sketchucation.com/forums/viewtopic.php?t=29061

enhydra · 17 Mar 2013, 11:56

Unfortunately the plugin "Compnent Stringer" won't work for this kind of problem. Especially if you are interessted in a proper solution. For makers and tinkerers the plugin and also my way are good enough.

Look at: http://www.thingiverse.com/thing;57771

gilles · 17 Mar 2013, 16:01

For those who enjoy fine mechanics:

http://kmoddl.library.cornell.edu/model.php?m=689&movie=hide