<p>I read this question a few months ago, and thought I knew what you wanted.  Re-reading it now confuses me a little.</p>
<p>But, I think you may be asking for a large, flat surface with a spiral in it, like the tightening mechanism in a 3-jaw chuck.  In effect, are you using the large cylinder as a worm gear to drive four gears which ride on it?</p>
<p>I thought you wanted more general bevel gears, and today I found a package in OpenSCAD that looks quite good.  it is found at: <a href="https://github.com/dpellegr/PolyGear" rel="nofollow noreferrer">https://github.com/dpellegr/PolyGear</a></p>
<p>If this is the answer you were looking for, great.  If not, please comment here and I will delete this answer.</p>

CC BY-SA 4.0
2020-09-10T16:03:33.653Z
Wow, saving that link.
R.. GitHub STOP HELPING ICE
CC BY-SA 4.0
2020-09-10T01:12:55.210Z
2020-09-10T01:12:55.210Z
cmm
<p>I'm trying to design a "Lifting Table" in OpenSCAD which will consist of 2 concentric cylinders. On the inner cylinder I plan to mount 3 un-powered bevel gears vertically plus a 4th powered  one each at the proper location/angle to interface with external cylinder's spiral bevel gear and keep the external cylinder level. </p>

<p>OpenSCAD's involute_gears library makes a bevel gear pair that is close to what I need, but the bigger gear is flat instead of a spiral.  How can I get the bigger gear to be a spiral and more than one rotation (level) 720 degrees for example? </p>

CC BY-SA 4.0
2019-12-29T18:50:51.173Z
Did you get the parametric file for OpenSCAD? Have you found the parameters which represent the change you'd like to make?
fred_dot_u
CC BY-SA 4.0
2019-12-29T23:30:24.990Z
I think I did, I'm using involute_gears.scad for the parametric file. I have not found parameters to make a spiral gear.
Alan Kwiatkowski
CC BY-SA 4.0
2019-12-30T00:00:29.650Z
What I picture you are seeking is a large diameter worm gear pinion (bigger gear in your question) but with teeth instead of a flat surface. That's going to be quite challenging!
fred_dot_u
CC BY-SA 4.0
2020-09-10T07:47:30.960Z
Are you looking for a library like [this parametric "Gears Library for OpenSCAD"](https://www.thingiverse.com/thing:1604369)?
0scar
<openscad>
Spiral bevel gears in OpenSCAD
Alan Kwiatkowski
# Spiral bevel gears in OpenSCAD

(Asked by: username_0 on 2019-12-29)

I'm trying to design a "Lifting Table" in OpenSCAD which will consist of 2 concentric cylinders. On the inner cylinder I plan to mount 3 un-powered bevel gears vertically plus a 4th powered one each at the proper location/angle to interface with external cylinder's spiral bevel gear and keep the external cylinder level.

OpenSCAD's involute\_gears library makes a bevel gear pair that is close to what I need, but the bigger gear is flat instead of a spiral. How can I get the bigger gear to be a spiral and more than one rotation (level) 720 degrees for example?

**Tags:** openscad
> **Comments:**
> **username_1**: Did you get the parametric file for OpenSCAD? Have you found the parameters which represent the change you'd like to make?  
> **username_0**: I think I did, I'm using involute_gears.scad for the parametric file. I have not found parameters to make a spiral gear.  
> **username_1**: What I picture you are seeking is a large diameter worm gear pinion (bigger gear in your question) but with teeth instead of a flat surface. That's going to be quite challenging!  
> **username_2**: Are you looking for a library like [this parametric "Gears Library for OpenSCAD"](https://www.thingiverse.com/thing:1604369)?  

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## 1 answers

### Answer by username_3 on 2020-09-10. Score: 3

I read this question a few months ago, and thought I knew what you wanted. Re-reading it now confuses me a little.

But, I think you may be asking for a large, flat surface with a spiral in it, like the tightening mechanism in a 3-jaw chuck. In effect, are you using the large cylinder as a worm gear to drive four gears which ride on it?

I thought you wanted more general bevel gears, and today I found a package in OpenSCAD that looks quite good. it is found at: <https://github.com/dpellegr/PolyGear>

If this is the answer you were looking for, great. If not, please comment here and I will delete this answer.

> **Comments:**
> **username_4**: Wow, saving that link.  

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