Let's Make Robots!

Gears in Sketchup

In robotics, you  usually want more torque or speed out of your motors. You can achieve  this by using gears.
But how can you get them?
You could carve them out from wood or plastics, or use a 3D printer.
On my current robot, I would need 4 equally big gears. So I'll show you how to design them.

Tools needed:

  • printer

Materials:

  • paper

Software:

Step 1:
Drawing the gear.

Once, you have copied the plugin and restarted Skechup (Template == product design and woodworking - millimeters
(Sorry Americans)),go to the Draw window, and select Involute Gear.

  
You probably get, how do set the gear. If you want to be more specific, chose Key Involute Gear.
I'll get some pressure angels here, so you'll know, how they look.
14,5°                                            20°:                                             25°:

             

And here are all three, if they seem look a-like: My gear (the gear doesn't need to be 3D): 

                                        

Step 2: 
Printing the gear:
(Use Parallel Projection (not perspective) and the top view) 

 

Printing preferences:
(Fit to page and Use model extents are unchecked! Set the scale 1:1) 

 

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I have just started learning Sketchup and found your Sphere and gears plugins to be exactly what I needed for some new projects.

I'm glad to hear that :)

I have just started learning Sketchup and found your Sphere and gears plugins to be exactly what I needed for some new projects.

I thought I might add to this:

Not gear in sketchup, but in case anyone's looking for gear templates (aplogies if this is listed elsewhere)

http://woodgears.ca/gear_cutting/template.html

 

Good for making humungous gears, but not so useful for smaller ones.

Nice. Using this Involute Gears it is possible to create gears in Sketch-up. I was looking for that for a while.

But what I miss is the gear transmission support. Would'nt be nice if the tool lets you make gears with the same module so the teeth match but the size can be altered? You know what I mean?

To make a transmission gear the diameters must vary from small to large but the teeths must always match.

Nevertheless... this post would make a good Tip.

PS: Involute Gears works with Sketchup 8 too.