Intermittent Motion Geneva Wheel.  I made it in TechShop
Intermittent Motion Geneva Wheel.  I made it in TechShop
Intermittent Motion Geneva Wheel.  I made it in TechShop
Intermittent Motion Geneva Wheel.  I made it in TechShop
Intermittent Motion Geneva Wheel.  I made it in TechShop
Background:
Generva wheel is widely known mechanism to produce intermittent motion. Though the input from a motor at constant speed is continuous. The motor driving the driver wheel will rotate the driven wheel at intermittent motion. The one we selected to make is a 4 to 1 ratio. The driver wheel will 4 revolutions and the driven wheel will make 1 revolution. Each quarter turn is intermittent. There will be a period of no movement follow by a swift quarter turn.

Goal:
To make intermittent motion using Geneva Wheel.

Procedure:
This is 1st test for my Geneva Wheel project. So I like to use some scrap plywood and cut them on Epilog laser cutter. I will use super glue to join the shaft of the driver and driven wheel.

Source:
http://en.wikipedia.org/wiki/File:Internal_Geneva_wheel_ani_220px.gif

Results.
The project is a success. We are able to produce the parts and do intermittent motion.

Lesson Learned.
* There are several way to design a 4:1 ratio intermittent wheel. There likely to be pros and cons. The pros on this one is that it has a big platform that one could put an object to take picture. The shaft of the driven wheel become too small. At this time, we produced a functional Geneva Wheel. In the next intructable, I will add more variations and provide some design analysis.
* Though, the driven wheel originally shown in Wickipedia would work, it require some modification to be functional. The revised drawing is shown last.
* To be durable, it is best to make the driver wheel in 3D printer. The center shaft also is best 3D printed.
* Overall, this is a great way to do 4:1 ratio. It occupies the smallest footprint. This Geneva Wheel has its own unique characteristics and functionality.

Intermittent Motion Geneva Wheel.  I made it in TechShop
geneva_4a2.cdr435 KB
 
 

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