Converting Circular Motion to Pendulum Motion: The Simple Crank-Slider Assembly

[chris2547]

Hi I want to build an upsidedown pendulum. My problem is what is the best/most used way of converting a circular motion (from the motor) to a pendulum motion.

Thanks

 

[mgb_phys]

Look up 'escapement' there have been lots of different ones invented over the years.

 

[chayced]

Neat upside down pendulum using magnetic kids toys:

http://www.youtube.com/watch?v=5Hhq-XFPAB0&feature=PlayList&p=243BBDADD65207C0&index=0&playnext=1

Not sure if that's the kind of thing you are looking for, but certainly worth the visit. Also you could do the same sort of thing with electromagnets and a magnetic pendulum. Then it would be self sustaining. Hmmm. Think I have an idea for my next project.

 

[minger]

It may be a little easier to build a simple crank-slider assembly, shown here:
http://en.wikipedia.org/wiki/File:Slidercrank_animation.gif

All you then need to do is connect the slider to another joint, which has a fixed pivot point. Then adjust your lengths to get the speed/angle sweep that you desire.

 

[chris2547]

Thanks the 'simple crank-slider assembly' was exactly what I was thinking of.