Servo motors cams, shafts, followers

Hi,

I need to build a mechanism to lift things with a servo motor. I’ve found this: http://technologystudent.com/cams/cam1.htm

I’v already done a simple one with cardboard and wood sticks, but I need something that holds the cam stronger. Right now the cam slips though the shaft when the object being lift is too heavy.

Where can I buy this components (like servocity.com) to assemble the mechanism? Or if the components are there, how do I assemble them?

Thanks,
Any help would be appreciated.

I imagine if you have a cam cut from wood or plastic you could fix it securely to the servo arms with a few small screws.

Post a photo of what you have tried - 1024pixels max

...R