-Clockworks
...Grasshopper Clockwork
...Inertia Clockwork
.........Gear Cutting
.........Sample Gears
.........Rotary Table
.........Parts Disassembled
.........Escapement Revealed
...Simplicity Clockwork
...Gear Machine Clockwork
...Concentricity Clockwork
-Eggs
...Egg Drawing Machine
...Brown Eggs
...Green Eggs
...Fun With Trigonometry
-CNC
...The Milling Machine
...Inside the Controller Case
...Rear of Controller Case
...The Interface Board
-ProTrac Support
Designed and built by Ed Legler, 2001.
elegler@edlegler.com
The idea came from a photo seen in Fine Woodworking, spring, 1978 of a design by David and Marji Roy of Ashford, CT.
To see David Roy's work:
http://www.woodthatworks.com/
The frame is about 14 inches across. The pieces were made using a scroll saw, drill press, and router.
A marble egg shaped weight hanging on the lower pulley drives an escape wheel.
The rotating flywheel raises and lowers a lever in a yo-yo motion that lifts a detent lever from the escape wheel once every four seconds with 1-1/4 flywheel turns each direction.
This version runs for approximately one hour depending on the length of the "yo-yo" string and the available distance for the weight to fall.
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