A simple definition of a cycloid : It is the curve traced by a point on the rim of a circular wheel as the wheel rolls along a straight line without slippage. That is where it ends with this beast though.
Most of us enjoyed the intricate drawings created by a Spirograph toy as kids. While it was easy to understand how to use it, the math behind the device was surprisingly complex. The series of hole filled gears created roulette curves technically known as hypotrochoids and epitrochoids. Now Portland-based toymaker and designer Joe Freedman has created a hand-cranked machine which puts even that complexity to shame. His Cycloid and PrimoGraf drawing machines are a pattern and geometry lovers dream come true.
“Our Cycloid Drawing Machine has infinite adjustments to allow for a fulcrum that rotates and moves. Gone are the simple rotary drawings of old. The Cycloid Drawing Machine allows for massively complex artwork. By allowing the fulcrum point to move and having a huge number of interchangeable gears our drawing machine is more like an engine turning lathe.”
Cycloids are used in machine design, architectural design, violin plate arching etc. Here is how it works.