Copyright WWW.DBBP.COM | updated 3-May-2004
Because of the very large amount of questions I get about my Cadbike images, I will try to explain what they are and how I make them. I will start with a very general and short discription and gradually add more in-depth information.
How to make a CAD-bike:
I start with a "skeleton part". A skeleton part is a part that is built up entirely out of datum planes and datum axis ( and sometimes datum curves, datum points and datum coordinate systems)
Okay, and what are those?
Datum geometry is geometry that exists only for reference purposes and has no mass, no color, no material properties. It can also be switched on and off very easily.
The skeleton part contains the positions of front and rear wheel (the wheelbase) and also the angle of the steering head, the trail and the engine centerline (which is very important for determining the center of gravity and ground clearance). It is the first part in the assembly, and in the skeleton part I can already predict the handling characteristics of the bike. The picture below is of the skeleton part I used to design Cadbike #14:
Usually I assemble the wheels, engine and gearbox next and then start
sketching the frame.
To be continued....
Maybe these articles will inspire others to use their
computers to design bikes,