This is the SVG file of the nautilus logarithmic gear I designed and built my art pieces from. By default, I made the center hole big enough for a standard bearing. However, I also include the exact center point so you can adjust the center circle to be appropriate for whatever mounting hardware you plan to use.
My build video can be found here: youtu.be...
This file is for creators to import and manipulate to use on their CNC machines or laser engravers. If you don’t know how to do that, then please just do some research. I’m sorry, but I don’t have time to assist you.