Parametric shaft hub

Parametric hub generator to attach a shaft to a flat surface.

Variables allow you to customize:
* Mounting style (clamp onto shaft; set screw onto shaft; plain for press fit)
* Base diameter
* Base height
* Shaft clamp wall thickness
* Shaft clamp height
* Shaft diameter
* Number of mounting holes (if any)
* Fine tuning of lateral location of clamping bolt
* Clamp base cutout height
* Clamp clearance cut width
* Clamp bolt diameter
* Clamp bolt counterbore diameter
* Clamp nut diameter
* Clamp counterbore and nut inset proportions