Picture of Making a gear box for a wind turbine
Instructables how to turn a drill bit into a gear box for a wind turbine

For this i used:
- Block of nylon
- hand held drill 

- Lathe
- Vernier caliper (slide gauge)
- CNC milling machine (depend son drill could just use a lathe) 

Step 1:

Picture of
Use a Vernier caliper (slide gauge) to measure the dimensions of the gears, chuck, motor and other components

The dimensions I got for mine are show