This project is a little cooling fan that I made for my 2”x72” belt grinder. It runs off the rear shaft of the treadmill motor that is the muscle behind the grinder. It forces cool air through the rear of the motor to flywheel at the front (where the contact/drive pulley sits). The blade pitch is 45 degrees (five blades in all), and is about 3” in diameter. I made a custom hub to attach it to the drive shaft, and I plasma cut the fan blade itself. I designed the fan blade in AutoCAD, and imported it to the plasma cam software. It’s pretty cool having fun tools to fix equipment with!