The Spindle

The spindle is the axis which is connected to the chuck and is driven through the pulley. The pulley is connected to the spindle through an axis with slots for the torque transmission.

The quill is assembled over the spindle, connected through bearings. Bearings Bearings: 6203Z 17x40x12 (Single Shielded) Ball Bearings; because they can handle radial and axial force. Most the bearings need to handle radial forces caused by the movement of the chuck.  Material spindle and quill: Steel The spindle, and therefor the drill, can move up and down if the user moves the operating leverages. The leverage is connected to an rack and pinion and a flat torsion spring. the rack and pinion converts a rotation into a translation. The flat torsion spring makes sure when the leverages are not in the hands of the user, that the drill returns to it's original position (to avoid accidents).  Calculations to determine the gear inside the body of the machine.