Grinding nozzle for a drill

A complex, but very cool homemade drill is based on the transformation of rotational motion into reciprocating. The device is located in a metal frame, the size of all moving parts is well calculated.

The drill rotates a makeshift nozzle with an edge cut at an angle, the rod with a bearing at the end abuts against it. Return movements are provided by the spring pressing a rod to a nozzle.

At the outer end of the stem is a platform on which you can mount sandpaper of different gradations. The advantages of this device in a compact size and the ability to use different drills.