A homemade tool sits perfectly in the hand, has small dimensions and light weight, so it can be very used when drilling various small parts. A comfortable grip allows you to better control the drilling process than when working with a conventional drill. Another advantage of this homemade product is its noiselessness.
The "heart" of a mini-drill is a brushless motor from an old hard drive. For power supply, you can use any PSU that produces 12 volts at a current of up to 2 A. The maximum threshold for power consumption is not more than 15 watts. The speed control is brought out from below, and the handle itself is made of layers of textolite and getinaks glued together.
Design Features of Mini Drill
The motor from the hard drive has a large mounting flange, which must be cut as much as possible to make the case more compact. The holder for the motor is made of a piece of aluminum billet, in which a "landing seat" for the engine is bored on a lathe. An 8 mm groove is made on the back of the holder.
The handle of a mini-drill is made of pieces of getinax of different thicknesses: in the center - 8 mm, and on the sides - 4 mm. Before gluing in the plates, you need to make a rectangular "window" to install the engine control chip. On the edges of the handle are glued textolite overlays with a thickness of 2 mm.
The holder with a motor is attached to the upper part of the handle for glue, and is also additionally fixed with two M3 screws. Also on the lathe, you need to grind an adapter with holes for attaching a mini drill to the chuck. When all the parts are ready, you can start assembling the tool. See the detailed assembly process in the video on the site.
