The simple, functional design of the drill, presented by the author of the video, is quite capable of competing with a professional instrument. The characteristics are almost the same, and one of the advantages is the complete autonomy of the tool due to built-in batteries. Well, and of course, a low price, because a professional drill will cost much more than our homemade one.
With its help you can drill almost any materials: wood, plywood, fiberboard, MDF, plastics, composites and even soft metals (for hard ones it will be rather weak). It can be used to sharpen cutting tools, trim, engrave, grind, in general, everything that is usually done with a drill. How to make it? Let's get a look.
How it works?
The basis of the device is a 12 V brushless DC motor. Its body has a regular cylindrical shape, matching in diameter with the internal size of a 2-inch PVC pipe for sewer work. The engine is powered by two lithium polymer battery at 2200 mA, total voltage - 7.4 V.
Collecting materials and tools
The materials we will need are:
- 12V DC motor;
- Collet chuck for drills, working diameter – 3 mm;
- A 32 mm section of PVC sewer pipe;
- Two lithium polymer batteries;
- Switch button;
- A little plexiglass for pipe plugs;
- Several copper wires with solder, sandpaper.
Tools: soldering iron, hacksaw, screwdriver, milling cutter for drilling outer circles, screwdriver, paint knife, electrical tape and superglue. For marking we will need a tape measure and a pencil.
Making a drill - step-by-step master class
Engine and collet chuck
The DC motor for our drill is really very cheap. On Aliexpress it can be found for only 300 rubles. Meanwhile, it consumes 1.4 A, which means its power will be equal to 16.8 W. This is quite enough for such equipment, considering that the engine can accelerate to 23,000 rpm.
The motor shaft has a diameter of 3 mm, and it is necessary to select a collet chuck for it. It is secured to the shaft using a hexagon screw. The collet is clamped using an open-end wrench and a stopper of the chuck itself.
PVC pipe
Using a regular metal blade or a hacksaw, cut a 15 cm long piece from the PVC pipe. Clean the edges with sandpaper to remove burrs. The motor housing must fit tightly into the pipe.If gaps remain, they must be eliminated using spacers, for example, from a rubber bicycle inner tube.
End caps
We make end caps from a piece of plexiglass, plexiglass or fiberglass. The author used a cutter attachment to drill out the outer circles. They can also be cut out with a simple hacksaw, adjusted to size and sanded down the edges.
In the center of both plugs there should be holes for a collet chuck and a connector for charging batteries. The circle of the plugs should overlap the PVC pipe.
Engine installation
We expand the hole for the cartridge to the required diameter with a round file or needle file. We attach the engine to one of the plugs, making holes to secure it with screws. They can be made with a small drill and a screwdriver. We attach the plugs with superglue for plastic.
Batteries
You can get sufficient voltage using two lithium-polymer batteries. Batteries from an old laptop will do.
We connect them in series and wrap them with electrical tape. We bring contacts from insulated copper wire to the engine through a switch button.
Putting the elements together
First, we connect the engine, solder the wiring and insulate the contact group with heat shrink. We fix the motor with the collet chuck on the cover, and mount the switch button on the side of the body using glue, making a hole for it and leveling it with a file. The connected batteries must fit perfectly into the size of the PVC tube.
The assembly is completed by a 5.5 mm jack for charging batteries. We attach it to the back cover using a clamping nut. We solder the contacts from the batteries to the connector, insulating them with heat-shrinkable casings.The joints of the plugs and the tube can be additionally covered with superglue and cleaned with sandpaper.
Bringing beauty
To emphasize individuality, the author chose to decorate his instrument with an exclusive inscription. Making a makeshift stencil out of film and cut-out letters, he used spray paint to give his creation a unique finish.
The drill is ready, now you can carry out experimental tests and try to drill or cut something. Rest assured, in capable hands such a tool will never sit idle!
