How to make a spray gun. Homemade miniature spray gun
I decided to share with you the design of my miniature spray gun. It is easy to make such a spray gun literally in one or two evenings.
Homemade spray gun
First of all, you will need a medical syringe with a long needle, from which we carefully grind off the tip and carefully remove the chamfers. Then we remove the ball from the metal rod from the ballpoint pen (this is not a deficit), and shorten the rod itself. The fact is that the rod will have to be put on the needle of the syringe, and the needle should protrude from the writing node of the rod by 0.5 mm. When attaching the rod to the needle of the syringe, the end of the rod must be slightly rolled out (Fig. 1). After preliminary fittings, a hole with a diameter of 3 mm is made in the middle of the already cut rod (in the wall of the housing) and a segment is soldered in this place from the same rod, positioning it at an angle of 45°.
Fig. 1. Homemade spray gun:
1 — needle; 2 — writing node of the ballpoint pen rod; 3 — soldered «nozzle»; 4 — syringe.
As a cylinder for compressed air, I used a metal siphon for soda, anyway, cans for such siphons are not being produced now. I soldered a copper tube into the spout of the siphon, suitable in diameter for a red medical hose, and drilled a hole in the body of the siphon and soldered a nipple from a bicycle. A car pump is best suited for pumping air into the siphon, although all sorts of options are possible here.
Preparation for the work of a homemade spray gun goes like this:
Liquid filtered paint is collected into the syringe without a needle (I used both nitro paints and oil paints) up to about the middle of the volume, then, pushing the piston away, air is also taken into the syringe. Then a needle is put on the syringe, a piece of rod (sprayer) with an attached hose is put on the nozzle of the siphon, into which air is pumped in advance. The spray gun is held with the right hand so that the thumb rests on the piston rod of the syringe. With the left hand, press the lever of the siphon, supplying the necessary amount of air, and at the same time slightly press on the stem of the syringe. To paint small surfaces, it is not necessary to press the rod, since the paint comes out under the influence of the air in the syringe (the syringe in the hand heats up, as a result, the air inside the syringe expands and pushes the paint out).
In order to avoid splashing drops on the product, which usually occurs at the time of the start of air supply to the spray gun, the paint is first directed somewhere to the side, after which, smoothly moving the spray gun, they begin to paint the desired surface.
Then I came across a compressor from a burnt-out refrigerator and I made a blower out of it. I sawed the compressor housing, removed the windings and the rotor, put a pulley from the washing machine on the rotor axis. All this was installed on a wooden frame, secured with a steel tape. I put a handle (3 cm in diameter) from some radio device on the axis of a 50 W electric motor as a pulley and also fixed the electric motor on the frame with a steel tape (Fig. 2).
Fig. 2. My «blower»:
1 — electric motor; 2 — compressor; 3 — steel tape.
For the drive belt, I used a leather belt for a sewing machine. Well, that's it.
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