Universal mini drill. Drawing, description

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Universal mini drill. home workshop

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For many operations performed in training workshops and technical circles, a portable universal tool such as a dental drill would be very convenient. However, it is almost impossible to acquire one, and, as always in such cases, the question arises: is it possible to make something similar on your own?

The main scarce part of the device is a flexible shaft. But after all, the flexible shaft of the speedometer of a car or motorcycle works almost on the same principle - and this decommissioned part is already easier to get.

I used a cable from some truck: it turned out to be more suitable for attaching both to the motor and to the working head.

Universal Mini Drill

Structurally, the mini-drill has developed from three parts: a motor, a flexible shaft and a working head with a standard three-jaw chuck from a drill, with a shortened Morse taper. As a drive, I used an electric motor of the DKS-1 type with a power of 35 W for a voltage of 220 V. Any other motor with a power of up to 60 W and a speed of 2700 - 5000 rpm can also be used.

The designs of the working head are simple and can be seen from the figure. Ome is assembled in this sequence. A ball bearing No. 18 is pressed onto the shaft until it stops, after which, together with the shaft, it is inserted into the groove of the housing, a spacer sleeve is put on and a second similar bearing is pressed into it until it stops. Before assembly, both bearings are thoroughly washed in kerosene, and after pressing, they are lubricated with grease or technical petroleum jelly. The shaft should rotate easily, without jamming, in the housing. After making sure of this, screw the front and rear covers of the case. Then the end of the cable is inserted into the shaft and the union nut of the flexible shaft is screwed on.

Scheme of a mini-drill and tools for it (click to enlarge): 1 - cartridge (No. 1A), 2 - front cover, 3 - ring (D16T), 4 - working head housing (D16T), 5 - tube, 6 - shaft (Art. 45), 7 - ball bearing, 8 - back cover (D16T), 9 - ring (D16T), 10 - flexible shaft, 11 - adapter sleeve (D16T), 12 - corner (D16T), 13 - base (textolite B 10 mm), 14 - electric motor, 15 - rear corner. A - cutter assembly and holder scheme, B - polishing head and its holder

The engine is installed on the base in the following order. On a board of suitable size or a thick textolite plate, two corners are fixed with M4x10 screws, and an electric motor between them. An adapter sleeve and an engine are attached to the right corner with M5X12 screws; the ends of the studs connecting the front and rear covers of the motor are inserted into the left. Then the second end of the flexible shaft cable is connected, and its union nut is screwed onto the adapter sleeve. On the base of the motor, it is also possible to place a capacitor in a casing and a switch. As the legs of the base, you can use rubber corks from medical vials.

To work with a mini-drill, you can also make a microtool. It can also be ready-made dental burs, grinding discs, drills with a diameter of up to 6 mm. For home-made ones, it is enough to make a holder-base, and the working part can be interchangeable: milling cutters, emery stones, circular saws. They are put together with washers on the holder and secured with nuts. To work with disc cutters and saws, the working head must be fixed permanently, for example, using inserts and a table vise. It is better to make a special table With an appropriate mount for the working head.

Using a mini-drill, it is convenient to drill holes in plastics and metals, sharpen cutting tools, polish parts, mill complex surfaces, engrave, cut sheet material, and perform many operations.

Author: A.Ashaev

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