Razor drills. Drawing, description

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Razor drills. home workshop

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Radio amateurs often have to drill a large number of small diameter holes in circuit boards. It is not very convenient to do this with serial drills - the dimensions are too large. And a thin drill is not so easy to clamp in a large cartridge.

I got out of the situation as follows: I made myself a micro-electric drill out of ... the Kharkiv-15 electric razor that had fallen into disrepair (other modifications of this brand, as well as Agidel, will do). I installed a homemade removable drilling head instead of knives.

The head is a single-stage gearbox with two parallel shafts, on which gears with a number of teeth of 14 and 39 are mounted (from electric shavers of the first releases). The primary shaft is connected to the electric motor, and the secondary shaft is connected to factory-made cartridge No. 1.

The body of the head is machined from duralumin; it is attached to the electric razor with a M22X1 threaded mounting flange and a homemade lock nut and is closed with a lid on two M3 countersunk screws. The side mounting cutout in the housing (bearings and the output shaft gear are fed into it during assembly) is masked by a clip fixed on the housing with one M3 screw. The holder has a mesh knurling, which helps to screw the drill head into the M22x1 thread.

Micro electric drill design (click to enlarge): 1 - electric razor, 2 - drill head body, 3 - M22X1 locknut, 4 - pin Ø 0,8X8 mm, 5 - clip, 6 - M3 screw, 7 - pin Ø 0,8X5 mm, 8 - small gear, 9 - input shaft, 10 - cover, 11 - bearing No. 1000083 (2 pcs.), 12 - cartridge No. 1, 13 - secondary shaft, 14 - bearing No. 24 (2 pcs.), 15 - large gear, 16 - pin Ø 1X7 mm, 17 - thrust ring of a self-made bearing, 18 - separator, 19 - ball Ø 2 mm (6 pcs.), 20 - support ring.

The primary shaft, machined from steel 45 (St40X can be used), rotates in two radial bearings No. 1000083, the secondary (made of the same material) - in three bearings, two of which are No. 24, one (thrust) self-made.

For those who wish to make themselves the same microelectric drill, I advise you to somewhat simplify the design. For example, a pair of output shaft bearings (No. 24 and self-made), if possible, replace with one angular contact of a suitable size; combine the clip and the cover into one part, then there will be no need for a seat for the cover, as well as for the side mounting screw.

The duration of continuous operation of "Kharkov-15" or "Agidel" (until strong heating) is about 12 minutes. During this time, I was able to drill 210 holes Ø 1 mm in a glass-textolite board 1,8 mm thick.

Author: V.Kovalev

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