Installation with a syringe. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Medical disposable syringes used for injections, thanks to the efforts of enthusiasts of technical creativity, began to find further use. For example, in amateur radio practice, in particular, when dismantling radio components from a printed circuit board (especially in hard-to-reach places, where a “third hand” is sometimes lacking). True, the base syringe must be modified (modified) accordingly before this.
The dismantling tool I developed is also based on a syringe: a disposable one, complete with a round nut, a spring, a tip and a hook.
The syringe used is 2 ml, although another one designed for a larger volume is quite acceptable. True, in the latter case, you will have to adjust the dimensions of the round nut, as well as the spring, which in the author's version was taken ready-made - from the plugs of the interrogation harnesses of old telephone switches, where it served to prevent damage to the telephone cord at the sharp break.
However, the spring can also be self-made, wound from a 0,8 mm piano string on a mandrel so that it can easily enter the syringe body (working diameter 9 mm).
The tip is a duralumin sleeve, usually used for fastening lamellar switches. A cut along its side wall is made with a hacksaw blade, followed by finishing to the required size with a flat file. The end of the tip, which is joined to a part of the syringe body, is additionally processed (with an inclination to obtain the necessary taper!) with a drill with a diameter of 4,5-5 mm.
The demount hook blank is part of an old steel bicycle spoke, complete with a bent head that articulates with the wheel hub. The bend and the head are corrected in size on an emery wheel or filed with a needle file. The M2 thread is cut with a lerka, for which the end of the workpiece is first released (heated red-hot in the flame of a gas stove burner and allowed to cool in air), and after cutting it is hardened (re-heated red-hot and cooled sharply, dipped in any oil).
Device for dismantling radio components: 1 - housing; 2 - cross-section rod; 3 - heel; 4 - piston; 5 - round nut; 6 - spring (piano string 0,8 mm or a finished part from the plug of an old telephone switchboard); 7 - tip (modified bushing from lamellar switch); 8- dismantling hook (from the spokes of a bicycle wheel); det. pos. 1 - 4 - from a disposable medical syringe
A round nut is sawn out of St3 steel (you can pick it up from a punch when punching holes). A hole with a diameter of 1,5 mm is pre-drilled, then an M2 thread is cut with a tap. The slots on the nut are sawn through with a diamond-shaped needle file. The nut can also be made of brass or even duralumin. In the latter option, annealing and machining will be required, but subsequent hardening is not needed in any case.
As noted earlier, the dismantling device can also be made on the basis of larger capacity syringes. Quite acceptable, for example, is a Chinese-made disposable 5-ml syringe. The overall dimensions of the device will increase slightly. Of all the necessary "accessories", only the spring and the round nut are subject to mandatory revision, the rest of the parts can remain unchanged. One more condition must be met: the alignment of the tip and body must be observed.
The assembly of the device itself is quite simple and is unlikely to cause difficulties even for beginner radio amateurs. Although a little advice may come in handy for someone: in order to prevent the screwdriver blade from jumping off the slot when screwing the nut inside the syringe body, it is advisable to use a piece of softened chewing gum “for potholder”.
Rules-techniques for using the device are also straightforward. You should hold the syringe between the index and middle fingers directly under the "wings" of the body, and press the heel with the thumb of the same hand. Through the rod and piston, this movement will be transmitted to the nut, articulated with a screw connection with a dismantling hook. The latter will be brought out to the end of the tip, but not beyond it.
With a hook, you need to carefully pick up the dismantled output or the radio component itself. In this case, the pointed end of the hook rests against the surface of the printed circuit board. Now the fingers can be relaxed - the fixture will be held on the printed circuit board by a spring (why not a "third hand"?).
With a soldering iron (in the hand that has just been released), they heat up the place of soldering of the dismantled radio component on the board. Its soldered output or the part itself (depending on what the hook was hooked to) is immediately released by the expanding spring.
Author: N.Ivashin
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