Ferrite cutting. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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In amateur radio practice, in the manufacture of winding units, it often becomes necessary to cut ferrite magnetic cores, for example, when it is necessary to make a magnetic core of non-standard sizes, cut a ring to perform winding, etc. Ferrite, being a very hard and brittle material, cannot be cut by conventional mechanical methods.
I propose a very simple thermoelectric method for cutting ferrite or, more precisely, breaking it along a predetermined contour. This method was prompted by an article by Odessa radio amateur V. Nikitin "Cutting ferrite products" in Radio, 1991, No. 2, p. 66.
On the surface of the ferrite part, a thin line of the future cut is drawn with a colored pencil. Then, thick white paper is glued on both sides of this line so that the gap between the edges of the paper is 0,7 ... 0,9 mm.
The resulting shallow groove is filled with conductive mastic. For its preparation, one part of aluminum powder (aluminum powder) is added to one (by volume) part of graphite powder and mixed thoroughly. Then nitrocellulose glue, diluted 1:1 by volume with acetone, is gradually added to this mixture and mixed thoroughly to obtain a mass of medium density.
Conductive mastic is applied to the groove of the part with a thin soft brush, after which it is well dried. The mastic dries quickly - on a heating battery in a little more than 30 minutes.
Then one of the two simplest devices is made, the diagrams of which are shown in Fig. 1 and 2. The first of them, proposed by V. Nikitin, is extremely simple, but electrically unsafe. The second differs from the first by the presence of a step-down transformer with an output voltage of 35 ... 40 V. For this, for example, an output personnel transformer TVK-110L2 from old TVs is suitable, in which an alternating voltage of 3 V is removed from terminals 6-35.
Each of the probes is a sewing needle fixed in the body of a ballpoint pen or in a wooden rod. The length of the protruding part of the needle is approximately 15 mm. The wires to the probes must have a cross section of at least 1 mm2.
Having connected the manufactured fixture to a 220 V network, the tips of the probes touch the mastic strip so that the distance between the touch points is 1,5 ... 2 mm. The styli are evenly moved along the groove, maintaining the specified distance between the tips. A mixture of aluminum and graphite, when a current passes through it, is strongly heated, as a result of which a microcrack is formed in the ferrite.
Ferrite rods with a diameter of 6 ... 8 mm usually disintegrate themselves after one bypass along the groove. More massive parts are also easily broken along the contour line, but only after two or three rounds. Irregularities and roughness on the fracture surface are removed with an emery stone.
A ferrite piece can be cut in the manner described in a line of almost any shape.
Author: V.Sychev, Moscow
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