Reverse for drill. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Somehow the author wanted to convert the old drill he had inherited into a screwdriver. To do this, it was necessary to do two things: reversing the rotation and adjusting the speed of the drill. Here's how the first one was done.
Previously, the switch in the form of a pistol button was located in the gap between the cord of the XP1 plug and the excitation winding of the OB, but by the time of the repair it was irretrievably lost. In addition, it was necessary to separately install a toggle switch for the direction of rotation, for which there was no space. Therefore, the switch and the direction switch were made as two microswitches installed instead of the switch button (see figure).
To do this, the wires from the excitation windings to the brushes must be broken and connected to the switches. Instead of two switches, you can use one three-position (with one set of contacts reversing), but always with an automatic return to the middle position.
Now, when you press one of the buttons, the drill rotates in one of the directions, and when you press two or release it, it stops.
Disadvantages: when the buttons are released, shock braking occurs accidentally due to sparking in the switches; even when switched off, the drill is under dangerous voltage.
Author: A.P. Voropay
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