Stencil improvement. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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To draw a drawing of conductors on a printed circuit board blank, many people use home-made stencils made of sheet organic glass 3 ... 4 mm thick. Such stencils greatly facilitate and speed up the process of manufacturing the board, but they also have their drawbacks.
If you mark future contact pads on the foil with a pencil, then due to the partial shedding of the stylus by the end of the work, the drawing looks dirty due to the shift of the stencil. And when you start working with paint or ink, at the moment you raise the stencil to set it in a new position, the newly drawn circle is often smeared.
To eliminate these shortcomings, it is enough to make a bevel with a file on one of the edges of the stencil (if it is made in the form of a ruler, then on one of its ends) from the side adjacent to the board, as shown in the figure.
After applying the next circle to the foil, it is enough to press the beveled shank (shown by the arrow in the figure) - the stencil will rise and it will be convenient to move it to a new position.
The underside of the stencil should be roughened with coarse sandpaper or strips of sticky PVC tape should be applied to reduce its slippage during patterning.
Author: S. Kasinsky, Ulyanovsk
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