A simple way to make a scale of homemade pointer instruments. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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During the manufacture of one of my devices, as always, I stumbled over the scale (it’s disgusting to do poorly, it’s very troublesome to do it professionally and efficiently). The device was not intended for the exhibition and it was not required to direct any special prettiness. And it was required as quickly as possible, without hassle, as long as possible. I found a solution that was ridiculously simple and for a long time wondered why I had not thought of it before.

We take food-grade aluminum foil (we bake the chicken in it), obviously larger, stick double-sided tape (which is thin) on it. It is reasonable to cut one of the edges along the ruler. We seal the desired section of the scale with this foil, with the cut edge to the axis of the measuring mechanism. If you haven’t done this before, I advise you to practice on an extraneous piece, since a good adhesive tape immediately sticks tightly, and you still need to bring it under the arrow. If the scale is easily removed, then it is better to do it. I am not writing these lines to intimidate. I did it like that. No mistakes, no trials. But, if the scale is large, and the gap under the arrow is small, it will be easier. Yes, and the risk of demolishing the arrow is less. If you have a choice, it is better to take a thicker foil.

Cut off the excess along the contour. It is convenient to do this with a clerical knife with "sawing" movements, pressing in such a way as to press the foil against the scale.

The base is ready. We begin the calibration of the device.

We submit the calibration values ​​​​and with the tip of the needle we put marks on the scale opposite the arrow. I did it under a magnifying glass. If you make several attempts to average, then put barely noticeable dots, and then push the mark. I advise you to immediately write down on paper what mark you made, there will be fewer mistakes (risks can be confused).

Having put down the necessary marks, we impose a ruler so as to cross the axis of rotation of the frame and the desired point, with the tip of the needle we push the risk of the desired length. You can get by with a dot for intermediate values. If the needle is too sharp, dull the tip slightly. And so on, until all the marks are applied. If desired, you can push through the line with a compass, resting one of the needles on the central screw of the mechanism.

We push the necessary inscriptions and, in principle, that's all.

Believe me, the scale is quite distinguishable, but if you want to make it more contrast, paint over the risks directly on top with a dark permanent marker and almost immediately erase the excess with a dry cotton swab with movements transverse to the risks. Keep in mind that the marker will fade over time. In Fig. 1 part of the scale is shaded.

On fig. 2 you can understand how the scales look at different angles.

In addition to simplicity and speed, this method of manufacturing a scale, along the way, alleviates the problem of statics and the arrow will no longer "stick" tightly in an arbitrary place on the scale.

Like any medal, there is a downside. In case of an error, it will not be easy to separate the adhesive tape from the native scale. You will need to remove the scale from the measuring mechanism. It will not be possible to make inscriptions not by hand. Or combine the scale with a separate label with inscriptions. But I wouldn't.

It is better to fix the needle in something for convenience. I have it inserted into the stem from the old syringe and clamped through the PVC tube with a cone head from the cooker. This is one of my most used tools.

On time, together with graduation, I kept within an hour! True, the scale is small and simple. I have never made scales faster and easier, if not to talk about hand-drawn on paper. If the adhesive tape is of high quality, then the scale is eternal. In the pictures, the foil is not very even, this is due to the fact that I found only a crumpled residue at home, I was too lazy to run for a new one, I had to level it.

Yes, this method does not replace the "professional" methods, but in some cases it makes life much easier. And the fight against static sticking.

Author: Trishin A.O., Komsomolsk-on-Amur; Publication: cxem.net

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