Thickness gauge modeller. Drawing, description

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Thickness gauge modeller. Tips for a modeler

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How and how to measure the thickness of an aircraft model wing with an aerodynamic profile, or the thickness of a propeller in different parts of its surface? The caliper is not suitable, because it has too short jaws. And making templates for each model is a laborious task.

In such cases, a thickness gauge will help out. We think it will become an indispensable tool for any aviation or ship laboratory or a circle of young technicians. By the way, it was invented by the famous violin maker A. Stradivari in order to be able to accurately produce the soundboard of the violin.

The tool that we offer differs from the one invented by Stradivari only in appearance. The principle of operation is the same.

Modeler's Thickness Gauge
Thickness gauge device: 1 - case, 2 - trigger, 3 - ruler, 4 - arrow, 5 - steel wire spring, 6 and 8 - fixed axles, 7 - movable axle

Now look at the drawing. The body of the instrument only looks so complicated. The easiest way to make it from a sheet of plywood. True, you will have to cut out two identical blanks with a thickness of 10 mm. Transfer its contours from the drawing to graph paper in full size (cell size 10x10 mm), then use carbon paper on plywood and cut out blanks. Now glue them together. When the glue dries, carefully finish the edges with a rasp and sandpaper. From plywood 3 mm thick, cut the trigger.

Next, mark all holes according to the figure. Drill them. Paint the finished parts with two layers of oil varnish.

Two axes must be inserted into the jaws of the tool. They can serve as two steel rods with a diameter of 6 mm, one axis is fixed. On glue, it is pressed into the lower sponge. A movable axle is inserted into the top. It is spring-loaded with a flat spring, thanks to which it does not fall out of the hole. A groove and a hole are provided at the upper end of the movable axle. An arrow is inserted into the groove and fixed with a screw. She has the ability to swing. For these purposes, another fixed axle is provided. On glue, it is planted in the upper lip.

A ruler is provided for reading the readings on the body of the device. It needs to be graded. How to do this is easy to guess. Place a plate under the jaws, the thickness of which is accurately measured. Marking the position of the arrow on the ruler, draw a line with a sharp scriber. Repeat the same operation with the next plate. It is desirable that their set fit in the thickness range from 1 to 10 mm.

Pay attention to the pull - a piece of fishing line with a diameter of 0,6 mm. At one end it is tied to the arrow, the other - to the trigger. One has only to pull the trigger, the arrow drops and raises the movable axle. It remains to bring the part into the gap, the thickness of which must be measured, and release the trigger. The lips will close. And the arrow will accurately indicate the thickness of the part in this place.

Author: A. Alekseev

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