When drawing a circle or an arc on a drawing with a compass at a certain ratio, usually the light compass is used to measure the required size on a certain scale, and then the corresponding circle or arc is drawn on the drawing. It must be measured first and it is more troublesome. This paper introduces a compass that can be drawn directly proportionally, which can improve the work efficiency by more than 1 time and is not easy to make mistakes. The scale compass is composed of ordinary compasses 1, positioning pins 2, 3 and special scale 4 (can be modified by 150mm steel ruler) as shown in the figure. Simple structure. Easy to manufacture and use.
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