Child joy. The spinning top is one of the favorite toys of kids. Some designs allow you to exhibit astonishing physical effects. The following illustrations show three of the top. The first of them is horizontal, it can be in two variants. Option And unwinds the palm of the hand, and the second (B) — thread (Fig.1); in both cases, the disk begins to rotate around the vertical axis. If the plane is to glue strips of colored paper, respectively, during rotation of the gyroscope can be observed, for example like colorful stripes “disappear” and the paper appears white, and black-and-white figures are converted into colored rings.
The second gyroscope is vertical, with two disk blocks on the horizontal axis (Fig. 2). It is suspended to the handle and rotates after the twist of the thread, falling, by inertia climbing up again.
For horizontal top (Fig. 1) required: three-layer plywood, harsh thread, bobbin of under thread, a wooden rod with a diameter of 6 mm, drawing paper, a bar of dimensions 160x20x20 mm.
Fig. 1. Horizontal top (A — manual option B — table):
1 — double sided disc; 2 — rod; 3 — handle; 4, 5 — part reel; 6 — strand
Tool: ruler, hacksaw, drill 2 mm diameter, a drill, sandpaper or file.
1. To cut from plywood disc with a diameter of 90 mm.
2. To cut sewing the coil into two parts so that one of them was in the form of a disc (top), and the other of the rim to the hub (bottom).
3. Cut off from the stem part length 100 mm, sharpened on a cone one end. For desktop option to drill under the thread hole with a diameter of 2 mm at a distance of 25 mm.
4. Cut paper two annular disk, to paint them as shown, and glue on a plywood disc with two sides.