Material: Cedar wood can be used if conditions permit, because its natural fragrance can drive away insects and does not produce fungi. Of course, you can also choose other wood. The key is to be durable and stand the wind and rain. These woods can be bought in large timber markets in the city.
Tools: common woodworking tools, good wood glue and several long screws.
In order to make you more aware of the production process, I will first provide you with a basic production idea: fix a brace every 40 cm on a piece of wood similar to a girder, one *** 10, which runs through the girder like a rib; The "ribs" are fitted with seven horizontal bars, which are parallel to the girders.
In order to make the brace fit firmly with the girder, we use a semi-wrapped joint, dig a 3 cm deep V-shaped groove on the girder with a saw, and smooth its surface with a plane or chisel.
In order to match the bracket with the V-shaped groove, the width can be traced on the base first.
During installation, a layer of woodworking glue is thinly coated in the groove to fit the bracket in. The practice of two small launch vehicles.
0 0 material: plastic straws 1 root, cardboard, plasticine, small springs 1 root, steel cans 1 root, bicycle steel wire, a 100×50(mm) board and 2 small nails.
Production method:
0 1. Cut a 20× 100(mm) steel sheet from the can, and drill Ф 3 mm holes at both ends according to the figure.
0 2. Insert the steel wire of the door crane on the board, insert the thin steel sheet and spring according to Figure 2, and then fix one end of the steel sheet on the board with nails to make the launcher.
0.3. Cut four wings with cardboard and fix them at the lower end of the plastic straw, so that the bottom forms a cross. Finally, the plasticine is inserted at the top of the plastic straw to make a rocket.
0 play: put the rocket on the wire of the launcher, press the spring steel under the skin with your hand, and then let it go, and the small rocket will automatically pop up. Pay attention to safety and run under the supervision of parents, children.
Paper flowers for forecasting the weather
Materials: pink colored paper, disposable paper cups, straws, decorations, salt water, newspapers.
Making process: cut the pink paper into petals, coat them with salt water, dry them, stick them on one end of the straw to make flowers, put them in the center of the paper cup by hand, and stuff newspapers on both sides to make soil (add water to the newspaper and press it) and decorate them.
"The petals are thick, and soon it will be wet or rainy. When it is light, it will be sunny.