If you want to cut a round hole in the plywood or other rigid sheet material, but no jigsaw or handsaw pointed, easy to assemble witty prisposoblenie that will replace these tools. Only need two metal cores, one of which is pointed, the other sharpened like a cutting torch. Clamped in the vise at the required distance from each other, the first rod will serve as the axis on which will be pressed to rotate the plywood on top, and the second is from the bottom to cut the necessary hole.
Recommend to read
AST WATER HEATING IN THE SAUNA
To obtain hot water in a bathhouse, a tank-register on the stove pipe (or a boiler in the stove itself) and an external tank in the washroom are often used. Water circulation between them...
LED BY THE SUN
It would seem that there is nothing complicated in the design of a bicycle driven by the energy of the sun: install a solar battery of the required capacity and a simple electric motor -...
