When processing large surfaces of metal or wood, each master uses to fasten sandpaper to any device. One of the simplest: a piece of wood, girded with a rubber ring This method is convenient because it allows you to quickly change the exhaust a strip of abrasive material by a new one.
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What does a person do when solid food is "too hard"? Goes on soft! Here also it is necessary to do with an old or broken drill bit for metal. Sharpen its end, as shown in the figure, and...
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The end of the Second world war and the beginning of the war "cold" put shipbuilders leading countries of the world in a very difficult situation. What will be the fleet of the near...
