A master homebrew, working with metal, have in their Arsenal, angle grinder, called colloquially the “grinder” (the name originated in the old “stagnant” times, due to the fact that this power in the USSR were exclusively Bulgarian production). The undoubted positive qualities (high performance, ease of use, versatility, etc.) have angular shlifmashiny quickly wear out and even break the teeth of bevel gear pairs. To acquire the right set of gears and to sort out the gearbox — no problem. However, this does not relieve further from repeated repairs. It’s all about the grease, or rather in its failure. In the process of thick grease under the action of centrifugal forces distributed over the walls of the casing, divided into sectors by ribs, and thus out of business.
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Blades from the safety razor is often used as a kind of microcycle. But keep them in the hands uncomfortable and unsafe. Holder, shown in the figure, will significantly simplify the business. The handle can be made of aluminum tube with a diameter of about 12 mm. One of its ends flattened and bent at a comfortable work angle. It bent the end of prikladyvaya steel plate, which split three threaded holes M3. Wrapped in two outer screws, and their heads serve as guides when installing the blade.
Many probably had to watch as the metal is heated during processing it on an emery wheel. The phenomenon is harmful: heating “releases” hardened metal. Is it possible to turn it to their advantage? Well, for example, to cut metal? For the experimental verification of the idea took only an hour and a half I’ve ground off the teeth from an old circular saw blade and secured the tool (smooth disc) is grinding in elektrotochilo.
The lamp has only three pipe parts: the bracket, the clip and the visor. The first two (see picture) made of steel sheet with a thickness of 1-1,5 mm (dotted line marked bend line). The visor is cut from galvanized roofing iron.
“From work saw burn until white!” — wrote Vladimir Mayakovsky in his poem “Whom to be?” Meanwhile, heat the cutting tool in the first place means that he is dull. In this case, the joiner, as of old, takes padpilot (triangular file — in modern terminology) and manually sharpening the teeth of a handsaw. Much hard work and unproductive work! But maybe, and this operation can be mechanized? There are also sharpening machines for milling cutters, disks of circular saws… However, here’s a review on the machine, developed by ninth-graders of high school № 28 of Ust-Kamenogorsk city under the leadership of teacher A. A. Boytsov: “bench grinder will find wide application not only in school workshops, but in the joiner shops of the construction companies and carpentry teams on any construction site. The machine is easy to manufacture and allows you to sharpen the various woodworking tools — hand saws, the blade semi-circular and chain saws”.
The knives or Strug indispensable when machining curved surfaces. To make them simply — it will only have an old file with a length of about 200 mm. In the first file you need to termoobrabotki. Soshlifovat previously a small area, gradually heat the file evenly along its length until, while in ground place appears red-brown film of oxides, after which the file is cooled in water or air. This heat treatment will reduce the brittleness of steel, while maintaining the hardness necessary for cutting edge on plow.
The principle of operation of this device for cutting, or rather, cutting out of teeth on the blades for the hacksaw is simple. Its main part is a wheel with a cage, fortified it with four screws. On the surface of the cage is cut two or three strands of outer thread with a pitch, height and profile of the future teeth of a saw. Extreme thread thread partly removed with a cutter, or a chisel and chopped off the right angle: the end will perform the role of a punch. To increase the impact force to the flywheel attached two opposed.
In the journal “modelist-Konstruktor” No. 4 for 2008 have already been published, one of my small bench drill press. Now offers readers a different, in my opinion, a more versatile and interesting design. Meanwhile, this upright drilling machines single-spindle work hard also not hard to make yourself, having practical skills in machining metal parts and metal build, and some of the most complex parts can be ordered as a master-technician.
Present Board milling machine come in handy craftsmen who love to work with wood to get the blanks embossed surfaces, various geometric patterns, as well as cutting slots, grooves, sockets (both simple and shaped), etc. the Machine consists of two main parts: a base attached to it the guide posts and spring-loaded platform on which is mounted an electric motor.