Screwdrivers, no matter how simple they are at first glance, the diversity of different such that simply amazed! The fruits of scientific and technological progress are available in abundance today, the buyer, the market economy makes its case: that neither the manufacturer - the original development. Only here do they know about them, choosing at times on a "screwdriver - it is in Africa, a screwdriver, and why pay extra for it? And then the calluses on their palms, twisted tip, rolled screws, etc. - "epiphany", bought their own money. So what should I look for when choosing this hand tool? Screwdrivers, no matter how simple they are at first glance, the diversity of different such that simply amazed! The fruits of scientific and technological progress are available in abundance today, the buyer, the market economy makes its case: that neither the manufacturer - the original development. Only here do they know about them, choosing at times on a "screwdriver - it is in Africa, a screwdriver, and why pay extra for it? And then the calluses on their palms, twisted tip, rolled screws, etc. - "epiphany", bought their own money. So what should I look for when choosing this hand tool? So, crank Because the handle is in constant contact with the palm of the user, its strengths and weaknesses are determined by two factors - the materials used and the geometry. From the latter depends on how force is transmitted to the screw, the moment and axial force force him to "take its place." The ergonomic shape provides for transmission of high torque band of large radius at the end of the handle with a wide round "neck" with no sharp edges, and closer to the bar - a narrow area ("waist"). It lets you quickly turn the instrument his fingers. In addition, most of the round "models specifically stitch a couple of faces to a screwdriver does not roll off the ramps. "Holes" near the end of the handle - it's holes for suspension (which is easier to store the instrument). About the material. For samples intended to convey a lot of effort, essential close contact with the palm grip and no slip (which can lead to rubbing calluses). To meet these challenges, the plastic casing and ergonomic handles supply rubber inserts. The downside - the chemical resistance of the material, ie the ability to withstand impact without contact with oil, gasoline, solvents or acetone. Most multi handle (with rubber inserts) is intended for use in dry environments, while short-term contact with chemicals for them is not dangerous. But if you know that working conditions will be severe (with a chemical point of view) have to put up with all the plastic handle. Rare, but there are specialized products with lacquered wooden handles, with their range of problems associated mainly with the work of a timber. Since the plastic - the material is soft, not every screwdriver withstand hammer blows. Sometimes, however, it is compulsory (the most common example - prirzhavevshy screw, at least - the use of the tool as a chisel). Readiness to axial impact indicates metal insert on the "top" handle. In these samples the rod goes through, ending up knob, and attacked him on the arm does not affect. Now - about the rod screwdriver It all depends on the metal. Competent manufacturers do not skimp and use high-alloy steel (usually vanadium), which provides a tool longevity. When bad the same material as the product often looks attractive, but can not withstand a month of active work stachivayas and bending. This, incidentally, can also occur with a good steel with hardened bad, so that the firmness - one of the main indicators of the quality of the instrument. No coincidence that it even states the "law". GOST 10754-93 hardness of the working parts should be in the range of HRC 47-52. Shortfall for this indicator face excessive plasticity, abrasion or bending, sorting - fragile and brittle. The main enemy of the metal - corrosion. To protect against the rods are usually chrome plated. Profile of the rod usually round in cross section, though there are models with a hexagon. The synthesis of these solutions - a round rod, about the strong arm hex. With the help of a wrench on the screw easily pass a lot of effort. As to the length of the rods, it varies widely. But all of these variations has one goal - to select the most suitable model. So, there's a screwdriver-"punch" that fit on the palm, and screwdrivers, "dalnoboyschitsy" rod that is several times longer than the arm. For all the difference and they both make it easier approach to the hard to reach places. There are "originals", for example, a screwdriver with a double bend. They each end of the handle moves 90 ° angle with the rod tip (usually they are different). There are also a screwdriver with a flexible shaft, that is, with an inset between the handle and limit switches, allowing to work under bending. And finally - the sting of widely used types of screws are not so many, and for each there is a sting of certain geometry. A good tip should not slip when in contact with the head, so many manufacturers make the sting of rough or even inflict upon him a notch. Many expensive models to improve the link to the tip sprayed a special composition. Some manufacturers use a special hardening technology, in which the hardness exceeds the hardness of the tip of the rod. Do not, however, the black tip to explain a special heat treatment: it is - the result of oxidation (blueing). It is intended to improve corrosion protection in addition to engagement: a rough surface is not moving. Caught on among modern screwdrivers and color indication when the color paint of some elements of the handle says about what it sting. It's easier to select a sample from a set of tools. Handy feature - a magnetized tip. At the market you can even find a device for magnetizing and demagnetizing screwdrivers. Some models have a locking mechanism that keeps the screw on the sting. Many people who are tired of the screwdriver, which disrupted the head, bend and break, really want to have a set of sensible tool. Cute little boxes stuffed with every imaginable and unimaginable "attachments", immediately attracting attention - it is beautiful, diverse and usually inexpensive. But, adhering to our advice, you now can easily be seen beyond the outer tinsel any advantages and disadvantages. Magazine Decoration
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