How to make a simple machine for sharpening knives with their hands - instruction

The problem of knives, especially the kitchen, we are confronted almost daily.Not for nothing on the market a huge range of different devices (the demand is high), which can be electrical or mechanical, expensive and cheap, for every taste and budget - from 850 to 86 000 rubles ( "sharpener" machines, Musatov).

Yet experts recommend sharpening knives by hand with the help of sticks.Professionals use them to 4 - 5, as this process has its own nuances.But it is this edge treatment provides not only the sharpness, but also long-term operation without additional sharpening.In addition, not the fact that the purchase of the most expensive, "tricked" products guarantee high quality of work.After the experience with the "winepress," as it is known, can not buy in the store.

Since most of us to "pro" category in this case does not apply, it is advisable to make a simple (same) fixtures at 2 bar (grinding + polishing).Time required bit, and the benefits of them will be large, since the method used in the home "iron stone", which adheres to the hand, rarely gives the desired effect.Especially since most of it is short-lived, and again all over again.

manufacturing technology

Who Tutor sharpening blades on e / winepress (motor + circle), knows how difficult it is to sustain the correct angle, especially if abrasive, except that it is rotated, also "leads" from side to side.And these beats can even be the equipment manufactured by industrial methods (as the establishment of a resource).not to mention the machine, manufactured by hand.In addition, the metal itself, is constantly exposed to thermal stresses (and sometimes banal overheating), eventually becomes softer, which reduces the service life of the knife.

much easier to work if the grindstone (bar) is fixed at a certain position.Will only "drive" the blade up and down, keeping the desired angle.On the Internet there are a variety of home-made, with both advantages and certain disadvantages, but the proposed design is simple and not time-consuming to produce and even more investments.It looks like this.

As can be seen from the figures, just need to pick up the pieces of wood, glue of them (or fasten hardware) a couple of angles and drill the holes for the screws with clamping nuts.Such a device is versatile, since sharpening angle exhibiting any.It is enough to weaken the "ties" and change the slope of the abrasive bar, and then lock it again.

remains the main question - how to calculate the best angle?This is easy to do, if you remember the basics of trigonometry (in the picture).What is a tangent, they know everything.A calculator for engineering calculations are in any operating system on your computer.

Although you can use an ordinary school protractor, which need only be applied to the horizontal "foot" devices.

Features sharpening ceramic knives are described in detail here.What

consider

• each blade, depending on the destination and the blade material, requires a different angle sharpening.The smaller, the sharper the cutting face, but also decreases its strength, especially if the knife is used for cutting materials or solids.Consequently, it will have to sharpen more often.For the majority of kitchen knives is optimal angle of 15 - 250.
• whetstone, commercially available, are not the same, and therefore have in stock need at least 2 - 3 different, because each knife is needed to determine their type.How to choose the right abrasive - a topic for another conversation.