Cuts friction. Drawing, description

HOME WORKSHOP
Free library / Directory / Home Workshop

Cuts friction. home workshop

Home Workshop

Many probably had to watch how the metal heats up when it is processed on an emery wheel. This phenomenon is harmful: heating "releases" the hardened metal. Can't you turn it to your advantage? Well, for example, to cut metal? It took only an hour and a half to experimentally test the idea. I ground the teeth off an old circular saw blade and fixed the resulting tool (an absolutely smooth disc) instead of an emery wheel in an electric grinder.

The "start" button is pressed, the disk spins. I brought a steel corner to it. So he touched the disk, there was a creak, a squeal, after a few seconds the workpiece warmed up at the point of contact with the disk, a luminous dark red dot appeared there, it brightened, turned orange, and then I felt that the disk crashes into metal. Passed the first millimeter, the second, the fifth ... Sawing! Sawing absolutely smooth disc! The scrap bounced off with a clatter, and I stopped the electric motor. I wonder if the disk is very hot? I touched it with my hand: the disk turned out to be slightly warm, well, maybe a little warmer than the air in the room.

But what if you try to cut other materials? Everything that was at hand was used: aluminum and glass, ebonite and getinax, wood and a piece of file that turned up - everything was subject to my disk. Glass was especially interesting to cut: it quickly heated up red-hot at the point of contact, melted, and only after that it cut through. Hardened steel (a piece of a file!) Was cut rather hard, and as for aluminum, it turned out to be easy and simple to process it in this way.

Having finished the experiments, I tried to comprehend the discovered phenomenon. What is my instrument? Yes, obviously, the same circular saw, but with a huge number of vanishingly small teeth. True, it works a little differently: its main task is to heat the metal at the point of contact, thereby bringing it to a plastic state and squeezing out the semi-molten "dough" from the cut groove.

Interestingly, during operation, the diameter of the disk does not decrease; it would seem that it should be ground off, this, apparently, is actually happening, but at the same time the reverse process is going on - sticking of molten metal to the working tool, in some cutting modes the diameter even begins to increase.

A little about the design of the machine with a cutting disc and its operation. The easiest way to form a disc is to fix the saw in place of the emery stone and (with the grinder motor turned on) carefully bring a coarse-grained bar close to the teeth.

Cuts friction
Scheme of fastening the cutting disc to the electric motor: 1 - electric motor, 2 - mounting flange, 3 - cutting disc, 4 - screw, 5 - nut, 6 - handpiece, 7 - material being cut

You should pay attention to the radial runout of the disc: try to keep them as small as possible, otherwise cutting will be much more difficult. This is especially noticeable when cutting glass, which then cracks. Axial beats, on the other hand, contribute to a cleaner cut: the fact is that they play the role of set teeth in a circular saw. I tried to fix the disk in the chuck of the lathe, it worked in the same way as on the grinder.

Generally speaking, the efficiency of a cutting disc increases with an increase in peripheral speed. Unfortunately, circumstances did not allow me to test it in operation with a high-speed engine. But, apparently, this should increase the cutting speed and improve the surface finish.

The disadvantages include a relatively large clamping force (especially at the first moment, when the metal has not yet warmed up) of the workpiece to the disk, however, as the metal warms up, it decreases several times.

Author: O.Lavrov

We recommend interesting articles Section Home Workshop:

▪ Planer blade sharpening

▪ sliding window

▪ Three-operation table machine

See other articles Section Home Workshop.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Alcohol content of warm beer 07.05.2024

Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>

Major risk factor for gambling addiction 07.05.2024

Computer games are becoming an increasingly popular form of entertainment among teenagers, but the associated risk of gaming addiction remains a significant problem. American scientists conducted a study to determine the main factors contributing to this addiction and offer recommendations for its prevention. Over the course of six years, 385 teenagers were followed to find out what factors may predispose them to gambling addiction. The results showed that 90% of study participants were not at risk of addiction, while 10% became gambling addicts. It turned out that the key factor in the onset of gambling addiction is a low level of prosocial behavior. Teenagers with a low level of prosocial behavior do not show interest in the help and support of others, which can lead to a loss of contact with the real world and a deepening dependence on virtual reality offered by computer games. Based on these results, scientists ... >>

Traffic noise delays the growth of chicks 06.05.2024

The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>

Random news from the Archive

Saving apples from sunburn 10.08.2021

Washington State University researchers are testing a high-tech approach to preventing apple scorch in the face of global warming.

The summer sun helps the apples ripen and get their classic red color, but the heat often causes the fruit to scorch. While the leaves of the apple tree are able to absorb sunlight, the fruit also does not dissipate heat. Sunburn occurs in as little as 10 minutes, causing irregularities that detract from the quality and appearance of fruit, such as ugly brown spots.

Most apple growers in the US use sprinklers to cool the canopy of orchards on hot days. But trees absorb this extra water and use it to grow shoots and leaves at the expense of fruits.

As part of a project jointly funded by the USDA's National Institute of Food and Agriculture and the National Science Foundation, Hoth's team is developing a horticultural sensor system. The technology must detect the surface temperature of the fruit and fine-tune the supply of cold water for evaporative cooling.

Using infrared cameras and miniature weather stations, the prototype activates the top sprinklers exactly when they are needed, minimizing the negative effects of spray cooling. As an added benefit, the scientists have also developed a smartphone app that uses data from a nearby weather station as well as a low-cost thermal/RGB camera to measure fruit temperature and heat stress hazards.

Khot systems can send real-time data to growers to help them make decisions about managing heat stress and, in the future, storing and marketing their fruit, as sun-burnt apples go bad quickly in storage.

Other interesting news:

▪ Playing with dolls develops empathy

▪ Instant Blood

▪ Electric battery made of concrete

▪ Accelerometer ST Microelectronics LIS3DHH

▪ Processor Cortex-A72

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Preamplifiers. Article selection

▪ article Do not renounce, loving. Popular expression

▪ article Which country had vessels to collect the tears of the mourners? Detailed answer

▪ article Basic requirements for projects of industrial enterprises and industries

▪ article Restoring the backlight of a TFT monitor. Encyclopedia of radio electronics and electrical engineering

▪ article Match in balance. Focus Secret

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews