Cutting tool straightening. Drawing, description

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Cutting tool straightening. home workshop

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For high-quality wood processing, planer irons, chisels and other tools must not only be sharpened, but also corrected. This is achieved by grinding on a whetstone - an operation usually performed manually and requiring, as a rule, more skilled skills than sharpening on an electric grinder.

We offer a simple device for mechanization of the straightening process. With its help, finishing the tool to the required sharpness is accelerated by four to five times, debilitating monotonous hand movements are excluded.

The device consists of a base made of a duralumin corner and playing the role of a guide, a runner with an abrasive and a rubberized roller connected by a rod to the runner. As an abrasive, a fine skin, a touchstone can be used; the authors of the device used a block of synthetic diamond, which is sold in household goods stores.

We press the tool to be sharpened against the stop so that the edge to be edited with the entire plane neatly lies on the abrasive. The stroke length of the abrasive bar is adjusted by transferring the rod into the corresponding hole on the roller.

Cutting tool dressing
Device for dressing the cutting tool: 1-base - guide, 2-runner, 3-abrasive, 4-machine, 5-shaft, 6-roller, 7-rod, 8-stop

You can install the fixture on any machine that has a spindle with a chuck, or adapt any electric motor with a power of 40-100 W; especially convenient is the engine from the sewing machine with an adjustable number of revolutions, as well as the now widely used machine "Skilled Hands".

Author: R.Kravtsov

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Smoking mother harms unborn child 02.09.2013

Scientists have found out how nicotine consumed by a pregnant woman affects her offspring. It turns out that nicotine not only promotes addiction and craving for smoking in a child, but also leads to a tendency to lead an unhealthy lifestyle.

It is well known that smoking during pregnancy alters the development of the fetal brain and increases the risk of preterm birth, low birth weight and miscarriage. In addition, prenatal nicotine exposure is known to increase the likelihood of tobacco use and nicotine addiction later in life, but so far the mechanisms of nicotine's effects on the unborn have remained unclear.

To uncover these mechanisms, Rockefeller University neuroscientists injected pregnant rats with low doses of nicotine, equivalent to one cigarette a day for a pregnant woman. Scientists have studied the brains and behavior of rat offspring and now understand why people exposed to nicotine in the womb are more likely to become smokers. In addition, other very serious negative side effects were found.

It turns out that nicotine increases the number of specific types of neurons in the amygdala and hypothalamus. Cells in these areas of the brain produce orexin, enkephalins and melanin-enriching hormones, in other words, neuropeptides that are responsible for stimulating appetite and increasing food intake. When exposed to nicotine in the womb, more cells are formed in the brain that produce these hormones. As a result, the younger generation is not only more likely to use nicotine, but also prefer to eat more fatty foods and drink more alcohol.

Thus, exposure to nicotine in the womb stimulates an unhealthy appetite in the offspring, which end up prone to overconsumption of nicotine, drugs, alcohol, and fatty foods. In fact, one cigarette smoked per day, or a similar dose of nicotine obtained from a patch or an electronic cigarette, leads to the fact that the mother "programs" her child's body for unfavorable development.

It is very difficult to fight this innate feature; this requires the strong will of the "affected" teenager and the appropriate environment, where only a healthy lifestyle is the norm. Unfortunately, during adolescence, these two factors are usually in great deficit.

Previously, the same scientists found that excessive consumption of fatty foods during pregnancy also creates a harmful tendency to overeat in future offspring. In general, it should be stated that pregnancy is a greater responsibility than some people believe.

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