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Many industrial concerns have workshops of their own. For the repair of worn shafts, the lathe machine is excellent. Keyway slots can be machined by using a milling machine, while a shaping machine can do machining of large flat areas. A drilling machine does drilling of holes. A skilled Maintenance Engineer should know how to use all these machines in order to make his own repairs in a safe manner. Very often he has to supervise machinists. The information below should be useful for that purpose. Lathe Machine The lathe machine uses a single-point-cutting tool for a variety of turning, facing, and drilling jobs. Excess metal is removed by rotating the work piece over the fixed cutting tool to form straight or tapered cylindrical shapes, grooves, shoulders and screw threads. It can also be used for facing flat surfaces on the ends of cylindrical parts. The work piece is clamped onto a horizontal rotating shaft by a 3-jaw or 4-jaw chuck. The latter chuck can be used to cut off-centered cylinders. The rotating horizontal spindle to which the chuck is attached is usually driven at speeds that can be varied. The cutting tool is fixed onto a tool rest and manipulated by hand. It can also be power driven on straight paths parallel or perpendicular to the work axis. This is useful for screw cutting. Internal turning known as boring results in the enlargement of an already existing hole. The holes are more accurate in roundness, concentricity, and parallelism than drilled holes. A hole is bored with a single-point-cutting tool that feeds along the inside of the work piece. Shaping Machine The shaping machine is used to machine flat surfaces, grooves, shoulders, T-slots, and angular surfaces with single-point tools. The cutting tool on the shaper oscillates, cutting on the forward stroke, with the work piece feeding automatically toward the tool during each return stroke. Drilling Machine The drilling machine is used to cut holes in metal with a twist drill. By changing the cutting tool, they can be used to do reaming, boring, counter boring, countersinking, and threading. Milling Machine The milling machine uses a rotating cutting tool to cut flat surfaces, grooves, and shoulders, inclined surfaces, dovetails, and T-slots. Cutters of many shapes are changed to cut different grooves. Cutting Tools Metal-cutting tools are classified as single point or multiple point. The lathe and shaping machine use single point cutting tool while the milling and drilling machines use multiple-point-cutting tools. Metal is cut either by moving the work piece like in the lathe or by moving the tool like in the shaping machine, drilling or milling machine. Clearance angles must be provided to prevent the tool surface below the cutting edge from rubbing against the work piece. Rake angles are often provided on cutting tools to cause a wedging action in the formation of chips and to reduce friction and heat. Tool Materials In order to remove chips from a work piece, a cutting tool must be harder than the work piece and must maintain a cutting edge at the temperature produced by the friction of the cutting action. Carbon Steel Carbon steel tools even though comparatively inexpensive tend to lose cutting ability at temperatures around 400 degree F (205 degree C). High-Speed Steel High-speed steel, containing 18 percent tungsten, 4 percent chromium, 1 percent vanadium, and only 0.5 to 0.8 percent carbon, permits the operation of tools twice or three times the speeds allowable with carbon steel Cast Alloys Cast-alloy cutting-tool materials containing cobalt, chromium, and tungsten are effective in cutting cast iron and retaining their cutting ability even when red hot. Cemented Tungsten Carbide The hardness of Tungsten Carbide approaches that of a diamond. Tungsten carbide tools can be operated at cutting speeds many times higher than those used with high-speed steel. Oxides Ceramic, or oxide, tool tips consist primarily of fine aluminum oxide grains, which are bonded together. These are very hard. Cutting fluids An overheated tool can become blunt and soft very fast. Therefore very often, cooling fluids cools the cutting points of the tool. This serves to lubricate and cool. Water is an excellent cooling medium, but it corrodes ferrous materials. Sulfurized mineral oil is one of the most popular coolants as it can both cool as well as lubricate. The sulfur prevents chips from the work from melting on to the tip of the tool. male pnis enlargement enlargment manhattan penis free penis enlargement technique magna rx results review vig rx scam natural pennis enlargement technique vig rx side effects pennis enlargement tip

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A survey of 200 women, aged over 18 years and from different ethnic groups, showed that 164 women were happy to have a partner with a penile size that was big enough to satisfy them (in this survey, this penile size was found to be about 6 inches, or 15.24 centimeters). A minority, 18 women, preferred men with larger than average penile size (7 to 8 inches or 17.78 to 20.32 centimeters), while another minority, 14 women, actually preferred men with a smaller penile size (about 5 inches or 12.7 centimeters). The same group of women felt that the width of the men’s penis was more important than the length, as they believed that they enjoyed the feeling of a thick penis against their vaginal walls rather than the sensation of an unusually long penis thrusting into their insides. Most of the women also preferred their man to have a proportional penile size, that is, a length that is proportional to the width. The penile factors that the women in this survey listed as most important to them were: Cleanliness Size Complexion Smoothness Absence of veins Another survey, done in 2000, of 50 women aged 18 to 25 years, revealed that 45 of them said the width of the penis felt better to them, while 5 of them said the length of the penis felt better. Some of the women reported that sex in a relationship was better than sex without commitment. A possible reason for the women in this survey preferring the feel of the penis’ width is that this would contact with the outer part of the vagina, including the clitoral area. For most women, the sensitive areas are the clitoris and the vaginal opening. Also, the first two or three inches inside a vagina are more sensitive, while the upper two thirds of the vagina has far fewer nerve endings and is less sensitive. The vaginal walls also depend on pressure for sensation. Another sensitive area is deeper in the tissue of the vaginal wall. Called the “G spot”, this area requires more stimulation before a woman responds. From these surveys, we conclude that most women prefer their men’s penile size to meet their own physical and psychological needs. A recent sex survey of women done in the UK, for example, does not even place penile size among the top five male attributes that the women considered important. The top attributes of men ranked by the respondents were, in order of importance, the face (55 per cent of the women surveyed), hair, shoulders, chest and hands. What you need to do, when it comes to penile size, is to find out what your woman really wants! And here’s where we can help you, in this website, to know better what really stimulates both you and your woman when it comes to penile size and other related factors. Visit Penile Enlargement Blog For More Advice. penis enlargement video penis enlargement pills pro solution enhancement manhattan penis surgeon penis enargement forum penile enlargment supplement top penis enlargement pill pnis enlargement technique penis elargement pic before and after free penis enlagement video

Circumcision is the surgical removal of the foreskin (prepuce) of the penis. Most of the time circumcision in infant boys is usually performed for cultural or religious reasons, but people believe that this operation provides some medical advantages. Regarding medical advantages of circumcision, doctors opinion are divided, many of them showed that the medical advantages are considered to be slight, because conditions such as phimosis and cancer of the penis are rare even in men who have not been circumcised. One after another, they said, the minor benefits of circumcision seem to be contrabalanced by the minor risks, so this operation is neither essential nor detrimental to a boy's health Recently, a study issued in The Wall Street Journal, concludes that male circumcision reduces the risk that men will contract HIV through intercourse with infected women by about 70 percent. A study of more than 3,000 circumcised men in South Africa was done by the French agency for Aids and Viral Hepatitis. The data, outlined at a conference in Brazil, suggests circumcision could be effective in preventing the spread of HIV among men and shows male circumcision prevented about seven of 10 infections. UN health agencies have cautioned that more trials are necessary before they will recommend this as a method to protect against AIDS. To have a full conclusion, further trials are being carried out in Uganda and Kenya to measure the effect of circumcision on other populations. penis enlargement forum penis girth enlargment penis enhancement pic before and after best penis enlargment penis enargement before and after pennis enlargement patch penis enhancement surgeon pnis enlargement operation free penis enlagement video

Is there a link between penis size and body height? A 2002 study conducted by the British Journal of Urology gives some answers. Maybe this is one of the most popular myths about the size of the penis : while you could easily guess the shapes of a woman’s breast, legs and hips regardless of the clothes she is wearing, guessing a man penis size is notoriously a harder task without direct and real observation. Of course, some “happy few” can clearly boast – but this is rare – a big bulging organ behind their clothes. That’s also why many people still believe that the penis size could be related to factors like the size of the ears or nose, or the size of the hands or feet. Let’s go back to scientific facts : in 2002, a study conducted by the British Journal of Urology made clear there was no correlation between the size of the male foot and the penis size. It is also true that the study did not focus on body height to identify the penis size, but the result has of course every chance of applying to it. It must be understood that the penis is an appendage like the ears or the nose, and that it is not influenced by the body height. In fact, penis does not follow the same rules as bones or muscles which match the body height to simply sustain its weight and maintain its common erect posture. Study found that there is also no correlation between the limbs and the penis – even it is made clear that the development of the penis and the limbs inside the womb is controlled by the same genes. Remember that the overall human body development during childhood and puberty is controlled by genes and hormones in large numbers. And that is very unlikely that genes or hormones could control the size of two different parts or organs. This is why science has to do such myths justice or disapprove them forever, because there is no indication that they will ever vanish from the vast ocean of common ideas shared by mankind.