Different materials have varying levels of hardness, ductility, and thermal conductivity, which can impact the feeds and speeds used during machining. Hard materials may require slower speeds and feeds to prevent tool wear, while softer materials can withstand faster cutting speeds. Ductile materials may need lower feeds to prevent chip buildup, whereas brittle materials can tolerate higher feeds. Thermal conductivity can also affect the heat generated during cutting, influencing the selection of feeds and speeds.
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Trepanning was used as far back as the Neolithic period, around 10,000 years ago. It continued to be practiced in various civilizations throughout history for treating head injuries, relieving pressure from brain swelling, and for spiritual or ritualistic purposes.
The vehicle manual usually says what speeds to do in which gears.
Ancient cave peoples treated Migraine with a procedure called Trepanning.
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The speeds and feeds to be used in machining operations are determined by several factors, including the material being machined, the type of cutting tool being used, the desired surface finish, and the machine's capabilities. The material's hardness, thermal conductivity, and machinability all play a role in selecting the appropriate cutting speeds and feed rates. Additionally, the tool's geometry, coating, and material will influence the optimal cutting parameters. It is essential to consider these factors carefully to achieve efficient and effective machining results.
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Slower speeds would be recommended.
Skulls from primitive man have been found with holes bored in them for brain surgery (called trepanning)
Trepanning or trephining, in which the surgeon drilled a hole as large as 1-2 in diameter in the patient's skull without benefit of anesthesia.