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Why does hydraulic jack for main engine cylinder head gets stuck while opening?

If you are using the jacks to undo the head nuts you must back the jack off a full turn, pump the jacks up to pressure and you should then be able to back the nut off less than 1 full turn. If the nut is brought up to a stop against the jack and tension is released it will bind. On tightening down you can screw the jack down onto the nut without backing off, as when you tension you turn the nut down and away from the jack.


What is the function of a simple machine lever?

to make your work easier . to less the working time


Types of milling machine?

Horizontal and vertical milling machine.


What is Perpetual Motion Machine first kind?

A perpetual motion machine of the first kind it what we usually mean by a perpetual motion machine. A device which once started will continue to run and do useful work forever without the need to add energy to keep it going. The laws of physics make such a device impossible.


Where was the milling machine invented?

It appears that in 1816 The Milling machine was invented to reduce hand filing of intricate shapes. (Simeon North, Harpers Ferry Armory USA) Later, in 1818, Whitney invented the first milling machine." From another source. A bit later in 1818 Eli Whitney (inventor of the cotton gin) invents a milling machine in New Haven Connecticut. Prior to the milling machine being invented, a machinist's tools were primarily files and required a highly skilled operator. The milling machine allowed a less skilled operator to make the same quality of parts as the skilled operator with the file. This milling machine found use making rifles for the government.