How do conveyor belts work??
357260
A belted conveyor usually has two pulleys, one at each end that slightly stretch the belting to maintain the belt's position and to provide increased friction between the belt and the pulley.  One of the pulleys is driven, usually by a motor, leaving the other pulley as an idler pulley.  The motor rotates the belt around the two pulleys.\n\nBetween the pulleys is usually a smooth, wear resistant surface that the inside of the belt glides across.  This surface supports the belt and whatever may be riding on it, but has a low friction surface so the belt slides easily across it (think of a tablecloth on a table).\n\nSome belts will have a small raised section on the inside of the belt.  This helps improve the belt's tracking across the pulleys.  Without it, the pulleys need to be exactly parallel and belt in in good condition.  Otherwise the belt has a tendency to eventually roll off to one side or the other.
215643
Well, basically, the formula of work is Work = Force * Distance\nSo...\n\n1)If a machine is used to move the object while the object is on the machine rather than on the ground, the work is not done on the object, since it does not move... That is to say, relative to the machine, the object remains in the same part of the machine. In this case, the work done is on the machine.\n\n2)If the force is in the oposite direction of the motion of an object, work IS done. Its just that it is negative. That is to say, work is done in stopping the object, so, it has a negative sign.\n\n3)If force is greater than the friction, the object DOES move, so work IS done. If it is less, the object does not move. Thus, no work is done\n\n4)Even if the object accelerates, it is moving, so, work is done
700297
Yeah, a friend had one of those. Um... let me see how to explain it...\nWell, the staples load from the rear. At the base of the big handle, there should be a tab or black plastic thingie there (yeah, I know...so technical). Just pull it straight back. Directly back from the handle all the way out and put some staples in. Then, try to get the parts back on track and let it go. It has a spring that pulls everything forward.\nIf that doesn't work, I must be remembering wrong.
550617
Take a rope ( that doesn't elongate/stretch easily), wind round both pulleys (just the way belt goes)and mark one end where it touches the other. Measure this and the size in inches is the size of the belt. As to whether 'A' or 'B' or 'C', it is based on cross-section. The smallest is 'A'. I hope I am understood.
1021315
It is usually self-hoisting. There is motor and gear assenbly that lifts the crane within the tube (usually a future elevator shaft) the is constructed around it. Then it is bolted down and goes back to work.
745227
Generally simple machines include levers, wheels and axles, belts and pulleys, gears, and inclined planes.   This site should help you.  Best of luck with it.
327860
I think it's just called belt loops. :)
360899
Yes, this is the principle that motors work off of.  It is also used for other purposes, such as launching roller coasters.  While it is possible to control the strength of the magnetic field in an electromagnet, permenant magnets cannot have their fields controlled.  So, in order to control the force between two magnets, only one of them must be controlled, so one may be an electromagnet and the other a permenant magnet.
504491
Equipment you use, materials you throw out.  Think of a bulldozer (equipment) pushing dirt (material).  You keep the bulldozer and get rid of the dirt.\n\nGood luck.
947961
Alien's answer is very good...\n\nOn same subject ... when I was a kid, I was fascinated to learn how the buzzer works. It is more or less the same principle but with mechanical and electrical 'actions' -- when you press the button you close a DC electrical circuit that activates an electromagnet that pulls a little hummer that rings a bell. As soon as the 'hummer' moves it disconnect the circuit and the magnet does not work any more. The 'hummer' goes back to its initial position b/c it has a string attached, But then it closes the circuit and everything repeats... ha-ha-ha, I still remember my first impression
951860
It's difficult to explain without diagrams.\n\nFirst you have an air supply at about 20 psi that flows through a restrictor and a small nozzle the same size as the restrictor. There is a flapper, a small piece of metal that covers the nozzle and controls the backpressure between the nozzle and the restrictor. The pressure between the restrictor and the nozzle is controlled between 20 and 100KPa (3 to 15psi) by the position of the flapper. The position of the flapper is controlled by the input current (usuall y 4 to 20mA of 1 to 5V). Thus the input signal varies the pressure out. I havent seen any links but I will look
254567
It is a horizontal belt which is mechanically driven in a continuous loop.  Items are laid on it and moved by the belt to eliminate manually carrying them.
941524
Gee...broad question...depends what ur transporting.\ne.g. for gases u need a semi-permeable membrane, a thin membrane, a gradient, a moist/mucus surface
256712
Try what is said above, could be something simple. Also, you may need to open it up and look around. I not ever looked at one like yours, but, it has to have a way of feeding the Paper, gears, stepper motor. Look for worn, loose parts or a slipping gear in that area.
652413
Engineers use a cable and pulley system to pull the cables that are on the ground up to the insulators on the very tall towers.  Then they pull the cables at the end of the respective run to tighten them to specifications.
1015766
Two times of mines. Open pit or strip mining where the overburden (ground cover) is removed by large earth moving machines, e.g., giant drag lines, Once the coal seam is exposed, it is removed by blasting, and the use of large shovel and trucks.\nIn an underground mine, there are two basic types. First roof and pillar where the coal is removed by cutters and either loaded directly onto or trucked to conveyor belts to be brought to the surface. The pillars support the roof from collapsing but also represent coal that is left behind. The second is called long wall mining where a long (600")continous cutter removes the coal and loads it directly to a conveyor belt. The cutter is supported by a large hydraulic roof support system which protects the cutter as it moves forward. The roof of the seam is allowed to collapse behind the long wall miner.
1043544
The part about the conveyor belt is true, that was a big advance.  But by reducing the cost of the car to something that the masses could afford, a huge amount of demand was created in supply industries including mining, steel, rubber, and also road building--it was a lot of jobs, and all those people made money and spent it buying things and that employed lots of other people.  It was a huge boost to the middle class, the biggest market.