Mechanical Engineering

normally thickness will be 3mm. but it defer in sizes

The tools used for cutting and drilling applications are tipped with diamond, the hardest substance on earth, which is an allotrope of Carbon.

It would depend on what you want to use the belt and pulley for

Three types of impeller.

A- Semi open

B- Open

C- Close

Rajeev Singh

All in good time, powered flight has only been around for just over 100 years. Right now the cost and technology isn't in place.

It is an attraction used for sights at a very high altitude. You can see a lot of London when at it's high points.

When an solid wire/string is stretched, its length increases and diameter decreases.

Transverse strain=d/D d=change in diameter D=original diameter

Longitudinal strain=l/L l=change in length L=original length

Poisson's Ratio=Transverse strain/Longitudinal strain=dL/Dl Alternatively, think about it in 3 dimensions. Assume we are pulling a piece of rubber in one dimension (X axis). In that dimension, the rubber gets longer. In the other 2 dimensions (Y and Z axes), the rubber gets smaller. (It 'necks' down.) For an incompressible material, the total volume cannot change with applied load, so for each unit the rubber gets longer in the X axis, it must get shorter in the total of the other 2 axes (Y + Z). Assuming the material is isotropic (as pure rubber would be), the changes in the Y and Z axes would be the same, and would need to total that of the X axis. So, as described above, Poissons Ratio would be dZ/dX or dY/dX, both of which would be 0.5 .

Adv, Gear Systems- 1.Provide Positive Drive without slip. 2. Suitable for high speed , high torque & high power transmission. 3.Properly designed & properly maintained gear system can run over decades. 4. very high transmission ratio is practicable. 5. Compact machine train in limited space. Dis Adv. Gear Systems- 1. Needs Proper Lubrication System. which involve high cost. 2. Needs Proper alignment- misaligned gear train will demage within very short time. 3. misaligned gear mesh or lack of lubrication will make noise & vibration. 4. Spare gear is costly and proper replacement gear is difficult to procure in many cases it is available only from OEM source. 5. Require skilled technician to maintain. Adv. Belt system. 1. It is a simplier system than Gear System. 2. It do'nt need lubrication. 3.Belts can be replaced easily. 4.Belts are easily available in market. 5. Belts can accomodate some mis-alignment. Dis Adv. Belt System- 1. Not suitable for high speed, high torque or high power transmission. 2. Belt life is very short so needs frequent replacememt. 3. Belt Slip causes poor power transmission, heat generation, pully wear. 4. Open belt is unsafe. 5. Require more space so it can'not be used in a compact system. Answer by - Engr A Z M Aurangazeb , Email- aaurangajeb&gmail.com or abu.aurangazen&mobilbd.com

i don't know this is why i asked

absorption refrigeration is when ice is put in a compartment above a warmer compartment and absorbs rising warm air thus making it colder.

Steel wire mesh is welded by spot welding which could be continuous or staggered, depending on the application and strength of joints required. Sometimes, they are fastened by screws to the frame which serves as retainer also.

In Pressure Welding the parts(work pieces) to be joined are heated only up to the plastic state and then fusedtogether by applying the external pressure.the two different types of pressure welding are:forge welding and resistance welding

A lathe has one workpiece spinning on an axis, which the operator holds a tool to to cut the material. A duplicator has two workpieces, and a probe touching one piece causes a tool to cut in to the other, creating a duplicate of the probed piece.

the pitch is the inverse of the the thread count per inch, or the distance between each thraed

pitch = 1/N

so for a tap of 32 threads per inch pitch is 1/32 = 0.03125 inch

it will increase its performance

Depends.

Bicycles with external gears have chain-and-sprocket gears.

Bicycles with internally geared hubs have both a chain-and-sprocket gear and spur gears (usually in a planetary configuration) inside the rear hub.

Then there are the rather rare shaft-drive bicycles, which use bevel gears. And maybe an internally geared hub as well. Then there's the occasional belt drive bike of course. And one or two CVT designs.

Concrete pipes used to carry water were sometimes made with asbestos, which was used to stregnthen the pipe. Over years and years of water running through the pipes, some erosion will occur and asbestos fibers will get into the water being distributed - although in very low concentrations. If the use of water contaminated with small concentrations of asbestos is harmful, then asbestos use in water pipes is harmful. The problem is that there is no agreement in the scientific community as to whether asbestos in water at the concentrations observed is, in fact, harmful.

because water has a surface tension that likes to hold together. How much it takes to hold it together is based on what incline it is on. In this case, wave patterns are observed because the surface tension keeps a larger amount of water in one place, until the weight overcomes the surface tension, and it creates the wave pattern you see.

Yeah you can. It's better to use the plastic blockers that come on the rope, But it won't hurt your rope to use wire blocks.

A 487 is a high strength low alloy steel. there is nothing such as a carbon steel .iron becomes steel only when carbon is added to it.steel itself is an alloy of iron and carbon.hence the term carbon steel is wrong it is just steel.

Forced convection are used in car radiators, cooling towers, air cooled heat exchangers etc.

It is the couple which tends to make the leading wheels sway from side to side, produced due to separation of unbalanced primary forces along the line of stroke by some distance.

Performance-Oriented Packaging Standards went into effect in October of 1996.

Discrete is something that is not continuous, or in other words. Not doing it continuous.

You can find one online at many different stores. You can try www.precisionscrewthread.com or www.Ball-Screws.Industrial101.com.

Ball Screw thread is very advanced and complicated technology. For getting ball screw thread you will need good and advanced CNC machine.