Mechanical Engineering

One way is to cut a piece of construction paper, staple equal-sized streamers on one side in a row ( ten is a good amount), then form a circle with the paper and staple it. Make at least 3 (6 would be better), equally spaced holes, with a hole-punch. Attach a string to each hole, tie a knot in all the strings at once, so that all the strings are equal in length and attach it to a pole (the taller, the better).

For home units, the compressor is the outside, large box shaped unit that is usually on the side, or behind the house. It takes the freon gas from inside the home compresses it into a liquid, where it will be pumped back inside to the condensor. Compressing gas creates heat, so a fan draws air through the cooling coils on the side of the unit, and blows it out the top. It is important that these coils are kept clear of debris, and should be periodically sprayed off with a hose to knock off dust that may have accumulated.

Now that the freon gas is compressed, it gets pumped inside the house to the condensor, where the pressure falls, allowing the freon to return to a gas. This creates an endothermic reaction, drawing heat from the air. The condensor unit has a series of coils with fins that get very cold. The warm air in the house is blown over these coils, cooling it, and then through the ductwork of the house, and out through the registers.

That completely depends on the circumstance- size of part, whether it is quenched, allowed to cool in air, or kept at elevated temperature deliberately (post-heat), what metal... There are many, many variables.

1) When preparing materials in readiness for the marking out activities you can use things such as engineers blue to enhance the visibility of the lines and positions you mark on the work piece. You should also make sure that the material has not got any previous marks or lines on it so the ones you draw on are more visible and you do not get mixed up with the previous.

Yes - there are many different formulae but the relationship of hardness to tensile or yield strength is at best very approximate. There is a general increase in hardness with increasing strength for most metals - where hardness has been measured by an indentation method such as Brinell.

all most any thing. including removing your pubs

If the pressure in a steam boiler exceeds a set limit, a safety valve is provided that will open to relieve the pressure. This prevents a boiler explosion. When the pressure is being relieved in this way, very hot steam will be release from the valve. The hot steam is extremely dangerous to people, therefore a discharge is provided. This is a pipe or other means of directing the hot steam to a release point outside, away from where people are likely to be.

.036 inches or .913 mm.

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Multiple reasons to have an electrical engineer in a contrsution company 1. He/she can help the company 'bid' or try to get work for the company. The better an electrical engineer the better she can price the construction work to be done for the client. Also if they are really tricky they can find problems with designs (done by the consultant) and not inform the consulting engineering firm until they realize at which time they will be charged a premium price. Example: Design Engineer forgets a receptacle (plug) in a specific area, which would normally cost $120 with labour; however after the dry-wall or the wall masonry is done, the cost would jump to $1000 and the whole time the constructing firm know about it. 2. If the engineer is very knowledgeable they can find ways to save their client money. For example: a design engineer completes a design, but it's costly to build. In return the construction companies' electrical engineer can find a way to save the client money. This usually happens after the job is awarded, in other words if a design is sent out for tender, and is awarded to constructino company ABC, they say it will cost $20,000 for the construction. However after they convince the client of their design, they can save them $1,000, but in reality the construction firm already priced $1500 for this portion of the work. So they only 'save' the client $1000. This doesn't always happen, but more often than not. 3. Lastly sometimes the construction firm needs local support for certain portions of work which need to be addressed immediately. expecially on oil riggs. Etc. Electrical Engineering Consultant

Integral gear centrifugal compressors represent the latest

technology offering significant advantages over outdated,

less efficient and more costly compressor designs. These

advantages are inherent in the centrifugal design and

enhanced even further by Compression Systems' more

than 50 years of centrifugal expertise

ata = atmosphere absolute

These data depends strongly on the chemical composition.

For gasoline: the freezing point is from -40 0C to -60 0C

For Diesel fuel: the freezing point is from -6 0C to -20 0C

Yes, which is why most machine tool castings are made of cast iron.

There are different amounts of money that different rocket scientists will get. A rocket scientist who has made major discoveries will make more than one who is new.

Fan coil units don't have inherent static pressures, but it has to overcome the static pressures when it will be ducted to a system. Static pressure and pressure losses however can be determined accordingly in ducts. The designer sizes up the ducts to overcomes this losses and give the fan's output to the point of application sizing the duct to overcome frictional losses as much as it could to meet the space requirements cooling load. This value is the amount of resistance the fan will be able to overcome within the system it is ducted to and still be able to provide the designed air flow. For example if your fan coil unit is ducted on the supply side and the total frictional resistance of the ductwork and diffuser is below that of the fan coil units static pressure you won't have a problem. If on the other hand, the frictional resistance is greater, you won't see the design air flow at the diffuser. In general you can calculate a system's resistance with the following rules of thumb: 0.1"/100ft of duct, 0.1" per elbow, 0.1" at the diffuser. The fan will probably rated between 0.3" & 0.7" of water gauge.

strength of material refers to the ability of a material to withstand an applied stress without failure.the material"s strength is dependent on its microstructure.Strength is considered in terms of compresive strength, tensile strength, shear strength,namely the limit states of this strength.The term of strength of materials most often refers to various methods of calculating stesses in structural members, such as beams,columns and shafts.

I found a web site that explains how to do it:

(1st link)

It seems to make sense, but I have not tried it yet.

That is for single phase induction motor

here is for three phase motor

(2nd link)

I tested both links and it works perfectly.

it is an old machine.It can be ised for various operations like turning,taper turning,knurling,slotting,facing,threading etc. But it can be used mostly only for cylindrical jobs. you can find it in many small workshops.

in 1810 Robert goddard invented the rocket

Fine grains are harder than coarse grains

Carbon Steel is used upto 427 oC or upto 1100 oF.

The external housing (shell) of gate and globe valves are similar, but the globe valve is designed to serve as a regulating valve, meaning that it can adjust the flow by the percentage of the opening. However, the gate valve is not designed to regulate flow, but to stop the flow. A gate valve should always be either fully open or fully closed.

The main difference is in the form of the inner elements and the form of the flow inside the valves. In addition, the gate valve may have a rising or non rising stem while the globe valve is typically a rising stem design. The direction of flow through a gate valve is not important. However a globe valve has a flow direction indicated on the outer shell (body) which indicates the direction of flow from beneath the seat.

In a gate valve, the closure element is a plate or disk which travels parallel to the plane of the seat. The gate in a dam is a well known example. In a globe valve, the closure element is usually called a "poppet", and it travels perpendicular to the plane of the seat.

There are specific advantages and disadvantages to each type depending on the application. The application for a globe valve is regulating flow. It is not well suited for full stop isolation. The gate valve is an isolation valve and not designed to regulate flow.

Tool Steels are produced in many chemical compostions. They are divided into categories based on their intended use or their heat treating method. The categories include cold work, hot work, high-speed, shock-resisting, oil hardening etc. Within each of these categories there are limitless grades, each with a different chemical compostion.

Generally, tool steels will have a minimum of .4% carbon with additions of manganese, vanadium, chromium, molybdenum and silicon with the balance of the composition being iron. These elements are added in various percentages to achieve a tool steel that will perform a required purpose.

For more information on tool steels and their alloying elements, properties and heat treating, see the related link.