Blog | Hi-Tech Engineering Services LLC Sharjah UAE


Something About Air and Water Cooled Chillers

by on Jul.23, 2010, under Mechanics

The most common compressors used in refrigeration are reciprocating, scroll, screw-driven centrifugal. With various refrigerants chillers used in industry in industrial application, chilled water or other liquid from the chiller is pumped through process. Industrial chillers are used for cooling of products and factory machinery in a wide range of industries.

They are often used in the plastic industry in plastic processing like injection molding, blow molding, extruders, laminations, p.P. Films, rigid p.V.C. Pipe, calendars, chemicals, pharmaceutical process, dyes intermediates, mineral water soda process, paper converting, coating chill rolls, plating and anodizing, lubricants/oil cooling, dairy, bakery, food products, dehumidifier, conditioned air, welding equipment, cement processing, vacuum systems, x-ray diffraction, analytical equipment, compressed air and gas cooling.

Chillers are usually small in size (cooling capacity), usually from 1 tons to 100 tons.

Central chillers generally have capacities ranging from ten tons to hundreds or thousands of tons.

Water chillers can be either water cooled or air-cooled. Water cooled chillers offer efficiencies better than air cooled is due to heat rejection at or near the air’s wet-bulb temperature rather than the higher, dry-bulb temperature but it is used in conjunction with cooling tower.

The heart of the chiller is the refrigeration compressor. This is a pump that uses electrical energy to pump refrigerant around the system. Depending on the application like size or operating temperature, a different compressor pumping technology is used. Smaller chillers use refrigeration compressors like rotary compressors, scroll compressors, and reciprocating compressors. Larger chillers use refrigeration compressor like reciprocating compressors, screw compressors, absorption compressors, and centrifugal compressors.

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7 Different Types of Milling Machines

by on Jul.23, 2010, under Mechanics

Milling machines come in various types with a variety of functions based on certain standard specifications. Some of the most commonly used machines are the following: column, turret, C-frame, horizontal, bed type, planer-style, and tracer controlled.

A milling machine is a tool in the metal industry that has numerous functions. Each machine has a cutter that operates at a various range of speed so you can form the required shape. With its adjustable spped feature, each milling machine can be regulated for a more precise cut. The machine is capable of handling multiple tasks such as carving, threading, milling, drilling, and cutting. There are several several types of milling machines, each with varying functions based on standard criteria. Manufacturers often name the different machines according to the kind of control, number of axis present, orientation of the spindle, size of the tool, its purpose, and source of power. While there are several varieties of milling machines available today, they essentially serve the same functions but use different terminologies. Below is the list of seven types of milling machines.


This is the most common milling machine, which has 5 basic components, They are the work table, saddle, head, knee, and over arm. Considered as the simplest machine type, its cutting device is vertically suspended to allow drilling of metals. This is typically used when creating car parts because it is small and handy.


The turret is also known as the Bridgeport-type and can be repositioned anytime you want making this machine very functional. Its versatility makes it more practical since a variety of products can be made in addition to car parts.


Because it is sturdier than a turret, this type is popular in industrial settings. It comes with a hydraulic motor, which makes it very powerful.


This machine runs parallel to the ground. The table from which the object to be worked on is placed moves sideways while the cutting device goes up and down.

Bed type

The worktable is located on the bed itself, instead of being paced on top, its usual position. The knee part of the machine is omitted to allow movement in a longitudinal direction.


This machine type is basically the same as the bed mill. However, the planner-style includes cutters and heads that allow for a wider range of milling actions.

Tracer controlled

This type of machine has the ability to reproduce parts based on a master model. Most of the industrial sectors, especially the automotive industry, choose this type of machine because it make production and specialization of machine parts easier. With the vast classifications of milling machines, you need to choose the one you need according to how you intend to use it. However if you find it difficult to decide, do not hesitate to seek the help of a specialist who can help you select the one that will give you maximum benefits.

If you need help, or to find out about spindle repair, please visit Motor City Repair for more information.

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Synopsis of Different Types of Welding Products

by on Jul.23, 2010, under Mechanics

The welding industry has developed a lot, and a lot of equipment and tools are available and still more tools are to be introduced. To become a good welder or to become a famous entrepreneur in welding industry, knowledge about the welding tools is must and we should update our mind and should be aware of the welding tools. Let us see the different types of welding tools in the following lines.

Welding products:
Under this category we are going to see the different types welding products and its uses. There are different types of welding such as mig, tig, stick and submerged arc, each type of welding uses different tools. For welding industries and workers, it is always better to have equipment which best suits and do all kinds of work. For mig welder, there is a welding product which meets almost all repair needs. Inverter welding machines are the one which suits for all mig welding work and at present single phase machines is there which are convenient and portable and can go anywhere you need. You need not run back for more wire; it has a 12lb roll capacity with optional drive rolls. It is used in general repair, automotive, motor sports, agricultural and more.

Tig welder products:
If you are a tig welder, then know about the power tig series that is focused on user convenience and it exists in different types such as power tig 200DX, 250EX, 315DX, 225LX and power 1-tig 200. It is designed to weld any types of steel and stainless materials and it is easy to repair in the field and garage, and each power tig series can weld aluminum of different thickness and used in general repair, light industrial and light fabrication. Power tig 250EX and power tig 315DX are the three phase machines and others are single phase machines.

Power arc welders:
It is a product made for stick welders and it can be used in any place where you have 220v single phase current. It exists in two types such as power arc 160 and power arc 200, power arc 160 has the following features such as smooth dc arc, low power consumption, high duty cycle with digital display and adaptive arc force control. It is used in welding repair, garage, factory, shipyard and pipeline and used to weld steel, aluminum and cast iron. Power arc 200 also has the same features as that of 160 series, but the difference is power arc 200 has 200A rated output whereas the former one has 160A rated output.

Multi purpose units:
Buying separate units for welding may increase your budget, and do you want the unit which performs multi function purpose? Then, go for multi purpose units which perform all the welding process and also perform welding and cutting. These units exists in six types such as powerultra 164, 185, 205 and powerpro 205, 226 and 256. Each unit has some maximum cut thickness and has rated plasma output and weld output and used in industrial, HVAC, repair, motor sports, fabrication and more.

Gavin Bone is an author for tig welder. He has written articles arc welding. For information visit our site Welder

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