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How Fans Work

Fans have a rotating arrangement of blades that move in a propeller motion.  These blades are angled to trap air and because the fan is static the air is moved forward rather than the device.  Most fans are powered by an electric motor and some are even designed to work off a USB port on a computer.  Fan blades are safely contained in a housing or case.  This casing helps to direct airflow and will also prevent objects from touching the fan blades as they are in motion.

Fans are used in a number of applications in the business world.  This can range from the basic electric table fan which is used to improve cooling in office environments to large scale fume extraction units used in the chemical industry.   

Mechanical Fans

These fans are the most common type available and are manufactured in a wide range of designs.  You can find mechanical fans in a number of business applications from air conditioning systems through to computer cooling.  Mechanical fans are also used in motor cars, hair dryers and heating units.  These fans can be grouped into three main types:

* Axial Fans – Axial flow fans have blades are specially angled to force air to move parallel to the main shaft.  This means the air flows directly along the axis of the device.  This type of fan is used in standard desk top cooling fans and also computer cooling fans.
* Centrifugal Fans – centrifugal fans have a moving component that rotates. This means air can be directed out of an opening at greater pressure.  This produces a much faster airflow which is useful for devices such as blowdryers, climate control and leaf blowers.  Centrifugal fans are typically a lot noisier than axial fans.
* Crossflow Fans – these are also known as tangential or tubular fans.  They are commonly used in the HVAC industry as they are efficient at producing high pressure.  These fans are longer than their diameter and this causes three distinct air flow systems, the through flow region, eccentric vortex and paddling region.  Crossflow fans draw air inward and then move the air outward in a radial direction. This is allows the fan not just to create air flow but also to dissipated gases as well.

Bladeless Fans

Bladeless fans do actually have blades but these are hidden away in the lower compartments.  The main body of the fan disperses the cooled air through a ring structure which contains no blades, which gives these devices their name. These can be very efficient ways of cooling and improving air flow in confined spaces.

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Gas struts (or gas springs) control the lifting and lowering of lids, flaps, hoods & safety guards, thus reducing manual effort and forces. With controlled extension & compression speeds, gas struts have high force capability in an extremely small package. Many gas struts are designed to be used in an industrial environment and have the added advantage of being maintenance-free and self-contained – you will find a variety of gas struts including adjustable or fixed force gas struts in catalogues of major suppliers.

Different Types

There are many different types of gas struts or springs;

* Click and go
This is a lockable gas strut which requires only one touch to fully extend automatically.
* Aluminium gas strut
These are over 50% lighter than other gas struts of the same type – they’re great because they are extremely strong and are highly corrosion resistant.
* Telescoping gas strut
This is a standard gas strut or spring that offers twice the stroke of similar springs at a minimal compressed length. How? Due to the fact it can ‘telescope out’.

These are just 3 of the many different types of gas struts you can purchase from a respected manufacturer and distributor.

Choose Carefully

Interested in purchasing gas struts? Make sure you choose the company you deal with carefully. There are one or two companies that will provide you with poor quality, and you can probably tell by the ‘too good to be true’ price! Always (as with anything you purchase) do your research first – make sure the company you’re dealing with has a proven track record of supplying automation control equipment and can be contacted easily, with an address, phone and email readily available(preferably all 3).

Many Uses

Gas struts are used in almost everything! From Formula 1 (operate the main valve) cars in the automotive industry, to the furniture, building and medical industries – gas struts are a vital tool in everyday life.

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The same applies to anyone looking to lose weight with electronic muscle stimulator use. While the stimulator may help to alleviate the pain sometimes associated with weight loss exercising, the unit itself will most likely have very little to do with actual weight loss. However, by helping the person control any pain associated with the exercising, the stimulator may, in fact, help these people to exercise more. They will then have a better chance at losing more weight.

Electronic muscle stimulators have been thoroughly proven to help with physical therapy where nerve and muscle damage has occurred. Many therapists highly recommend the use of these units when their patients routinely complain of sore muscles during and after exercise workouts, or have some form of nerve damage that prevents them from getting the most out of life.

The effective use of these electronic muscle stimulators depends a lot on the type of patient and the nerve or muscle damage they may be suffering from. In general use, the stimulator units can be used easily by the patients themselves after only a few minutes of training. In this way, the patients control the amount of voltage used and the rhythm cycle that controls the rate of muscle contractions. Many health spas and gyms have electronic muscle stimulators on hand to help alleviate any sudden pain or muscle spasms that their customers may have while exercising. It’s fairly easy to become adept at using these units and many people swear by the relief that these units give them from their muscle and nerve pain.

Many manufacturers of these electronic muscle stimulators are quick to point out the safety and value of their products when it comes to weight loss or muscle building. How would a company stay in business if it didn’t promote its own products? Many federal departments have done exhaustive tests on these electronic muscle stimulators and have found that very few of them do anything at all in the way of weight loss. The results from using one of these units for weight loss is comparable to not using one at all, proving that the units are ineffective at best. In fact, they may end up being harmful if overused to stimulate out-of-shape muscle and fat tissue. Because the stimulators contract the muscles, many people believe that this motion causes the body to lose weight, but it is simply not true.

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CNC Milling Machines have been programmed with the help of a set of commands called G-codes. These codes are special CNC functions in alphanumeric format.

The cutting tool is usually rotated along the axis, which is perpendicular to the table where the material to be cut is placed. There are different cutter shapes (called milling bits) such as round (ball end), square, and angled.

Advantages of CNC Milling

A large variety of 2D and 3D shapes are possible. Complex shapes from rod, block, or sheet material can be created and is cost effective for short runs.

Specifications for CNC Milling

• Rigid materials such as metals and hard plastics are used.

• Alternative machines for 2D sheet shapes that include Laser Cut, Turret Punch and fixed punch are used.

• CNC Milling requires software program tooling or work holding jigs.

• To contain costs avoid large variations in work piece height and avoid thin walls.

The CNC Machining centers are computer controlled vertical mills which can move the spindle along the Z-axis. When the machine is used in combination with conical tools or a ball nose cutter it improves the milling precision without affecting the speed thus providing an economical substitute to flat surface job that requires hand engraving.

During the milling process pressure is applied to the material therefore it is better to avoid weak shapes, long thin shapes, or ones with thin walls. CNC milling offers a cut surface that has a visible pattern due to the rotation and movement of the cutter.

eMachineShop offers you information about a vast number of products and machines and CNC Milling machine is one of them. A unique online CMC provider allows you to design and even order custom CNC machined parts. Visit the site www.eMachineShop.com to get details about these and other services. While you’re there, don’t forget to download the company’s free 3D CAD software which makes designing CNC milled parts a snap!

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