One of the most important parts of an Angle grinder is grinder saw or the disc which helps in removing excess material or simply cut in to pieces. The various kinds of discs which help in achieving this are abrasive grinding discs, cut-off discs (diamond blade), grinding stones, wire brush wheels, sanding discs and polishing pads.
The grinder saw and the motor determine the overall output of the work. To get the maximum output, grinding discs which have appropriate backing, coat, and abrasive material should be carefully chosen.
For paint removal and fiberglass grinding, an open coat with durable fiber backing saw is used. Closed coat saw are made of aluminum oxide and fiber-backed, typically used for fiberglass, wood, and metal sanding. Fiber Discs are alumina zirconium mineral-based. Sharp, strong, and versatile, offer supreme debarring, weld grinding and blending, and metal removal.
The disc size is directly proportional to the power. Most common disc sizes are: 4, 4.5, 5, 6, 7, 9 and 12 inches.
Geometric setting is done to the grinder parts so that instrument functions best. The circular grinder saw must be tensioned to properly operate because when the saw comes to speed, the rim stretches due to centrifugal force. If they are not properly inserted, the saw will not move perfectly. They may move like a sauce pan ride. A saw that is to be run at higher speed will have to have more tension than one operated at slower speed. Hence while hammering the saw, the RPM to which it is going to be used and the power of the grinder should be well informed.
The grinder parts include inserted tooth blades which allow easy repair as they eliminate the need to regrind the gullets and swage the teeth. Also inserted tooth saw doesn't reduce in size as time goes by.
Sharpening of these saw is usually done periodically to have a precise cutting edge. It could be done manually like filing by hand or using some specific gadgets. Manual or machinery methods depend on the amount of sharpness required and material they are used with. Cutting is done by the teeth on the edge of the thin blade.
The grinder saw shows some marvelous characteristics such as straight and accurate cuts. Though there could be some blurs left on the cutting surface by the saw, mostly they have a good surface finish.
Waterjet cutting is a water-based cutting tool that is capable of cutting, slicing or carving several different types of materials in the industrial and commercial arena. A pressurized jet of water is forced through a small orifice to enhance its cutting capabilities. Materials up to 12" thickness can typically be cut using this method.
While some applications make use of pure water, there are some others where abrasive materials are mixed with water for better cutting capabilities. When the water-abrasive mixture is used for cutting, it is referred to as an abrasivejet. Abrasivejets are used primarily for cutting hard materials such as stone, metals or alloys. Other softer materials such as food, cloth, rubber, and paper can be easily cut using pure jets of water. In certain high-pressure water jet cutting applications, the water pressure could be higher than 60,000 PSI.
The advantages of Abrasive waterjet cutting technology
While it is true that this cutting method is simple in its properties, it is also true that it is the method needs to be handled only by professionals experienced in this technique. So, it wouldn't be wrong to say that this technology is advantageous only when it is in the right hands.
Here are some major advantages of cutting using water jets:
It is a cold cutting process, which means it doesn't need to make use of lasers or flames for cutting. This also means that there are no heat affected zones when you employ jets of water for cutting various materials.
With cutting methods such as stamping, laser cutting or sawing, the material being cut might get stressed, deformed or crushed. But water jets are so efficient and simple that they have no such drawbacks.
The finish rendered by this cutting method is so good that often there is no need for after-cut machining or finishing operations. This not only saves costs, but also saves a considerable amount of time.
Factors impacting the environment such as dust, fumes, and gas are a non-issue when you choose jets of water as a cutting medium. These jets are considered to be environmentally safe and sustainable cutting methods.
Most of the abrasive waterjet cutting systems available today can be easily integrated into existing production systems. So you don't have to worry about compatibility and upgrades to a new technology.
The accuracy, repeatability and precision of this cutting technique are among the best in the industry today. It can cut in multiple axes at very high speeds.
There are a myriad of materials that can be cut using a waterjet. These include stone, metals, glass, composites, fiberglass, plastic, wood, textiles, foam, meat, fruits and vegetables, and so on. Given all these apparent advantages, it comes as no surprise that more and more enterprises are increasingly switching over to this cutting technique.
Dust is not only something that the housewife wages war on; it is an unfortunate side-effect of many manufacturing and other processes and depending on what it emanates from can cause extensive irritation or even be toxic. For instance, the dust or smoke from welding stainless steel contains hex chrome which is toxic. Abrasive blasting of metal objects to prepare them for further finishes releases fine metal grit into the atmosphere that should not be inhaled -and those are just two examples.
Even mining and road works are known to produce dust from the dry soil that is moved around, while anyone involved in harvesting or storing grain of any kind - or processing it - will certainly know that it produces a great deal of dust. It is essential to minimize the dust in some way to prevent health problems.
To this end when such processes are in force it is essential for the company to implement measures that will take the dust particles out of the air so that the workers can remain healthy rather than developing a terminal illness, or even just suffering from unpleasant side effects such as skin and eye irritation, asthma or hay fever. Dust in the atmosphere can also cause accidents if it is heavy enough to reduce visibility in the worksite.
Since it is up to the company to provide a safe workplace, they can end up on the wrong end of litigation if they don't do something about the dust. Happily, there are many different kinds of dust collectors, from small extractors that can be attached to a single machine such as a woodworking lathe or thicknesser through to immense systems that facilitate dust extraction from a manufacturing plant. What is used for any application will depend on the amount of dust there is and what is causing it.
Smoke is also dust, only it is very fine dust that comes from something that causes heat such as welding or laser and plasma cutting processes. Dust can even be caused by moisture particles in the air from spray painting and chemical processes.
All these hazards must be dealt with if those employed in doing that kind of work are to survive and stay healthy. It is important that the right kind of dust collector be used; one that does the job efficiently; is made for the kind of dust that is present and is big enough - or indeed, small enough - for that particular job. Once the dust is dealt with business owners can have peace of mind that their company will not go under due to litigation.
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