Useful Information About Machining (small milling machines)

Machining in the industrial context of small mining machines refers to the use of power driven machine tools to shape metal. Metals are cut using various advanced small milling machines and hence the process is often referred to as metal cutting (machining).

Machining has various categories such as grinding, milling, turning, and drilling. In addition advanced technology has been developed to cut away material using electricity, chemicals, lasers, and water.

For grinding, a grinding belt or wheel is used, which is chafed against the work piece to remove material, for which water is used to avert the grinding wheel from getting hot and creating sparks. Grinding is often used for cutting metal pieces that are too hard to be machined.

However for cutting work pieces into asymmetric shapes, a manual machine would be an ideal aid. The process of manual machining is called as milling, and is good for general machining. However the milling process is less accurate, and not preferred as much as the turning or grinding machining process. The milling machine resembles a drill press, and the cutter looks like a drill bit that goes downwards in the piece to be cut. There are various different kinds of milling machines, and all serve in setting the depth of the cut.

Turning is another machine cutting process. However, the turning machining has a very unusual process of cutting, which is done on a lathe. Wherein the lathe turns the piece around, as a blade cuts away the required portion of the material.

Similarly drilling is a very common process of machining, which is used for cutting. The drilling process involves use of a drill or a drill press that has a drill bit on it, to cut away the work piece. Drill bits are available in many sizes and shapes, which help in cutting intricate shapes.

Nontraditional methods are also used for machine cutting such as a water jet technique, which is mainly used to cut softer materials, or materials that have cracks. Similarly the electrochemical machining technique is used for precise cutting. More over the advances in the machining process has been very crucial in the growth and development of the manufacturing sector.

Machining provides detailed information on Machining, CNC Machining, Casting Molding Machining, Precision Machining and more. Small milling machines is affiliated with Automotive Machine Shop Services.

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Graphite and Its Effects on the Human Body and Tool Room Equipment

The health and welfare of toolmakers that use graphite to make electrodes for use the EDM machining of molds should be a high priority for management. In addition to the health issues for the workers, the very expensive machinery, such as the EDM machines and milling machines, must be protected from the damaging effects of graphite dust. EDM and injection molding are inseparably linked in the manufacturing process of plastic products.

Anyone who has worked with graphite in the manufacturing of EDM electrodes is keenly aware of the need for proper dust removal during the machining process. Many ill-equipped shops have very little equipment to handle the dust generated during milling and grinding operations.

Safety

The MSDS (material safety data sheet) for the synthetic graphite used in EDM show that there are no carcinogenic properties associated with graphite. It is a chemically inert material and contains no volatile components. It is also used for medical purposes, such as implants and heart valves in the human body.

This is not to say that graphite is totally harmless though. It can be very irritating to the skin, eyes, and nasal passages. It can cause stinging, redness and watering of the eyes, and itching of the skin. This can be a very annoying experience when a toolmaker is expected to produce a close-tolerance electrode with a fine finish.

Controlling the Dust

The simple but very ineffective solution is to wear particle masks. Experience shows that this stop-gap measure is a failure. The mask soon is clogged with the fine dust and the operator is left breathing a disgusting blend of bad-breath and graphite dust!

Portable vacuums are the next best solution, but this also has many drawbacks. Often the filter in the portable shop vacuum is not fine enough to trap the microscopic sized particles, and they are simply blown back into the air. Also, because the vacuum hose is often cumbersome to manipulate, operators fail to properly align the hose to capture the most dust.

Many shops use a centralized vacuum system designed for the removal of fine dust particles, such as graphite. It is important to have enough air velocity in the vacuum system to be effective. It is recommended to have an air velocity of 500 ft. per minute and the air in the lines should travel at a rate of 2,000 ft. per minute in order to prevent the dust from settling inside the duct work.

With a centralized system it is much easier to efficiently manage the dust from the various machine tools because the system is more efficient and the hoses can be strategically placed. Special wheel guards are available for surface grinders that act as a turbo to remove the dust into the vacuum system.

Newer milling machines which are more or less dedicated to electrode machining are equipped with extremely effective dust removal systems. The sealed chamber around the work area enables the vacuum to capture a high percentage of the dust. This development has dramatically reduced the amount of graphite dust in the shop environment.

An additional method of dust removal is the use of a curtain of coolant surrounding the milling cutter. This prevents the dust from ever escaping and is very efficient. This feature is available on some milling machines as well as an accessory that is easily installed.

A Clean Shop Environment

Graphite dust is highly conductive and has been responsible for the damage of many expensive tools and machines. Glass scales can give false measurements due to the settling of dust. Electronic equipment can be short-circuited by the dust as well. The grimy nature of graphite makes it especially annoying if it accumulates on work-benches and desks.

It is in the best interest of everyone to make every effort of maintain a clean and pleasant atmosphere in a moldmaking or EDM shop. The toolmakers will be happier, the work will be better and the machinery will perform as it should. It is also very impressive to visitors to see a clean, dust-free shop.

If you haven't already done so, 5S process implementation should rank high on your list to organize your shop!

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