Mechanical Finishing Finds Several Uses

Mechanical finishing finds several uses and involves cleaning, deburring and polishing parts particularly metal ones. Tumbling barrels and vibratory machines are used for this reason. Barrels are ordinarily horizontal and the vibrators are in the shape of tubs. It is possible to load the parts to be finished and the mass finishing media into these machines collectively. These are equipment which are moved in several precise ways to make the media and the parts to graze against each other thus causing an abrasive accomplishment which in turn cleans or polishes according to the prerequisite. Sometimes, to make sure that re-depositing of the deburred parts does not take place, several chemical compounds are also added to the machines.

The machinery come in different models like those that can be mounted on to tables and those that are installed on the floor. Both dry and wet finishing can be done. In the tumbling barrels the abrasive materials are pushed or slid to achieve the necessary finish. In vibratory tubs the media are moved about more tenderly. Therefore while tumbling barrels are ideal for heavy deburring and cutting operations and for tiny components, while the vibratory tubs are used to carry out gentler finishing requirements on larger manufactured parts. For some requirements like cleaning, deflashing, stripping etching etc, blasting machines are also used with blasting media which range from super fine to super coarse, for tender to aggressive requisites.

The media used can be ceramic, plastic, chemical or organic. Plastic media is ideal for gentle polishing and in cases where the parts involved are frail. Plastic weighs a great deal less when compared to ceramic; it is easier on the natural environment when compared to chemicals and it is much more robust when weighed against organic media. When the parts to be finished are prepared of soft metals like aluminum or fragile materials like fiberglass, the only means to achieve optimum and damage-free results is by using media that are made out of plastic. This particular media finds very detailed usage in the airframe components/ structures maintenance.

Plastic polishing media are admired for multiple finishing operations. Each requirement needs the media to be made from a precise kind of material and have a certain shape and size. To meet all requirements, these abrasive items come in different plastic types (each having a dissimilar thickness), a variety of sizes like cones, cylinders, triangles, round, oval and so on. Sizes too vary from very small to very large ones. The plastic media are commonly available in mass quantities. For some purposes a single shape and size will be enough. For others various shapes and sizes have to be taken together throughout the finishing process. For instance in the case of a part that has a basic surface, plastic media in just one shape and size should suffice. But in the case of a component that has a surface with many dents, holes etc - each of which desires to be cleaned or polished - the tumbling-media has to necessarily take account of a whole variety of shapes and sizes.

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Using Finishing Machines For Mass Finishing Of Parts

Mass finishing is a terminology used to define the procedure of deburring, cutting, smoothing, polishing, cleaning and separating of parts as a group. This method involves the loading of parts to be finished into finishing machines like the tumbling barrels, vibratory machines and centrifugal barrel machines. Along with the parts, finishing media and/ or finishing compounds can also be loaded with or without water. Once the finishing machines starts execution, the parts graze alongside the media at the same time as being suspended in the finishing compounds. The media and compounds have coarse properties which cause the excess metal (or any other material with which the parts are made) to be abraded away.

The method of mass finishing might use tumbling machines that are barrels which are made to spin or vibratory machines which are tubs that vibrate at very high speeds with short strokes. The finishing media used may perhaps be natural media like the corn cob media and walnut shell media or non-natural media like plastic deburring media and ceramic media. While natural media supply soft abrasive action on the parts, the artificial media are used for intermediate to heavy deburring. Plastic media being lighter compared to ceramic media are used with delicate and fragile parts while the ceramic media is used with heavy loads that necessitate cutting. They come in all sorts of shapes to deal with different sizes and patterns in the parts being completed like conical, pyramidal, cylindrical, triangular and so on.

Finishing compounds are used in the mass finishing procedure to increase media effectiveness. They give further abrasive property and more cutting power. They inhibit glaze formation in the loads so that the media can work better on the parts. These compounds could have alkaline or acidic properties and come in the liquid, powdered or cream forms. When cleaning of parts is needed during the mass finishing, compounds come in very handy. They are good cleaning agents that can degrease, de-scale and de-oxidize. They can also be used to impart properties like anti-rust and anti-corrosion in the parts by using certain chemicals especially for this purpose.

Centrifugal barrel machines are finishing machinery used in finishing of parts. They characteristically have one or more barrels mounted on turrets. These barrels are prepared to rotate at very high speeds so that the principle of centrifugal force comes into play within the barrels. The load within the barrels is thrown to the walls of the barrel because of the centrifugal force that acts on them at the barrel center. The parts and media that have been put together thus rub with each other constantly at a very high rate of speed producing the preferred deburring and cutting action.

The centrifugal barrel machines take less time to finish parts as compared to customary barrels or vibratory machines. They have safety latches to keep the loads safely inside when rotating. They are easy to load and unload. Centrifugal barrel machines come in different capacities, different horse power for motors, electrical powers and shipping weights to suit different finishing operations.

Grav Co LLc - Metal Finishing Equipment

Grav-i-Flo Corporation, manufacturer of Grav-i-Flo & Torex Finishing Equipment, has become Grav Co LLC

STURGIS, Michigan
800-521-5793 Toll Free
269-651-7110 Fax

As of July 1, 2006 the Grav-i-Flo Corporation is no longer in business. Grav-i-Flo has been purchased by a group of local investors and is now Grav Co LLC. David Scheetz is principal owner and CEO and Robert Summey is Sales manager. These two together bring over fifty years of metal finishing experience to Grav Co LLC.

Grav Co LLC will continue to manufacture the finest mass finishing equipment and supplies in the marketplace. We will still build vibratory finishing, disc finishing, high speed and low speed barrel finishing, and spin finishing equipment in our Sturgis, Michigan plants. We also manufacture vibratory finishing media, treated cob meal and various liquid and powder compounds, and have a very good line of ceramic finishing media.

The trade name Grav-i-Flo has been synonymous with quality metal finishing equipment and supplies for over forty years. Under our new management we will be taking the company to the next level in quality and service. We will be able to provide you a quote on standard equipment, and supplies in one day or less. We plan on shipping most supply orders in one to two days. We will be a world class supplier of finishing equipment and supplies.

New Products

A new product line currently on the drawing board is standard parts washers. We are building a cellular style belt and rotary drum washers. If you have a parts washer project currently that you think a simple belt or drum washer will suffice, we build a very good washer at a very competitive price. Try us, I think you will like the products and the new management team. Let us help you resolve your finishing needs.