photo (3)THE FUNDAMENTALS OF CENTERLESS GRINDING

 Basic Centerless Grinding– In the simplest terms, the centerless grinding process is based on the interplay of parts between two grinding wheels and the work rest blade. Parts are supported on the work rest blade, which is positioned between the grinding wheel and a regulating wheel. The positioning of the parts, wheels and work rest blade causes the grinding wheel to force parts downward against both the work rest blade and the regulating wheel. The movement of the regulating wheel causes the parts to rotate in at a consistent speed.

Thru-feed– Thru-feed is the most common type of grinding, used to grind straight, cylindrical jobs that have no heads or other projecting parts. Parts pass through the grinding and regulating wheels, which are set on a slight, and increasingly narrow, angle. This is a continuous process where single-diameter parts are are fed into the machine one after another in a straight line. The process removes excess material as parts pass through the wheels, resulting in the parts being ground to the desired diameter.Thru-feed is the quickest, and one of the most inexpensive, methods of centerless grinding. Parts with lengths varying from .300 to several inches long are good candidates for thru-feed. Parts run thru-feed can vary from .100 to several inches in diameter.

Running bar stock is simply an extension of the thru-feed process. Grinding bar stock on a centerless grinder uses the same concept of setting the wheels at an increasingly small taper to remove stock, passing the bars through the wheels to produce a consistent diameter for parts as long 20 feet.

In-feed– In-feed centerless grinding (sometimes called plunge grinding)is often the preferred method when parts have shoulders, heads or irregular shapes and projections that make thru-feed grinding impossible.Parts are fed manually between the grinding and regulating wheels, then the machine operator pulls a handle that causes the regulating wheel to approach the grinding wheel. The grinding wheel gradually removes material from the part.

In-feed grinding can deal with diameters from .080 in diameter to parts as large as 6 inches in diameter. Parts can also vary in length from .300 to as long as 20 inches. In some cases the part can exceed 20 inches in length, depending on the configuration.

Multiple Diameters– Grinding multiple diameters on a centerless grinder has become a serious money-saver for many King Centerless Grinding customers. Companies can save as much as 75 percent of their grinding costs by grinding parts on a centerless grinder that would have otherwise been done on an OD grinder. When diameter to diameter concentricity is specified on a print, most people assume that the job must be run on an OD grinder. However, we can help customers save money, while providing them with high quality parts and speedy turnaround times by running these parts on a centerless grinder.

Grinding With Fixtures– Our skilled staff always enjoys the challenge of working with unusual parts with strange configurations. Parts that require having diameters ground with non-cylindrical fixtures can be run on a centerless grinder.

Saving Time and Money with Centerless Grinding– Our customers often learn that we can save them money and valuable time, while successfully doing the types of jobs many other shops turn down as too difficult or are unable to do in a timely, precise and cost-efficient manner.Centerless grinders require shorter loading times than other methods of grinding, which increases the actual grinding time over other grinding methods. Once the operator properly sets up a centerless grinding for a particular job, the job can run with no further adjustment or additional setups. This differs from center type (cylindrical) grinding, which can mean substantial savings for our customers.

 

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