Centerless grinder is a type of machining operation that utilizes an abrasive blasting disc to remove unwanted material from a workpiece without the use of a tool rest. Unlike other types of grinding that use a fixed workpiece and grinding wheels, the centerless design places the workpiece at the center of a rotating disc which eliminates the need for a stand. The result is an increase in speed and improved tool life. The grinding of a standard chuck can cause chatter and burrs and can also wear away the softer, more delicate parts of a workpiece such as welded pipes or gears.
Centrifugal force is utilized in the operation of a centerless grinder to completely eliminate the need for a chuck, providing a significant cost savings. These machines are typically powered by a direct drive motor that utilizes a clutch-like mechanism to hold the workpiece directly in place with no contact with the grinding wheels. Centrifugal force does not use electrical power, but instead requires the use of a continuous-running engine that is propelled through the action of sliding along a belt. These machines are ideal for precision surface grinding because the workpiece is always under the influence of the grinding wheels and the engine provides a steady, even pressure. Centrifugal machines have the ability to work in any position other than the fully enclosed and controlled environment of a chuck machine, making them suitable for applications where access to the work surface is limited.
Unlike a chuck machine, the cutting action of a centerless grinder can be directed by the operator. This feature allows operators to cut materials using a rotary motion in the stationary part of the machine rather than moving the workpiece towards or away from the grinder. In addition, this motion can be adjusted according to the type of work that needs to be completed. This type of machine can grind smooth metals, tiles, plastic, or a wide range of other items.
Although a centerless grinder is an excellent way to work on hard to reach areas, it does require some level of maintenance. Because the wheels are never attached to the machine itself, they are susceptible to damage from impact, rusting, and friction. Regular cleaning and lubrication of the moving parts of a grinder to ensure that these parts function at their full capacity for many years. Centerless grinder maintenance is similar to that of other types of grinding machines and includes removing the outer casings to expose the inner components, changing the oil and replacing the spindle, and taking any necessary steps to prevent catastrophic failure of the cutting wheel. Because of the sensitive nature of centerless grinding, it is especially important to perform these parts of the grinder maintenance process correctly.
One of the most common problems with centerless grinders occurs when dirt and debris are picked up from the grinding surfaces. This debris can seriously affect the performance of the grinding wheel, reducing its ability to create a sharp edge or produce a centered finish. To address this problem, take any dirt and debris and place it in a container in order to keep it from entering the grinding mechanism. If possible, place the container on the ground, and then back it up so that it can remain there until the dirt is removed.
A major problem that can occur with a centerless grinder is overheating. Although it is impossible to predict when the hot exhaust will occur, it is possible to control the rate at which the device heats up by changing the type of worktop used. By switching to a soft, cool-walled worktop, you can avoid overheating altogether, greatly extending the life of the grinding parts. The soft, cool-walled worktop will also require less energy to use because it won’t force the roundness into the worktop as much. This will save you money on electricity costs over the lifetime of the equipment.