Centerless Grinder is an important part of many types of metal fabrication machining. This type of machining utilizes a rotating diamond-tipped tool to cut through any material and it can be a very effective method of cutting thick, heavy materials such as sheet metal, aluminum, copper, brass and stainless steel. Centerless grinders are commonly used in CNC mills. This article will take a look at what this type of grinder is and what it does.
Centerless grinders are used in CNC mills as part of the workholding system. The workholding system consists of two or more workpieces that are moved by a continuous conveyor system through a table or some type of similar support. In order for the workholding to operate effectively, the centerless grinders must be able to keep a constant bearing contact with both of the workpieces and the table/support.
To control the speed of the grinding machine and the length of the grinding operation, the workpiece is placed on a spindle positioned at the center of the chuck. There are a number of different types of grinding machines. Some of the most common centerless grinder designs use a single, two, or three stage direct drive motors. A high pulley system is also used with these types of machines. High voltage drive systems can also use a belt drive, which is much quieter and usually has a better warranty than the motors that use a single stage drive.
The most common design for a centerless grinder uses a one piece, sealed cartridge assembly. This assembly consists of a grinding wheel and a bearing. The bearing is fitted to the top of the wheel spindle and the wheel fits into the housing. To control the speed of the grinding process, a variable number of teeth will rotate either inside the housing or outside of it. The outside housing can be opened and closed during the grinding operation to change the direction of the grinding wheel. By increasing the revolutions per minute of the grinding motor, the work piece can be moved further along the vertical axis.
To prevent slag build-up and ensure that all parts of the workpiece are in contact with each other at all times, the bearing and housing must seal tightly. High performance Centerless grinders use heavy duty seals made from precision CNC machined aluminum. This type of seal is highly resistant to the buildup of slag. This allows the bearings to spin smoothly without the interference of slag. This is especially important when using abrasives with hardening properties.
There are many applications where a centerless grinder can be a practical solution. In general, they are preferred over throughfeed grinders because the inside of the workpiece does not need to be protected from abrasive particles by the edges. They also have much smoother motion and produce finer particles. For this reason, centerless grinders are much more suited to abrasive applications than are throughfeed grinders.