A rotary magnetic chuck is a device that is used to hold round workpieces, either hollow rings or solid ones, in combination with other machines to perform machining works. Since the surface of a rotary magnetic chuck that contacts the workpieces is magnetic, it allows the workpieces to be attached and detached on the device with no need of using other clamping machines to hold.
Depending on the principle of operation, rotary magnetic chucks can be divided into several types, including permanent magnetic chucks, electromagnetic chucks, and permanent electromagnetic chucks. The permanent magnetic types mean that the magnetism of them never lose, which is more energy-saving. While the electromagnetic chucks can only be operated when there is electrical current. When the electrical current is shut off, the magnetic field disappears.
Other types of chucks utilize more than one jaws to hold the workpieces in the center, while this requires the operators to adjust the jaws manually, which takes more time the stability of the jaws. However, magnetic chucks come without jaws, instead, they use the magnetic material on the top plates to make the workpieces be attached on the plates, which reduce the adjustment time. Although there are no jaws that provide the force to grip the workpieces on the rotary magnetic chucks, they are also capable of keeping the workpieces from dropping off by the strong magnetism and remaining accuracy of the works.
A rotary magnetic chuck consists of a base in the bottom, a top plate that is made of magnetic steel and nonmagnetic stainless and furnace brazed construction, and a handle that is removable on the edge of the base. With different types of rotary magnetic chucks, the formations of the poles on the plates are slightly various, including straight fine poles or radial poles in order to accommodate to different workpieces.
As for the rotary electromagnetic chucks, there is another type which is called concentric ring style. For general purposes, a rotary magnetic chuck is mainly used for grinding on lathes, cylindrical grinder, or rotary grinders. While the application would be a bit different depending on rotary magnetic chucks and rotary electromagnetic chucks. Since a rotary magnetic chuck comes with no jaws, there may be an additional parallel that is used to support the workpieces and helps set the workpieces in the desired position without deviation.
Without the requirement of adjusting the jaws on other types of chucks, the principle of working a rotary magnetic chuck is straightforward. A rotary magnetic chuck is usually set vertically, with the edge face parallel to the ground when rotating. One workpiece is placed on the top plate, and attached to it by the magnetism of the material that makes up the plate.
Now the workpiece is set between the rotary magnetic chuck and the other grinding machine. When the rotary magnetic chuck is turned on, it starts rotating the workpiece in high speed with strong force of magnetism that holds the workpiece stably. Then the machine on the other side is adjusted close to the workpiece and begins to grind the workpiece through the rotating of the rotary magnetic chuck. This is how a rotary magnetic chuck works.
A rotary magnetic chuck utilizes the polarity of ferrous work material to form magnetism. When the workpiece is placed across the poles of the magnet, the opposite polarity of the ferrous components and the magnet would accumulate the flux and make the workpiece be attached.
Depending on the shapes that make the magnetic chucks, they can be differentiated into two types, which are rotary magnetic chucks and rectangular magnetic chucks. A rectangular magnetic chuck is set horizontally on the table, with the grinding machine parallel above the rectangular magnetic chuck. While a rotary magnetic chuck is set vertically to the ground, and the grinding machine is parallel beside it. Another difference between these two types is the workpieces they hold. The rotary magnetic chucks usually hold round workpieces, either hollow or solid, whereas, the rectangular magnetic chucks are mainly used for solid workpieces.
Regarding the workpieces that the magnetic chucks are able to hold, they can be divided into rotary magnetic chucks and rotary electromagnetic chucks. The rotary magnetic chucks hold workpieces totally by the magnetism on the magnet, so they are often used for lightweight workpieces, which are suitable for small-scale machining works. However, the electromagnetic chucks own another source of force, which is the electrical current, thus, they are capable of holding relatively heavy-duty workpieces, which are more suitable for large-scale machining works.
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