Q&A
Electro permanent magnetic chucks are more energy-efficient than conventional electromagnetic chucks mainly because of differences in their internal construction.
A conventional electromagnetic chuck uses wound coils and requires the controller to continuously supply electrical power in order to maintain magnetic holding force. Once power is cut off, the magnetic field collapses and the workpiece is released.
An electro permanent magnetic chuck, on the other hand, contains coils, Neodymium magnets, and special magnetic materials that retain magnetization. Electrical power is only required for a few seconds during magnetization and demagnetization cycles. During machining operations no continuous power is required, so overall energy consumption is significantly lower.
In actual machining applications, both electro permanent magnetic chucks and conventional electromagnetic chucks have their own advantages and limitations. For a more detailed comparison, please refer to the section on “Pros and Cons of Electromagnetic and Non-Electric Magnetic Chucks.”
First, to find the material of the workpiece.
Second, to find that the workpiece is too small or not. If it is too small, it needs to be fixed with a jig or a guide block to increase the resistance.
Third, to check the chuck controller, whether the fuse is burned, the power input and output are normal or not.
First, please check that the AC input power is connected and the voltage is correct or not.
Second, to check that the cable of electromagnetic chuck is disconnected or broken.
Third, please check the switch, display and fuse of chuck controller are normal or not.
Fourth, to operate the chuck as the user’s instructions.
Generally, if one dimension of workpiece is larger the length 100mm, width 50mm and height 20mm, it is available to use the electromagnetic chuck with normal pole pitch.
Or, the smaller and thinner workpiece needs to use a smaller pole pitch or fine-pole or fine-line electromagnetic chuck.
Generally, it is available for iron but it will directly affect to hold/keep the special steel or high carbon steel and stainless steel materials.
It needs to take comprehensive considerations based on the characteristics of the workpiece (size, shape, material), processing methods and machine types, etc. Welcome to contact our company and we will find the most suitable magnetic chuck to you.
For chucks with the same size and design, the power used (in watts) is the same. The difference is that low-voltage chucks need more current and have higher inductance. Because of this, when the magnet turns on, the magnetic force builds up faster, so it can hold the workpiece a bit better at the start.
About the Author:
Yu-Chih Chiang is the engineer, sales representative at Guang Dar and has over 10 years of experience in mechanical engineering. Follow Yu-Chih on LinkedIn.
The answer is no. Based on the nature of magnetic force, magnetic field lines have a certain height. When the workpiece is too thin, these magnetic lines can pass through it, meaning much of the magnetic force cannot effectively act on the workpiece itself. As a result, the holding force may be significantly reduced. Therefore, a workpiece with a certain minimum thickness is generally more effective, as it allows the magnetic field to be concentrated within the material instead of leaking through it.
In addition to thickness, several other factors affect magnetic holding performance—such as the material of the workpiece, the flatness of the contact surface, and the surface area in contact with the chuck. To optimize holding force, different types of magnetic chucks are designed for various applications. These include chucks for milling (heavy-duty cutting), grinding (light-duty cutting and grinding), coarse pole chucks (with wider pole pitch), fine pole chucks (with narrower pole pitch), and other special-purpose magnetic chucks.
For any questions regarding magnetic holding or the selection of suitable magnetic chucks, please feel free to contact Guang Dar Magnetic Industrial Co., Ltd. We are happy to assist you.
About the Author:
Yu-Chih Chiang is the engineer, sales representative at Guang Dar and has over 10 years of experience in mechanical engineering. Follow Yu-Chih on LinkedIn.