As an important accessory of the dial indicator, the stability of the magnetic holder directly affects the accuracy
of the measurement. In this article, we will discuss the working principle of the magnetic holder of dial indicator,
and how to achieve stable fixation, so as to ensure the accuracy and reliability of the measurement results.
I. Working Principle of Magnetic Holder
1. Magnets have north and south poles, same sex repel, opposite sex attract. The core component
of the magnetic holder is a permanent magnet, which can produce strong magnetic force.
2. This permanent magnet is usually wrapped in a metal shell, there is a switch device at the bottom of the shell,
used to control the size of the magnetic force, or to control whether the magnetic force acts
on the adsorption surface.
3. When we turn on the switch, the magnetic force will pass through the metal shell, firmly adsorbed on the surface
of ferromagnetic materials, such as steel parts. This achieves a stable fixation of the micrometer.
II. How to achieve stable fixation?
1. Choose a suitable adsorption surface: The adsorption force of the magnetic watch holder
is closely related to the material of the adsorption surface, surface finish, and the size of the contact area.
Choose a flat, smooth, and large enough ferromagnetic material as the adsorption surface.
2. Clean the adsorption surface: adsorption surface of oil, iron filings and other impurities will affect the size
of the magnetic force, so before use, be sure to clean the adsorption surface to ensure that it is clean and dry.
3. The correct operation of the switch: Before use, to ensure that the switch is open, so that the magnetic
force to give full play to its role. After use, close the switch to prevent the magnetic watch holder from adsorbing
other ferromagnetic substances and affecting its service life.
4. Adjust the angle of the table base: Some magnetic table base with universal adjustment function, you can adjust
the angle of the table base according to the need, in order to adapt to different shapes of the workpiece.
After adjusting the angle, make sure the locking device is firm to prevent the table base from moving
during the measuring process.
III. Different types of magnetic holders
1. Ordinary magnetic base: This is the most common type, simple structure, easy to operate,
suitable for general measurement occasions.
2. Fine-tuning magnetic base: This type of table base with fine-tuning mechanism, you can make small adjustments
to the position of the micrometer, improve the measurement accuracy.
3. Strong magnetic base: This type of table base adopts strong magnet, stronger adsorption,
suitable for heavy workpiece measurement.
IV. Maintenance of magnetic holders
1. Avoid collision: The permanent magnet in the magnetic watch holder is relatively fragile, avoid collision,
so as not to damage the magnet and affect its adsorption.
2. Keep clean: The magnetic watch holder should be cleaned regularly to prevent iron filings, oil and other impurities
from adhering to the surface of the magnet and affecting its performance.
3. Away from high temperature: High temperature will affect the magnetism of the permanent magnet,
so avoid placing the magnetic watch holder in a high temperature environment for a long time.
V. Tips for buying and selling magnetic holders
1. According to the measurement needs to choose the right type: For example, when you need high-precision
measurement, you can choose the fine-tuning magnetic meter base; when you need to measure heavy workpieces,
you can choose the strong magnetic meter base.
2. Pay attention to the size of the magnetic force: The size of the magnetic force determines the adsorption force
of the table base, according to the weight and shape of the measured workpiece to choose the appropriate size
of the magnetic force.
3. Choose a reliable brand: Reliable brand usually has better performance and longer service life.
