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How Do You Use Disc Magnets?

September 01, 2016

Disc Magnets are one of our most popular selling items, and each day we field questions about the material grade, coatings, and custom sizes of disc magnets, ring magnets, cylinder magnets, and tube magnets.  However, we don’t always know about the application due to the status of the application and the need for designers and developers to maintain confidentiality until a product launches.

Over the years we have consulted our customers about the “best magnet for their application”, and many times the shape of the magnet is a disc, ring, cylinder or tube magnet.  These round magnets have the ability to fit into, and onto, areas that other shapes can’t.  They can fit precisely into pre-drilled holes, sit nicely on steel rings, and can go into non-magnetic tubes easily.

Some of the main applications where you will find disc, cylinder, ring and tube magnets are in medical, sensors, motors, speakers, and holding applications.  Each application requires the magnetic field generated by a round magnet whether magnetized axially (through the thickness), or diametrically (across the diameter).      

We would like to know how you use round magnets.  Post your information on this blog so our wide spread customers in virtually every industry can gain insight and ideas from your experience.  From medical applications to motors, and magic to sensors, we look forward to hearing about your experience and allowing our customers to consider these magnets in their designs.

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  • [Reply from SuperMagnetMan]

    Yes, iron can be dissolved but it stays as a solid and is attracted to magnetic fields. It takes a much higher flux density to affect it. For example, in your engine oil, as the pistons, crankshaft and bearings wear, they flake off tiny particles that contain iron. Particles that are more than 100 microns in size tend to settle out in the bottom of an oil pan. As the particles get smaller, they become more thoroughly mixed and harder to separate. The surface tension properties of the liquid become stronger than the force of gravity trying to settle the particles.

    Many years ago, I set up an experiment with used engine oil. I had an oil analysis service that could give me a particle count profile of all the particles in iron and what size range they were. I took the same sample of oil and split it into two test bottles. One of them I did nothing to and the other one, I left on a 2 inch pyramid magnet over night upside down so it would pull all the ferrous particles to the lid. Then I turned it right side up and removed the lid with the trapped iron and put a new lid on and sent both off to be analyzed. The one that I used the magnet on had 0 particles remaining that were in the 100 micron size and 50 micron size. It had a little less than half as many in the 25 micron size range and the 10 micron. The 5 micron particle sizes were almost exactly the same in both samples.

    Hopefully that gives you an idea of the size range of particles and how they were affected by a 6,000 – 7,000 Gauss field.

    George Mizzell

    George Mizzell on

  • Can you dissolve iron into a liquid solution where the iron remains iron and can be attracted by a magnetic field? If this can be done, what would the shape of the iron become as it is attracted to the magnetic field?

    JR on

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