New Bespoke Wire Cut Neodymium Magnets

To meet increasingly complex customer’s requirements, Bunting has developed a manufacturing process to supply bespoke wire-cut neodymium magnets.  The magnets are tailored to suit the specific project specifications in terms of magnet grade and dimensions.  With bespoke wire-cut magnets, prototyping time is reduced prior to the production of volume parts.

Optimum Magnet Specification

Bunting’s magnetics engineering team work closely with designers in the specifying the type, grade and size of magnet for any given application.  This product development design phase often involves building prototypes, which may include magnets of a specific grade and size not available from stock.  The bespoke wire-cutting service ensures the optimum sizing of the selected magnet.

At present, bespoke wire cut magnets are available in four high-performance grades, where the higher N number relates to the strongest magnet.  The four grades are:

• N56M
• N48SH
• N45SH
• N42UH

Magnet Protection

Uncoated neodymium magnets are brittle, oxidise in oxygen, and can corrode.  The majority of neodymium magnets are coated to provide protection against corrosion and damage, whilst also extending the life of the magnet.  Two coatings commonly used are Expoxy and Everslik. 

Epoxy resin is an adhesive used in a range of industries and applications and provides toughness, chemical resistance, and strong adhesion.  Everslik is a thermally cured Epoxy based barrier coating.  The coating provides excellent chemical corrosion resistance and is able to withstand chemical substances including Sulphuric Acid, Nitric Acid, Trichloroethylene, and Hydrochloric Acid.

Bespoke Wire-Cut Magnets

Matthew Swallow, Bunting’s Technical Product Manager, explained the reason for the new bespoke wire-cutting service:

“The increase in the range of applications requiring specific high-strength magnets has led to a high demand for bespoke-sized magnets.  Being able to wire-cut neodymium magnets to suit a specific size significantly reduces the development time.  This also provides an opportunity to assess several magnets of different sizes at one time.  Ultimately, this means that the whole design process is shortened and production scale manufacturing is possible much earlier than previously.”