Q: Can these magnets be machined to size in a lathe without damaging the magnetic field?
Any ex-factory modification to our Neodymium magnets is not recommended and will void any obligation for Frenergy to replace a faulty magnet.
Most non-flexible magnets are mechanically quite brittle and do not easily tolerate vibration, abrasion or mishandling. Any damage to a magnet usually results in either a partial or complete loss of magnetic power. Neodymium magnets are not designed to be machined or altered and the correct size magnet should be chosen in order to match your application precisely and without alteration. Modifying a Neodymium magnet by grinding or machining the surface will compromise the protective Nickel coating on the magnet and make it more vulnerable to damage.
Some Frenergy customers have lightly sanded the nickel coating with fine sandpaper to create a better bond when the magnet is attached to another surface with glue, however, we do not regard this as necessary and cannot recommend this treatment. Ferrite magnets can withstand a small amount of modification from grinding but in most cases, they will also incur a degree of increased structural fragility and reduced magnetic power.