Due to their small size and light weights, they react strongly to residual magnetism. Special attention must therefore be paid to the handling tools, the production machines and the clamping elements.
Injection needles in medical technology are handled in containers of several thousand items during production. In order to perform further production processes on the needles, it must be possible to separate them. Residual magnetism can interfere with this process, as several needles remain stuck together when handling or separating.
As with cannulas, spindles react strongly to magnetism due to their stretched shape and can also generate strong magnetism themselves. These parts are normally made of high quality and hard ferromagnetic materials. These materials can have the virtual properties of permanent magnets.
Forming the spring wire causes changes in the material. These changes have the property of causing the springs to become magnetic and allow magnetism to develop
Springs and balance springs made of silicon are also available on the market. These springs do not have any magnetic properties and are therefore paramagnetic.
When assembling precision parts in the watch industry or micro technology, even the smallest magnetic fields cause interference, as the parts remain stuck on the tool or stick together when separating.
Clock and watch movements
Clock and watch movements can be magnetised by small magnetic fields. This magnetisation causes increased running inaccuracy, usually resulting in running fast due to the magnetised balance spring. Proceed with caution when performing demagnetisation on complete watches. The high quality Tourbillon movement is the most sensitive, whilst the quartz movement is the least sensitive. These do not generally have problems with residual magnetism.