Multi beam couplings
are designed to readily support a combination of angular, axial, and parallel misalignments. But you should always use the multi beam with extra caution when targeting low bearing loads. Multi beams are constructed using three standard materials, acetal, aluminum, and stainless steel. The multi beam uses the flexible beam principle, which in the simplest form has a helical slot incision into a cylindrical section. Flexure is achieved via three start beams that provide misalignment compensation just like the single beam
couplers, but has an advantage of low radial loads and higher torsional stiffness. You should consider going for multi-beam couplers when you are dealing with light-duty power transmission applications like servo motors and steeper motors
. They are also suitable for precision applications especially those that involve components like tachogenerators and encoders. Multi beam couplers can be bought with or without relief. It is very important to ensure that the coupler remains flexible if the driver/driven shaft extend under the beams relief. However, when non-relieved versions are used, it is important to ensure that the shaft does not penetrate under the beamed part of the coupler.