Oldham Couplings

An Oldham coupling is a mechanical connector used to join two shafts that are parallel to each other but slightly offset (misaligned).
Here is the simple breakdown of what it does:
• Three Parts: It has two hubs (one for each shaft) and a flat middle disk with a slot cut into each side.
• The Sliding Disk: The middle disk slides back and forth in the slots as the shafts turn. This sliding action makes up for the offset distance between the two shafts.
• Keeps Speeds Same: Unlike some other flexible couplings, an Oldham coupling always spins both shafts at exactly the same speed without any variations.
• Protects Machinery: By absorbing the parallel misalignment with its sliding disk, it prevents stress from damaging the connected motors and bearings.
• Needs a Little Grease: The sliding surfaces often need a little grease to work smoothly and prevent wear.
In short, an Oldham coupling is a precise, sliding connector used specifically to link two shafts that are perfectly parallel but slightly too far apart from each other.