Belt drives are also very annoying. Naming conventions are inconsistent and obtuse. Parts materials differ, and a whole lot of stuff seems to be custom.
in Servos and steppers, there are also weird mixes of metric and standard sizes - e.g. Nema 34 motors often have 1/2" (12.7mm) shafts with 5mm keyways. No idea why.
Finding gears or pulleys for my purposes has 100% of the time resulted in some machining and lathe work to take off the shelf parts and make them work for my applications.
in Servos and steppers, there are also weird mixes of metric and standard sizes - e.g. Nema 34 motors often have 1/2" (12.7mm) shafts with 5mm keyways. No idea why.
Finding gears or pulleys for my purposes has 100% of the time resulted in some machining and lathe work to take off the shelf parts and make them work for my applications.