Marcus Aurelius wrote:[XAP]Bob wrote:Marcus Aurelius wrote:
Not quite. Any disc with teeth on it is a cog, the terms ‘sprocket’ and ‘ring’ just refer to the function and position of the cog.
A cog has teeth that mesh with those of another cog or worm gear etc. A sprocket’s teeth meshes with a roller chain.
They are different.
Cog can also refer to the individual teeth on a cog, and could stretch to those on a sprocket as well, but the whole round thing is a sprocket, not a cog.
Yes - those were taken from the OED.
You are taking colloquial usage as truth, which on technical matters is just wrong.