what does this sentence mean?

Definitions of cog on the Web:

• roll steel ingots
• a subordinate who performs an important but routine function; "he was a small cog in a large machine"
• join pieces of wood with cogs
• tooth on the rim of gear wheel
  wordnetweb.princeton.edu/perl/webwn

http://www.thefreedictionary.com/cog

Hi Friends,

Thank you for all your help! I have guessed the same meaning as you offered but just was not sure.

I should have known that the "k" in the front of an English word is usually same as "c" and "k" is offen used in German words.

So the client mistook "cog" as "kog".

Thank you very much!

B/Rgds.

If he told you this in writing, he misspelled the word.

If he told you orally, you misspelled the word.

The correct word sounds exactly the same, and appears in dictionaries.

Good Morning,

A kog is the one tooth on a gear. so what he is saying is, I lost a tooth on my gear and it is now stuck

There is a gear box on a wind turbine and I believe he is saying that the gear got stripped and the output shaft stopped while the wind turbine blades kept turning with the wind. The blades ot the turbine do not turn at syncronous speed required for generation so a gearbox is required to match the system speed.