Hey hello I have a six axis gyroscope drone....
Itvwas working perfectly until....one day one of its gear stopped rotating... I don't know what to do...plzz help me....
I need to know how to repair it.... Or if there any service centre in chennai...
Plzz  help...

It would make sense to post some details including pictures and model numbers of whatever it is that you are talking about.

To put things in perspective, your post above is a bit like "I have a car which does not start any more, please help" !  How can someone help without knowing what type of car it is, what do you see or what happens when you attempt to start it etc.

I am sure this is because of your inexperience in posting in forums like these, so no big deal Many people here can help, as long as you ask the right questions with at least basic information needed for troubleshooting.