I'm not sure what you mean...I keep the same chain on the saw until it's worn out,then I just throw on a new one..I can tell what kind of filing that needs to be done by looking at it and/or cutting with the saw...The only thing I have a hard time keeping up with is several different people will run the same saw in one day.A couple of my guys will absolutely not run a dull chain,while the others will try and cut no matter what kind of shape the chain is in.
I cut and haul more wood and remove more trees in a week's time than alot of people on this site can even imagine.During my busy season,I spend lots of time,8 to 12 hours a day behind a saw.After many years of doing just that,you really get in tune with lots of little things that the average person probably wouldn't even notice.Most of what I cut is hardwood,I run into my share of evergreens,but probably at least 80% of what we handle ends up being hardwood.Therefore,we use up alot of chain,and that is money that comes out of MY pockets...Sooo,I'm NOT filing back chains just for the hell of it or because I'm compulsive.When I put on a new chain,I file back the excess metal under the cutting tooth,which in alot of cases sticks out farther than the actual cutting edge of the tooth.This lets the chain "bite" better and makes for a faster,smoother cut than the factory edge.If you are about to fall some hardwood tree,twice the diameter than the bar you're using,you need all of the cutting speed that you can get...I've been falling big timber and removing tough trees for nearly twenty years...I AM FAIRLY SURE I HAVE SOME IDEA OF WHAT I AM DOING!!!!!!