Originally Posted by kevinf1990
but my question is that if i move the screw will i physically see a part move. and i am also asking this because of chain rub
Most of the time if you adjust the limit screws, you won't see anything elso move. After you do that, however, you may find that either you can't shift into either the largest or smallest chainring on your bike, or that you overshift the chainring and the chain comes off.
When you adjust your front deailleur, it is important to make all of the adjustments in the correct sequence. My best advice is to access the Park Tool website and follow their detailed instructions to the letter.