American pattern round chainsaw file
Tighten tension on chain to firmly support cutters when filing
File from inside to outside of cutter
Place file against beveled cutting surface of teeth 20 to 45 deg with saw Sharpen all left hand cutters on one side of chain
Then move to the other side and file all the right hand cutters
Check depth gauge height every two or three sharpening
Height between cutting teeth and depth gauge is between 0.02 to 0.03 in