I picked up an old saw blade and metal... I was told the saw blade is from an old brush cutter... The other from an old saw mill... Expect it might be a planner blade. The old saw blade is 19" and the planner blade is 20"... The planner blade is about 3/8" think.. Any general advice making a knife out of them? Working with old blades? I have done some work with 1095 steel.