CoreyB
Addicted to ArboristSite
I cut a lot of white & red oak, Hickory, elm and hedge. I have seen a spark other two myself. Some trees are harder then others just for where they grew at.I've seen sparks fly in the daylight while cutting dead hedge limbs. And I have cut dead standing, dry white oak that was hard as marble. That stuff wrecked chains.
Thread drift but I wanted to throw in my 2 cents from personal experience...