Chisel and Semi-chisel Teeth
For general use in forestry, tree surgery and firewood cutting, three basic configurations exist. Full chisel chain has a square cornered tooth, splitting wood fibers easily in the cut for fast, efficient cutting in clean softwood. Semi-chisel chain has a rounded working corner formed by a radius between the top and side plates. While slower than full chisel in softwood, it retains an acceptable cutting sharpness longer, making it the preferred choice for dirtier wood, hard or dry wood, frozen wood or stump work, all of which would rapidly degrade full chisel chain. "Chamfer chisel" chains by Oregon are similar to semi-chisel design but have a small 45 degree chamfer between the plates rather than a radius. Performance is similar to good semi-chisel.
The key differences between semi-chisel and chipper chains are the size of the radius at the working corner. In cross-section a chipper tooth looks like a question mark, having a full radius over the whole cutting portion of the tooth, whereas a semi chisel design is more like a number "7" with the top-right corner slightly rounded.
Read more about this topic: Saw Chain, Modern Tooth Designs
Famous quotes containing the words chisel and/or teeth:
“You may chisel a boy into shape, as you would a rock, or hammer him into it, if he be of a better kind, as you would a piece of bronze. But you cannot hammer a girl into anything. She grows as a flower does.”
—John Ruskin (1819–1900)
“The beaux and the babies, the servant troubles, and the social aspirations of the other girls seemed to me superficial. My work did not. I was professional. I could earn my own money, or I could be fired if I were inefficient. It was something to get your teeth into. It was living.”
—Edna Woolman Chase (1877–1957)