Warner wrote more than a 3 word answer. We may be in for a short novel, who knows? Historical probably having to do with old iron things that make sawdust.It is almost always on sliding TS, which are almost always used for cutting sheet goods.
The scoring blade climb cuts and its primary function is to elminate tear/chip out on prefinished sheet goods, melamine, veneer ply or mdf. It is a Euro thing and came from the way and material they use to build cabinet boxes.
WarnerConstInc. said:It climb cuts (blade spins same direction as you feed the material) to avoid tear out. If it spun the same direction as the main blade, well that wouldn't help with any thing. The climb cut cuts up through the finished surface instead of down through it.