A riving knife was fitted in direct line 3cm away from the circular saw at the bench level.
在工作�水平离圆锯3厘米远的直线上装有锯尾刀。
英语百科
Riving knife
A riving knife or splitter is a safety device on table saws, circular saws and radial arm saws used for woodworking. While comparable in their safety function, they are different devices, each with its pros and cons.
Splitters are fixed in relation to the saw table, riving knives are fixed relative to the blade and move with it as blade depth is adjusted.