| 摘要 |
The broach (1), comprising a rod (2) of a cutting tool material with a cylindrical starter guide (15) and a cutting section (20) with forward-facing teeth (21), has its cutting section divided into a number of sub-sections (25) separated by re-centering guides (26) of the same diameter as the starter guide. Each of the cutting sections has at least three and up to six teeth, and each re-centering guide has a chamfered leading edge. |
