| 摘要 |
PROBLEM TO BE SOLVED: To provide a reamer enough capable of performing cooling and oiling to cutting blades and cutting parts, and further, enough capable of performing the washout of chips. SOLUTION: A central jet hole 9 penetrating through the tip part of a reamer head 1 along a central axis from the tip part 7a of a cutting oil supply path 7 in the reamer which the cutting oil supply path 7 extending to the vicinity of the tip part from the backward along the central axis O of a reamer head 1 and a plurality of cutting oil jet holes 8 are formed with branches in the slanting direction to the central axis O from the tip part 7a of the cutting oil supply path 7.
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