| 摘要 |
A reamer is provided with substantially helical extending carbide-bladed teeth by forming a reamer body having roughly shaped helical teeth thereon along the front face of each tooth a groove extending rectilinearly lengthwise and obliquely to the reamer axis, inserting into each such groove a small straight carbide strip shaped to fit snugly within the groove, the height of the strip being such that its upper end projects radially, over its whole length, above the tooth end and also beyond the extended diameter of the reamer, such strip also extending obliquely of the reamer axis, and subjecting each such strip to a grinding operation in which its upper end projecting beyond the reamer diameter is first rounded off to conform to the reamer diameter and a first cutting edge is formed at the leading edge thereof, and then the end portion of the strip is separately ground to produce a main cutting edge inclined at an angle to said first cutting edge in the direction of said reamer axis.
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