| 摘要 |
A carbide tipped, ball bearing guided router bit has specially shaped cutting edges. It trims the overhanging edge of a plastic laminate cemented to a supporting base so that it is flush with the edge of the supporting base with the upper portion of the trimmed edge gently curved. It exposes only a minimum of the core of the laminate to view. The shape of the cutting edge includes a first straight portion at an acute angle to the axis of rotation, an arcuate portion and a second straight portion. The two straight portions are tangential to the arcuate portion at each end of the arc.
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