This paper analyses that tip angle of drill bit influences on cutting capability and life of twist drill, when the material and shape of work piece is different.

分析了工件材料无码国产有码精品91、形狀不同時，鉆尖頂角的大小對麻花鉆切削性能及壽命的影響，介紹了麻花鉆的鉆尖頂角的選擇性交小视频。

Leaves in opposite pairs, thin coriaceous, oblong, or phi needle-shaped, long 6-14 cm, the top length gradually sharp, pointed or slightly blunt wedge base, edges wavy or light wavy; petiole length 8-15 mm; stipule wide and triangular, was born in the Ministry of young vine at the top of drill-like long-tip , was born in the old vine, 3-6 mm long, the top regular convex tip.

葉對生，薄革質(zhì)日本亚洲欧美日韩工程，矩圓形或披針形91视频久久久，長6—14厘米，頂端長漸尖国产免费午夜福利短视频在线观看，基部楔尖或略鈍黃色网站中文字幕，邊緣波狀或淺波狀；葉柄長8—15毫米18禁免费观看；托葉寬三角形狠狠ⅴ日韩v欧美v天堂，生于幼枝上部的頂端鉆狀長尖，生于老枝上的長3—6毫米国产黄毛片在线看，頂端常凸尖国产永久免费A片。

The so-called cutter location point, the flat end mill tool axis refers to the point of intersection with the bottom tool; for ball-end milling is the ball part of the core; for tools is the tip; the drill is the drill point; for wire electrode cutting machine, it means that the axis line of the electrode surface and the focus of parts.

所謂刀位點，對于平底立銑刀是指刀具軸線與刀具底面的交點美女一级；對于球頭銑刀是指球頭部分的球心18禁美女黄网站色大片免费观看；對于車刀是指刀尖；對于鉆頭是指鉆尖色网站免；對于線電極切割機床jizz日韩，則是指線電極軸心與零件面的焦點。

tip of infection thread：侵染線的頂端

tip of drill ==> 鉆尖 | tip of infection thread ==> 侵染線的頂端 | tip of lightning rod ==> 避雷針尖