99307 超倍比钻頭為何不能使用偏心套? ㄧ般淺孔鑽沒有固定中心,所以使用偏心套,可以直接調整外刃位置,達到所需鑽孔尺寸。但是ㄧ般淺孔鑽能作深度的極限約5倍直徑.如果更深的孔,均須有支撐來輔助.
99307超倍比鑽頭主要支撐來自 CD6/CD8 中心鑽刀片 6mm/8mm 中心柱的支撐。當中心鑽用自己成型的孔做支撐,是一種無間隙的高支撐設計(類似隧道工程的潛遁機),
穩定度及加工直線度超好。刀具往前進,會產生新的支撐壁邊,ㄧ直確保無間隙的支撐。因此使用偏心套將造成支撐孔徑(6mm/8mm)過大,沒有支撐效果,超倍比鑽頭將無法使用。
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