Technical Data Drill Troubleshooting Guide 鑽削加工異常原因及對策 Trouble / 情況 Occurrences / 原因 Countermeasures / 對策 1.Check for suitable Guide-bush  使用適合之鑽套 Becoming thread scratch in the hole 2.Reduce relief angle 形成螺紋刮痕  減少間隙角度 3.Check for proper point angle & length of lips  檢查鑽頭尖端角度及兩邊長度是否對稱 1.Reduce relief angle  減少間隙角度 2.Grind web thinning  腹板削薄 3.Shortening length of drill  縮短鑽頭長度,增加剛性 Generation of chattering & vibration 4.Check for proper drill Deformation of hole 產生顫動、振動  檢查鑽頭角度研磨是否正確 鑽孔成橢圓 5.Check for chuck & collet & socket  檢查夾具與鑽頭接觸情形 6.Pre-centering  預先鑽好中心孔 7.Inspect rigidity of the drill machine  提高工作機械的剛性 1.Increase feed  加大每週進給量 2.Check for proper helix angle Poor chip evacuation  選擇正確螺旋角 切屑排出不易 3.Check for proper chip space  加大槽寬比 4.Using step feed  採用間歇式進給 1.Check for suitable Guide-bush  使用適合之鑽套 Drill won't enter work 2.Reduce feed 剛切入時不良  減少切入時之每週進給量 3.Pre-centering  預先鑽好中心孔 Deflection of hole 鑽孔傾斜 Insufficient rigidity of drill Shortening length of drill 鑽頭剛性不良 縮短鑽頭長度,增加剛性 Unsuitable angle Regrinding 鑽頭角度不對 再研磨 1.Reduce cutting speed  降低切削速度 Excessive wear 2.Check lip relief Cutting speed too high  加大間隙角 of cutting edge 切削速度太快 3.Increase coolant flow 外角磨損  充分供給切削液 4.Check for proper material  提高鑽頭之材質 C104