Основной каталог Winstar 2021 - страница 699

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Technical Data Troubleshooting in Drilling Trouble Occurrences Countermeasures 1.Check for suitable guide-bush Becoming thread scratch in the hole 2.Reduce relief angle 3.Check for proper point angle & length of lips 1.Reduce relief angle 2.Grind web thinning 3.Shortening length of drill Deformation of hole Generation of chattering & vibration 4.Check for proper drill 5.Check for chuck & collet & socket 6.Pre-centering 7.Inspect rigidity of the drill machine 1.Increase feed 2.Check for proper helix angle Poor chip evacuation 3.Check for proper chip space 4.Using step feed 1.Check for suitable guide-bush Drill won't enter work 2.Reduce feed 3.Pre-centering Deflection of hole Insufficient rigidity of drill Shortening length of drill Unsuitable angle Regrinding 1.Reduce cutting speed Excessive wear 2.Check lip relief Cutting speed too high of cutting edge 3.Increase coolant flow 4.Check for proper material E012 Customized & Tooling