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 Generation of chattering & vibration 4.Check for proper drill Deformation of hole 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 Customized & Tooling 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