Основной каталог Winstar 2021

Troubleshooting in Drilling

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