Основной каталог Winstar 2021

Troubleshooting in Drilling

Trouble	Occurrences	Countermeasures
	Excessive wear of cutting edge	Regrinding
	Too much feed	Decrease feed
Poor surface conditions of work iece	Chips clog in hole	Add number of exit
p	The others	1.Thin web 2.Check for proper guide-bush 3.Use the highly rigid spindle
	Feed too heavy	Decrease feed rate
	Chips clog in hole	1.Check for proper chip space 2.Check for proper helix angle
Breakage	Insufficient rigidity of drill	1.Reduce feed 2.Shortening length of drill 3.Increasing web thickness
	Unstable in throughout hole drilling	1.Reduce feed while throughout drilling 2.Check set up rigidity 3.Use the highly rigid spindle
	Feed speed too high	Decrease feed rate
Chipping	Tool high lip relief angle	1.Reduce lip relief angle 2.Reduce feed in drilling 3.Check set up rigidity
	During oversize operation	1.Properly grind point angle 2.Reduce cutting speed
Hole oversize	Point angle is not properly, large chip of one flute; small chip of other flute	1.Regrinding 2.Thin web 3.Properly grind point angle 4.Guide-bush