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Drill bit types

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Goran Hosinsky	04/12/2010 15:31:01
41 forum posts	There seems to be two basic HSS drill bit types, the rolled one and the ground one, the second being somewhat more expensive. What is the difference in use? Goran Canary Islands
Speedy Builder5	04/12/2010 16:03:54
2878 forum posts 248 photos	Never come accross a rolled drill bit, just plain machined, and machined with clearance lands right the way up the drill on the edges of the spiral.
Goran Hosinsky	04/12/2010 16:51:35
41 forum posts	Perhaps I am using the wrong terms but what I seen in the catalogues are Rolled high speed, straight shank HSS drill bit respective HSS fully ground drill bits, Goran
JasonB	04/12/2010 18:38:52
25215 forum posts 3105 photos 1 articles	The rolled ones are a cheap basic form of manufacture, OK for a bit of DIY around the house but they are not as good as fully ground bits being more likely to wander, fracture of cut over/under size. The main flute pattern is rolled and then the edges ground whereas a fully ground bit has the flutes and edges ground Jason
larry Phelan	25/08/2017 17:33:02
544 forum posts 17 photos	I have some rolled drill bits and never have any problem with them.
Clive Hartland	25/08/2017 22:46:57
2929 forum posts 41 photos	There was a programme on Discovery about drills being manufactured and they showed the flutes being milled both at the same time. The profiles of the flutes ground into the special cutters. Clive

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