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Drill bit types

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Goran Hosinsky04/12/2010 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?

Canary Islands
Speedy Builder504/12/2010 16:03:54
2416 forum posts
191 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 Hosinsky04/12/2010 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
HSS fully ground drill bits,
JasonB04/12/2010 18:38:52
21468 forum posts
2455 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
larry Phelan25/08/2017 17:33:02
544 forum posts
17 photos

I have some rolled drill bits and never have any problem with them.

Clive Hartland25/08/2017 22:46:57
2729 forum posts
40 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.


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