Drill Notes?

[EricB]

Am I correct in thinking the finish drill called out here has no point at the end?



Eric

 

[Ulma Doctor]

i would think so

 

[EricB]

It would need relief angles too so really I would need an end mill?

Eric

 

[benmychree]

You just grind it like a regular drill point, only with no point, we call it a "flat bottom drill". I grind them with a normal primary clearance of perhaps 4 deg. and then a secondary clearance angle, more or less looking like the end on an end mill. also clearing the web, as is done on an end mill that is center cutting, all this is easily done on a regular bench grinder.

 

[EricB]

OK Thanks!