Re: [CAD_CAM_EDM_DRO] Drilling holes (was Re: Dumb question on the drilling of holes

At 03:01 PM 10/23/02 -0000, you wrote:

>How a drill actually cuts is another problem. If the two flutes were
>perfectly ground, the drill would start, drill, then as the depth of
>the hole allows the sides of the drill to engage, the drill would seize
>in the hole ruining the drill. Drill bits must be ground off axis or
>they will burn themselves up quickly. Most grinders do not have the
>capability for perfect symmetry, and most people don't have the
>patience to make that happen anyway.

You did real well down to here .. it is the aim of all grinders to make the
flutes equal, to prevent the drill cutting ovesize. That is also part and
parcel of all instructional materials on drill pointing. The reason they
don't burn up is the reduced land behind the edge.


Regards, Hoyt McKagen

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