Re: [CAD_CAM_EDM_DRO] Flat Holes

If you're planning on doing this frequently, you can buy a special stepped
drill bit made for c'bores. It has the through hole dia. & c'bore dia on one
bit, makes things a little easier for production work. Probably not worth
the $ if you're only doing a few holes though.

Rick

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, November 10, 2001 1:20 AM
Subject: Re: [CAD_CAM_EDM_DRO] Flat Holes


> gm4ta@... wrote:
>
> > Is there a special type of drill bit to make holes with perfectly
> > flat bottoms? All the drill bits I see are somewhat tipped. I want to
> > make flat-bottomed holes so I can recess socket head cap screws.
>
> If you drill the through hole first, an end mill will make a countersink
> with a flat enough bottom that it doesn't matter. I do this all the time.
>
> Jon
>
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