35315Re: [MILL_DRILL] how to drill deep holes
- Feb 2, 2014In article <1391314173.63870.YahooMailNeo@...>,
Tom Curlee <tcurlee@...> wrote:
> - Start the hole with a center drill.That is the normal procedure. When you've used your "long" bit you move to
> - Drill the hole with a short shank drill (screw machine bit?).
> - Deepen the hole with a normal length bit.
> - Finish the hole with a long shank or spade bit.
the "extra long" series.
Interestingly, anything deeper than three times the drill diameter is
considered a "deep" hole", though I think most of us would cheerfully
drill almost to full flute depth without much thought.
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