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Unlock Precision sa Advanced CNC Deep Hole Drilling Techniques Table of Contents 1. Introduction sa CNC Deep Hole Dri. 2. Importance of Precision in CNC Deep Hole Drilling 3. Advanced Techniques in CNC Deep Hole Drilling 3.1 Bi-Directional. Drilling 3.2 Peck Drilling Method 3.3 Gun Drilling Method 4.