WebNov 21, 2024 · Micro-drilling techniques produce components such as molds and mold components for medical devices and surgical tools, aerospace parts and consumer … WebBy contrast, smaller helix angles are used for hard, short-chipping materials. Twist drills with a very small helix angle (10° - 19°) feature a drawn-out helix. In contrast, twist drills with a large helix angle (27° - 45°) feature a compressed, short helix. Twist drills with a normal helix have a helix angle of 19° - 40°.
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