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14 Produce pilot hole in one go up to a maximum hole depth of 2 5xD Angled or curved surfaces can be machined up to a max inclination of 50° without prior spotfacing Applying a countersink at the hole entrance is not possible on angled or curved surfaces It is advisable to use the tool with external cooling Be careful to ensure that the coolant is aimed directly at the tool tip This will ensure that there is adequate cooling and effective chip evacuation Apply our cutting data recommendations when using the tool Produce pilot hole in a single sweep If required a 90° chamfer can additionally be produced at the hole entrance with flat drilling application after the 2 5xD hole depth is reached 2 Pilot drill with 90° chamfer 1 Pilot hole in angled or curved surfaces General references WTX – Micropilot application recommendation max 2 5xDC 1 max max 2 5xDC 1 50° 45° max 2 5xDC 1 max 2 5xDC 1 max 2 5xDC 1 Solid carbide drilling Technical Information