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The center design of our gundrills allows for a wide range of nosegrinds from a full spherical radius to a flat bottom design. The nosegrind angles are important in attaining the best quality results. Angles can be modified to improve the flushing action of the high pressure oil and to improve chip control. Specific grinds have been developed for severe applications such as exit breakouts and interrupted or angular entries. Some of the most popular nosegrind configurations are shown here. |
General purpose stock drill grind for steel, inconel and stainless steel, most often used with stock 'R1' O.D. contour.
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In aluminum and brass, use this grind with 'R4' O.D. contour for best hole finish.
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For drilling , stacked parts and angular entries. Due to the point's placement near the center of the drill, this is the strongest gundrill.
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For applications requiring nearly flat bottoms. It can also be ground for a completely flat bottom, or on difficult materials used to qualify bottoms only.
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| Facet grinds are preferred on specific applications, or when regrind fixtures limit the cam type sharpenings. They can be ground to various slash type angles with good performance and allow a greater amount of clearance for coolant to cool the chip at the cutting edge. This grind is standard on most European applications. |
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Chip Breakers Facet grinds are preferred on specific applications, or when regrind fixtures limit the cam type sharpenings. They can be ground to various slash type angles with good performance and allow a greater amount of clearance for coolant to cool the chip at the cutting edge. This grind is standard on most European applications. Chip Breakers are generally used to break string type chips often attributed to gummy material or when machines limit the surface footage necessary to generate the heat needed to break a chip. There are two types of Chip Breakers:
The Radial Chip Breaker runs down the length of the carbide flat and lasts the life of the tool.
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The Standard Chip Breaker is reproduced each time the tool is ground.
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