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Contour selection is made on the basis of the material to be drilled, and the details of the particular application. As a rule, the greater the bearing pads' area of contact, the better control of size and finish due to increased support and burnishing action. |
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| General purpose stock drill contour for steel, stainless steel, inconel and aluminum. Offers minimum bearing contact with the workpiece (non-micable). |
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| Recommended for all non-ferrous and cast iron up to gundrill diameter of .200" (non-micable). |
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| For good size control (including at exit) special purpose contour, where micable diameter is required or extra burnishing action is required, not for all materials (micable). |
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| For use in aluminum and brass for best hole finish and for intersecting holes and interrupted cuts, or extra O.D. support and burnishing. Use with wood and plastic in combination with .0015/.002" back taper. Do not use in high nickel content materials due to high burnishing forces (micable). |
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| For chips ahead reaming applications when opening up existing holes, e.g., valve guides (micable). |
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| For good size control, including at exit. Special purpose contour where micable diameter is required, or extra burnishing action is required, not for all materials (micable). |
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| Used for high penetration rates in applications such as lubrication holes. Contour for aluminum shown (micable). |
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| Bearing pad angles as defined by special requirements. CNC contour grinding allows us to manufacture to customer specifications. |
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