MULTI-FACET SHARPENING OF LARGER DRILLS

摘要

Several factors share the inspiration for this device. Derek Brown and Giles Parkes for their articles on the four and six facet sharpening method, the desire to build a 4inch scale traction engine requiring larger equipment and the current national economic circumstance. Many years ago I bought one of the splendid 'Reliance' drill grinding jigs to sharpen up to about 5/8 in. dia. at a push, but I have always had to sharpen larger drills by hand and the results are somewhat hit-and-miss.