9/20/2023 0 Comments Drill bit sharpener harbor freightDerek Brown's sharpener is much easier to build and use but doesn't illustrate drill geometry variables as well since they are fixed during construction. Plus, it allows experimenting with relief angles, easily allowing four facet and six facet sharpening of drills, for example. Adjusting and using this fixture is effectively a mini-tutorial on drills and their geometry. My understanding of drill point geometry and drill sharpening improved considerably from reading Mazoff's article and especially from using the HoneDrill fixture. My original goal was to produce center drills with four facets to reduce wander at startup - the ability to sharpen all small drills was a fringe benefit which happened to come along with the sharpener for center drills. I had noted that center drills can wander at start of drilling: their short, stiff nature isn't really a solution so much as a way around most of the problem. Four facet geometry: reduces wander at startup, needs less pressure for drilling, generates less heat, and wears more slowly. ![]() My interest in building a drill sharpening jig arose from reading that four facet drill geometry improves overall drill performance. ![]() Sharpeners for small drills are expensive so Derek's four facet sharpener is the best option for sharpening small drills in the home shop. Note that few commercial sharpeners handle small drills (under 0.100"). As is using the Pit Bull type sharpener for larger drills. Derek Brown's four facet drill sharpener is easier to build and quickly sharpens small drills very well both are described below. Ian Bradley's HoneDrill fixture can sharpen medium/small size drills, facet larger drills, and hone some other cutters. Small drills are not handled by this sharpener so another approach is needed. The Pit Bull type inexpensive conical sharpeners can do an acceptable job on twist drills from 1/2" down to about 1/8". Sharp drill bits are helpful in getting the best from the minilathe as well as the drill press, mill-drill, and even a hand drill. ![]() NOT hand held sharpening on a bench grinder. This page describes shop built drill sharpening jigs, * * © 2014 by John Moran Drill Sharpening Etc.Ĥ/6 Facet Drill Sharpener, Point Splitter Optional
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