Multi faceted drill bits – really necessary?

[Norman BillinghamParticipant @normanbillingham91454]

Not sure if it counts as advertising – in which case i'm sure mods will remove, but there is a recent book by Jorg Hugel called Drill Sharpening. It covers all the details of setting angles for cone and four facet drills in great detail and has a CD of spreadheets which let you see the effects of changing setting parameters for yourself. It's only available from SMEE and all profits go to the Society. Not for the mathematically faint heated. A message to the SMEE secretary via the web site will put you in contact.

[Gary WoodingParticipant @garywooding25363]

When I posted this ***LINK*** to a demo of the Sealey SMS2008 I was surprised that there was no response at all.

Here's a couple of before-and-after pictures of a drill sharpened on my device. It's really easy to use – just as shown in the video.The sharpened drill cuts very well – like it should.

[Howard LewisParticipant @howardlewis46836]

being one of the fortunate ones with a cutter grinder, (a mWorden so not the most complicated ) when my inertia can be overcome, ,sharpen my drills by the four facet method They cut , subjectively anyway, better than conical ended drills. The accuracy.of the resulting hole depends entirely upon my dexterity, not the machine or the process.

For those without a cutter grinder, there is still hope. D A G Brown produced pland for one or more jigs to produce four fcaet drills without a bench grinder, just a flat oil stone, or sheet of emery.

Howard

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