Drill Sharpeners Compared.

[Michael GilliganParticipant @michaelgilligan61133]

Excellent link, Bill

Thanks !

MichaelG.

[bernard towersParticipant @bernardtowers37738]

I seem to recognise that article, it must be where I got my info from.

[PlasmaParticipant @plasma]

made a new chuck to hold drills smaller than 3mm.

[Neil LickfoldParticipant @neillickfold44316]

Thanks for the images Bernard.

I was shown that trick as an apprentice in 1982. The only difference was to add a small radius on the outer edge. The angle on the edge of the drill I use is about 15 deg per side. So about 1/2 of what you have shown. It does improve the surface finish of the hole, and it also seems to drill a straighter hole as well. The radius edge is used where we don’t have a reamer of the size required ,but do have a drill bit of the desired diameter.

The limit today, is the wear of the very centre of the drill.

Cobalt HSS drills do last alot longer than the standard hss alloys that are out there in the cheaper grades these days.

The more accurate the outer angle is created, the better the drill will be to size and roundness.

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