On Wednesday, June 1, 2016 at 6:37:29 AM UTC-4, Jon Anderson wrote:
Bought a drill sharpener from Hare and Forbes here in AU, per link
https://www.machineryhouse.com.au/D111

Nobody at work besides me can hand sharpen a drill, and without
an Optivisor, I don't do so good anymore. Environment is an abattoir
maintenance shop, we don't do anything terribly precise.

Issue I'm having is sharpened drills tend to tri-lobe until about 1mm
deep, when things settle down. Have not had much time to experiment with
it. Seems like back rake is a bit shallow. This seems to be set by
selecting drill diameter on the left side when setting drill in the
collet. Appears to do a nice even grind, but have to mess with the
setting for split points, it's grinding more of a really severe web
thinning right now. Manual is not the best to help with solving issues.
So, what aspect of drill geometry is likely the culprit in the wobbly
starts? Really, has no effect whatever on our work, just kinda irritates
me. Drills start out as split points and do a nice job. Material is
mostly 304, with a fair bit of HRS.

As for the sharpener, though I've never used one of the plastic Drill
Doctors, I'd think it likely a big improvement. There is a tiny bit of
play between the collet holder body and the sockets where the drill is
sharpened. A ham-fist is not going to get the best results, but with a
bit of care, looks to be capable of doing a good job and holding up.
Nowhere near enough use yet to gage diamond wheel life.


Jon

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Have a look at the videos on the Drill Doctor web site - they do point-splitting that is..."different" but it works well. It may help you make sense of what your machine is doing.