Sharpening Forstner bits

[condeesteso]

Any tips on a fine sharpenijng medium that will get into the spaces? I have small slip stones but they aren't really fine and even with those access is an issue. I'm considering an offcut of Corian as it is very good at polishing blade edges :shock:
I have some Freud bits that could do with hotting up, any advice?

 

[katellwood]

I use a small grinder in a dremell

 

[DennisCA]

Here's a video https://www.youtube.com/watch?v=EGqQyVoR5RQ

 

[RobinBHM]

I use a needle file set for wood drill bits

 

[Phil Pascoe]

Needle file.

 

[custard]

Needle file followed by ceramic slip

http://uk.knivesandtools.com/en/pt/-spy ... wwodz1QAvg

 

[No skills]

For the sake of joining in, a diamond needle file.

 

[lanemaux]

And to set the cat amongst the pigeons , a popsicle stick with auto body finishing abrasive adhered to it . Scary sharp light as it were.

 

[condeesteso]

excellent response all, many thanks. Been out there this morning and tried a few - much better cutting. I used needle files but also small diamond files. I suppose I come from the hand-tool p.o.v. and am used to requiring very fine edges (chisel say) so filing just felt a bit rough. But I imagine what I get is a series of small teeth left by file, which interms of cutting is fine.
Lanemaux, I like the sound of the stick with an abrasive stuck on, it's a bit like the idea I was wondering about a sliver of Corian with an abrasive paste on it. But I need a quick result too, so the filing approach has helped a lot.
That video is excellent by the way.
Thanks to all!