Recommendation? Tips for unclogging Venev resin bonded CBN?

[Mr. Spock]

I’m very happy with my Venev resin bonded stones but my 400/800 loads quickly and then doesn’t cut well. I’m already using water with a few drops of dish soap to try to float this material away before it embeds but I’m still seeing grey streaks in the stones and I can feel them skating over the knife.

My first instinct was the get a nagura but I’ve also had a pentel hi polymer eraser recommend, though I’m worried the latter could strip the abrasive from the matrix.

Any tips or suggestions?

 

[UncleBoots]

Any coarse stone in the 200-400 grit range should work well; that's roughly what the naguras that generally come with the Naniwa and NSK resin-bonded diamond stones are like, and they are effective on those stones.

 

[Bdtry]

Has the stone ever been lapped?

I haven't had any loading issues with my Venevs, I use water with a drop of soap, keep the stone very wet and rub the water around with my finger to distribute it, and don't press hard. I end up with swarf at both ends of the stone but never any streaks building up. Eventually the stone gets dirty and darkens and then to clean them I use a magic eraser or a generic melamine sponge and water. If there is a lot of build up then some light work with a nagura will clean out any loading. You will see the nagura making a slurry and eventually you will start seeing the resin colour being added in, that is usually when I stop.

My nagura is the dark brown 600 grit Naniwa in the yellow packaging, but I think they recently changed it all around, they have a ton of naguras in various grits on amazon now.

 

[chalby]

I wouldn't be too worried about the abrasive being stripped. The resin is very hard.

The methods I have used:

Magic eraser: works OK, does enough to remove most of any loading slowly
Rust eraser: works pretty well, lasts forever but only removes loading and is slow
Any medium or medium coarse stone or nagura will work well; also good for flattening
Some Barkeepers Friend with a green kitchen scourer also works really well just for refreshing the surface and quickly removing loading. I use this method the most these days.

 

[K80Shooter]

I use Barkeepers Friend to clean my stones, works great.

 

[Seedy Lot]

I have had Venevs for a few years now and use a ~1k grit nagura, works great for cleaning the stone.

 

[Diemaker]

Once you get degraded performance I expect you will need to dress them with loose abrasive to get them back to 100%. Other things will improve them but nothing compares to a proper dressing when needed.

 

[cudgee]

Other things will improve them but nothing compares to a proper dressing when needed.