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1st September 2011, 09:16 PM #1Rank Beginner
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6000 grit "cloudy" finish on King waterstone
I've been flattening and polishing Titans. I've been polishing to 400 grit wet and dry sandpaper, then moving on to my 6000 grit King waterstone.
The backs are very shiny off the 400 grit, but develop a rather patchy, cloudy finish when applied to the 6000.
Is this usual? It doesn't seem to behave this way on the bevel, where it polishes up nicely.
I don't use a nagura. (Can't find it, for one, and Hock's book on the sharpening argued convincingly that it doesn't do much).
I've been flattening the stone on 400 grit W&D, which most people seem to estimate is about the same as using a 1200 grit waterstone. I can't see any abrasive contamination, and the stone comes out a uniform colour, so I trust this isn't the problem.Cheers,
Eddie
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1st September 2011 09:16 PM # ADSGoogle Adsense Advertisement
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1st September 2011, 10:39 PM #2
The stone should be dry & you add a little water with a spray bottle.
Keep rubbing the back of the chisel/plane blade until you can hardly move it on the stone - the stone should be almost dry by now.
Add a little more water & clean the black marks off the stone & repeat.
Should be only a couple of repeats to achieve an uncloudy mirror
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2nd September 2011, 09:42 AM #3Rank Beginner
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Yes, that's much better.
Still cloudy rather than shiny, but in a much more uniform and "finer" way.
Sharper too, which is the point.
Only five more chisels and three irons to go...:Cheers,
Eddie
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2nd October 2011, 02:11 PM #4Hewer of wood
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Nothing wrong with a haze finish all other things equal.
A mirror finish is said to be the acme but you can get one (to the naked eye) just by using a synthetic abrasive that produces even scratches that refract the light in the same way. Take a close look with a loupe and you'll see distinct scratches.Cheers, Ern
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2nd October 2011, 03:10 PM #5
It doesn't make much difference to the flatness, but the main difference between a cloudy and mirror finish off a fine waterstone is the amount of water used IMHO.
I used to apply water VERY liberally, thinking that this removed the abraded metal particles more effectively. Then one day Jim Davey showed me his technique on a fine waterstone, using hardly any water at all. Keep polishing even as the stone begins to dry out, and DON'T add more water. That grimy black film building up on the stone is what will give you the mirror finish.
On chisel backs I can get a mirror finish more easily working across the width of the stone, working the same spot to build up the black gunk faster.
Many stones (including ceramics) almost have different cutting properties depending on how much water is used, i.e. a finer finish with less water used.
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2nd October 2011, 06:11 PM #6GOLD MEMBER
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The muddy bog that builds up on the stone is what gives the shine. Only add enough water to keep it wet, not wash off the stone. wash the stone off between chisels etc.
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5th October 2011, 10:45 PM #7
Well you learn something every day on this forum. Thanks for the info as I just started using jap waterstones, wish someone had said about the water before, now I know what I'm doing wrong.
SBPower corrupts, absolute power means we can run a hell of alot of power tools
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