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Polishing grit - 6000 vs 8000 grit

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Forum topic by paxorion posted 12-06-2015 03:58 PM 893 views 0 times favorited 8 replies Add to Favorites Watch
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paxorion

1102 posts in 1511 days


12-06-2015 03:58 PM

Topic tags/keywords: question sharpening

I currently use a mix of water and diamond stones for sharpening. DMT Dia-Sharp (extra-coarse ~ 220grit and extra-fine ~1200 grit) and 2 King waterstones (1000 and 6000 grit). I am curious if I am missing out by not finishing with 8000 grits rather than 6000 grit (I bought the 6000 rather than 8000 because of the $40+ cost difference at Woodcraft).

Without a frame or reference, I am curious if it makes sense to invest in an 8000 grit waterstone? I’m curious because I am planning on investing in more high end joinery planes from either Lie-Nielsen or Veritas and am curious how much of a difference finishing at 6000 to 8000 grit would make. As far as I can, most arguments for finishing at higher grits is for polishing which promotes edge retention?

PS: I’ve already considered honing compounds and my question is NOT about adding honing compounds into the regiment.

-- paxorion


8 replies so far

View AandCstyle's profile

AandCstyle

2575 posts in 1723 days


#1 posted 12-06-2015 11:09 PM

Hey, Pax, I can’t say whether you are missing out or not, but I went to the LN event at CP Johnson’s and they were recommending this 1000/8000 stone. However, if I were in the market I would go for the Shapton stones. :)

-- Art

View Loren's profile

Loren

8313 posts in 3114 days


#2 posted 12-06-2015 11:30 PM

I believe, based on experience with water stones,
that they cut the same but a fine iron sharpened
to a finer level of polish will hold its edge longer.

In this way, if you get really good at sharpening,
an 8000 grit polish can save the artisan some
time. As a practical matter you may want to
consider that modern honing guides permit
hard pressure not usable when sharpening by
hand in the traditional manner. Japan irons are
about 1/4” thick and it is comparably easy
to balance the bevel on the stone and a micro-bevel
is seldom used. With thinner western style irons
balancing the bevel is a lot trickier and the use
of a guide becomes even more sensible. Guides
that ride on the stone result in uneven stone
wear. Unfortunately not many guides that do
not ride the stone are available.

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TheFridge

5765 posts in 952 days


#3 posted 12-06-2015 11:43 PM

Do what you want. An 8000g stone isn’t a strop and will never be.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View Julian's profile

Julian

1038 posts in 2156 days


#4 posted 12-07-2015 01:41 AM

I doubt you would see any difference in performance on a edge cut between 6000 and 8000. How far you sharpen is all a personal preference. I sharpened my plane blades to 4000 (waterstone) and sometime use polishing compound and I can get a shaving at .002”.

-- Julian

View GregTP's profile

GregTP

51 posts in 409 days


#5 posted 12-07-2015 08:41 PM

Rob Cosman has a good tutorial on you tube about using waterstones and I believe he speaks to which grits he uses. I happen to have a 12000/15000 waterstone (I dont know who makes it but I was told it comes from a lake in England), but I got it for free from a guy who didnt use it anymore. If I was buying it new I wouldnt have bothered to go that high, but it does put a mirror polish on irons.

-- From exercise machine warning label: "Step ladders can cause injury and even death; the ROM machine is more dangerous than a stepladder"

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jmartel

6575 posts in 1616 days


#6 posted 12-07-2015 09:12 PM

My 8000 grit stone doesn’t quite leave a polish. My 13000 ceramic stone does, however. I have a 400 Atoma diamond stone, 1000, 8000, and 13000 ceramic stones.

-- The quality of one's woodworking is directly related to the amount of flannel worn.

View rwe2156's profile

rwe2156

2198 posts in 947 days


#7 posted 12-08-2015 01:17 PM

I doubt you’ll see much difference.
My highest stone is an 8000 and unlike, the previous poster, I think it polishes the edge quite nicely.
I can go right from the 8000 to work and I am quite pleased with it.

I don’t see any point in going over 12,000 because it means more stones and more expense its much cheaper to just use a strop.

I personally know people who use the Shapton stones they seem to be the pinnacle of sharpening stones but IMO, I can’t see justification for the expense. In the end, you still have to flatten them like a water stone.

I would go with what you have and with some added stropping you will get a very good edge.

-- Everything is a prototype thats why its one of a kind!!

View toddbeaulieu's profile

toddbeaulieu

781 posts in 2470 days


#8 posted 12-08-2015 01:47 PM

I go to 8,000 and think that it puts a really nice edge on it. Any higher I would be overkill IMO. I use a hand held loupe to inspect the edge as I’m sharpening and found 8,000 to get a really nice polished surface.

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