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Forum topic by HokieMojo posted 09-22-2010 07:14 PM 1134 views 0 times favorited 6 replies Add to Favorites Watch
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HokieMojo

2103 posts in 3188 days


09-22-2010 07:14 PM

Hey everyone,
I don’t normally post craigslist finds that I’m contemplating purchasing on a forum. In most cases, that would be inviting competition. This time, I’ll make an exception though because if I don’t, I have no idea if I’m buying the right thing. I’m also hoping there will be enough that I can still pick one up if some others act on this.

I need a flat surface to sharpen my jointer knives on. I’ve heard granit can be an excellent option. It is as simple as getting a scrap piece of countertop? The posted item might be an ideal fit. Could any of you comment? Obviously, it is tough to tell what condition these pieces are in, but I’m just trying to figure out if this is the type of thing most people are refering to when they talk about a granite plate. The only other thing I can think of are the ones machinists use, but I think those cost a TON of money. any help would be appreciated. Here is the link!

http://richmond.craigslist.org/mat/1967362478.html


6 replies so far

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PurpLev

8523 posts in 3109 days


#1 posted 09-22-2010 07:44 PM

I use a scrap/cutoff from a granite top shop, so you’d be just fine with one of those. thats a good price. I don’t think you need th flatness and precision of a machinist plate. you just need a reliable surface that will not bow as you put pressure against while sharpening. I think people are getting a bit too obsessive about the flatness of the subsurface used for sharpening.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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spaids

699 posts in 3154 days


#2 posted 09-22-2010 07:46 PM

Dude go to woodcraft. They have slabs that are the same size as a full sheet of sandpaper. They are often on sale for $20 and they are thick and heavy and flat. On sale right now actually.

-- Wipe the blood stains from your blade before coming in.--

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spaids

699 posts in 3154 days


#3 posted 09-22-2010 07:50 PM

hmm but the ones you found are big right? You could put several grits on there side by side. The woodcraft slab is 9×12 and 2 inches thick. You could put three sheets on the slabs you found. I just spray glue down one sheet at a time and they are pretty easy to pull off and stick back down.

-- Wipe the blood stains from your blade before coming in.--

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ajosephg

1878 posts in 3021 days


#4 posted 09-22-2010 07:54 PM

I bought a 12×12 piece of polished granite tile from Lowes. Can’t remember the cost but it was nominal.

-- Joe

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HokieMojo

2103 posts in 3188 days


#5 posted 09-22-2010 08:12 PM

Thanks guys. I think you’ve hit on my main concerns. The jointer is an 8” model so to sharpen the blades, I think the extra space would be nice. Alternatively, I think the longer the blades, the more important it is to have a flat surface because I think the imperfectiosn could compound themselves over a longer distance.

Also, at $10, the price is right (Although I didn’t realize woodcraft happened to have a sale on their pieces). I also like the idea of being able to attach a few pieces at a time (I think I could actually get 4 grits on the slab at once).

I’m still open to anyone that wants to play devil’s advocate though.

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PurpLev

8523 posts in 3109 days


#6 posted 09-22-2010 08:35 PM

OK, I’ll play. :)
before that let me repeat: I agree that the surface needs to be flat and hard (non compression), but a granite slab if flat – is flat. my point was – if that is indeed granite, and you can assure that it has a flat surface with a normal straight edge, than it’s flat enough for sharpening – meaning you don’t need a machinist plate (that was my point).

Now, lets play…

I used to use a glass plate before, 3/8” thick, window size. yes – I could have glued sandpaper sheets side by side, but when not in use – that thing was huge to store, and was always in the way. YMMV based on your space though.

I ended up getting rid of it and got the small ~12×12 piece of granite from the coutertop shop (free) it’s easily storable, and actually being so small – just stays on the bench. I don’t need a full sheet to hone my blades, a 1/3 sheet is more than enough and I could stack those up to have 3 grits (1000,2000,12000) if needed, although I usually don’t go through the trouble and just slap on a full sheet, and replace it once done (the spray glue is easily pulled off).

it really boils down to personal preference though, either way – I think you got a good deal there, whether you get a full sheet or just a smaller piece from them

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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