Granite for flattening

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Forum topic by Yacman23 posted 09-17-2016 01:16 AM 1721 views 0 times favorited 27 replies Add to Favorites Watch
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4 posts in 762 days

09-17-2016 01:16 AM

Does anyone know if it’s acceptable to use a remnant of countertop granite for flattening plane soles?

27 replies so far

View Ross's profile


142 posts in 2117 days

#1 posted 09-17-2016 01:30 AM

Works for me. I have been using a piece of remnant granite counter top to flatten chisel backs and plane irons for years. I have used cement blocks to flatten plane soles

-- "Man Plans and God Laughs"

View cooltimbers's profile


10 posts in 3477 days

#2 posted 09-17-2016 01:31 AM

I assume you mean as a substrate to attach sandpaper to? If it is flat, then I guess so.

View BurlyBob's profile


5916 posts in 2410 days

#3 posted 09-17-2016 01:40 AM

Definitely!. Like Ross I’ve been doing it for several years. I’ve got one sizable piece set up with 6-7 pieces of wet/dry paper from 220 to 2500 grit. I’ve also got 3 longer 4”+ slabs maybe 28” long with double lengths for flattening plane soles. I’m very satisfied with the results.

View TheFridge's profile


10308 posts in 1631 days

#4 posted 09-17-2016 02:43 AM

I have a large sink cutout. I get the same scratch patterns no matter where I put the paper. I’m happy.

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

View Bill White's profile

Bill White

5070 posts in 4105 days

#5 posted 09-17-2016 02:56 PM

Sink cut-out here as well. 3 cm thickness and flat. Free. What’s not to like?


View Woodknack's profile


12369 posts in 2525 days

#6 posted 09-18-2016 03:52 PM

I have several granite pieces and none are truly flat.

-- Rick M,

View HokieKen's profile


6276 posts in 1283 days

#7 posted 09-19-2016 12:17 PM

I have a granite surface plate that is dead flat and I have two 12” granite tiles that are pretty close to flat. Close enough for dressing chisel backs and planes. But, I had to buy 24 tiles and sort through them to find 2 that were flat enough to suit me. I just returned the rest to Lowes. Granite is an excellent substrate and is very stable but isn’t usually truly flat unless it was intentionally ground to be that way. Most of it is slightly dished. I’d say check it and if it’s flat enough, then use it.

-- Kenny, SW VA, Go Hokies!!!

View HickWillis's profile


114 posts in 804 days

#8 posted 09-19-2016 01:54 PM

For the folks who have sink cutouts or whatever it may be…are they from when you bought granite for your kitchen, bathroom etc? Did the granite company charge you anything to keep the cut out?

-- -Will

View Aj2's profile


1717 posts in 1943 days

#9 posted 09-19-2016 02:04 PM

I have not seen any granite scraps big enough to work with flat enough for me.
They are not very thick and will flex.
I paid 185 for my 30long 24w 4thick.Its not super precision but I use it a lot for a reference surface.And small assembly table.


-- Aj

View Bill White's profile

Bill White

5070 posts in 4105 days

#10 posted 09-19-2016 02:11 PM

Sink cuts are waste. The granite fab shop here throws the broken splashes and cuts in the dumpster. They do not charge me for the remnants.


View BurlyBob's profile


5916 posts in 2410 days

#11 posted 09-19-2016 03:16 PM

Ditto what Bill said. the outfit I found was glad to have me haul off some. They have to pay to dump the scraps.

View HickWillis's profile


114 posts in 804 days

#12 posted 09-19-2016 03:29 PM

Good stuff, thanks fellas. I have a granite shop near me, I’ll stop in and see if they have any scraps.

-- -Will

View JayT's profile


5872 posts in 2356 days

#13 posted 09-19-2016 04:08 PM

Ditto what Bill said. the outfit I found was glad to have me haul off some. They have to pay to dump the scraps.

- BurlyBob

Same here. Stopped at a countertop shop and asked if I could buy a small piece of cut off. The guy laughed, pointed me at the waste pile and told me to take as much as I wanted so they didn’t have to pay to dump it.

A couple things I learned at a Woodworking Show session with Rollie Johnson. Try to find the darkest granite you can, darker means denser and more stable—that’s why reference plates are made from black granite. Second, try to see if you can find some that has been surface ground flat, but not yet polished. It will be the flattest at that point, as the polishing process can introduce some small imperfections.

Regardless, a decently flat piece of granite will get your planes flat enough to use.

-- In matters of style, swim with the current; in matters of principle, stand like a rock. Thomas Jefferson

View Kelly's profile


2092 posts in 3089 days

#14 posted 09-19-2016 04:30 PM

I use a Makita and a Milwaukee variable speed grinders to work granite. I dribble a bit of water on the bits, pads and stones to GREATLY extend their life (I use a 3/8 hose off an adapter, with a valve, mounted to a garden hose). I run the grinders at near the lowest settings.

The pads, stones and router bits are available all over the Net. I have pads ranging from 50 to 6,000 grit. The stones are large and just spin on, but only run about ten bucks. They are about forty or fifty grit and will remove a lot. Perhaps too quick for these purposes, since I’ve used them to round over edges.

If you had a piece of scrap that was close, you may only need the 100 or two hundred to start. Finer grits would only be necessary to bring a polish. In fact, if you were within a few thousand’s, you could touch the face with 800 or 1000 and check it.

I suspect most tiles and slabs are going to be fine for most of us.

View tshiker's profile


40 posts in 1454 days

#15 posted 09-22-2016 11:03 PM

If for some reason you can’t find or don’t want scraps there is this option,

showing 1 through 15 of 27 replies

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