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Old 09-11-2017, 10:18 PM   #1
nbanta
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Removing grout from really thin joints

I need to remove grout from extremely thin joints in a shower ceramic tile wall. The joint widths are mostly right at 1 mm (approx. 0.039 inch; less than 3/64 inch). The oscillating steel blade that came with my Ridgid Jobmax fits in the joints, but you can guess how long the teeth on that blade lasted. And it wasn't doing much to the grout even before the teeth got ground down to little nubs. This grout is pretty hard, and a utility knife just doesn't do the job. So I'm looking for a diamond or carbide blade that is thin enough to get in the joints. Could be for an oscillating or rotary tool. Or for a handheld grout saw, for that matter, but I have to do the whole stall (4-inch tile), so I'd prefer to use a power tool.

The thinnest blade I've found is a 3-inch Fein Starlock Segmented Diamond 216 saw blade -- but the width is 1.2 mm and I'm afraid it would just ruin the tiles.

I'm sure I'm not the only one who has had this problem. Does anyone know of a source for such a diamond or carbide blade?
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Old 09-12-2017, 08:47 AM   #2
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If you are near a Harbor Freight, check their multi-tool diamond blades. Donít know how thick they are, but since it is Harbor Freight you know they will be using as little diamond as possible. My take was that they did not cut too well so they removed soft (not fully cured) grout easily without scratching the porcelain tile.

THK has some thin cutoff wheels. Not sure how you would use them. Or check their other products. https://www.thk.hk/online-cart-dtl.p...&ssid=0&id=424
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Old 09-12-2017, 10:20 AM   #3
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The thinnest one I'm familiar with is 1/16", which seems to be too wide for you.

You might just have to use the thinnest one you can find and do the best you can with it.
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Old 09-12-2017, 10:40 AM   #4
Lou_MA
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You'll need a dremel rotary tool. And I find the flexible shaft attachment handy. If you have a whole shower to do, I'd pick up 4 or 5 wheels just to have them handy. They wear out fairly quickly.


http://www.homedepot.com/p/Dremel-7-...-545/100346850
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Old 09-12-2017, 10:29 PM   #5
nbanta
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Larry, thanks for the suggestion about the THK wheels...maybe there's a way to mount that on an angle grinder?

Lou, that Dremel wheel looks like it might be my best bet. Blade thickness / kerf is 0.04 inch according to Dremel.

Does Dremel make a 90-deg head to improve the handling and ergonomics?
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Old 09-13-2017, 05:14 AM   #6
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The flexible extension is the better bet.
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Old 09-20-2017, 05:58 PM   #7
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I have used the Dremel MM502 blade on my oscillating tool on thin grout lines. It states it's for 1/16", but it seems smaller as other 1/16" makes were too big. If it's a large job, you may want to pickup a couple as they don't last very long.

https://www.amazon.com/Dremel-MM502-...+removal+blade
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