Usage of Multi-cutter (GOP) to remove cement joints

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Floorer / Paver / Tiler
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Hey,

I am looking for a tool to remove cement joints between ceramic tiles.
Concerns an outside terrace of approx 45m2.

A grinder does not seem appropriate in order not damage the ceramic tiles.
The Bosch Multi-cutter (GOP xx) should do it, I assume, though not sure and second thoughts on
* the right tool and accessoires
* time it will take

Any advice ?

Kind Regards, Wim
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Joinery installation in the broadest sense
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Hi Wim.
Are you sure the joints are cement - I suppose it's a possibility if they're outside.
There are a handful of grout removal tools for the GOP. At one end of the scale your have the 2608661642 RIFF attachment. Pretty useful for small areas. At the other, the AVZ 70 RT. More hardwearing and more longevity but, also more expensive. Both make grout removal pretty easy.
I will say though that I have tried using the RIFF attachemnt before to try and clean out a crack in a concrete and epoxied floor. It seemed to really struggle with the concrete to the point I reached for an Arbortech All Saw (overkill but done in a jiffy ;)). That was a particularly tough concrete mix in a tanked room so might not be an issue for your exterior tiles.
Do you have a mate with a multitool that you can try on a section before you make a purchase?
Another option would be a mini grinder 115/125mm with a masonary blade with the Bosch GDE 125 EA-T extraction hood or the FC-T version which has wheels and is a bit more expensive. With this attachment not only can you attach dust extraction (if you haven't got a Bosch vac, just gaffer tape the hose of your normal vac in) but you can set a cutting depth and also use the line guide on the front - all of which make for pretty clean and accurate grinding compared to free hand.
Hope this helps.

 
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1997
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Machine construction
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The main parameter is joint width. The wider, the easier to choose the blade and the easier to avoid damaging the tiles' edges.

For 1,5 mm joints, only Fein makes super expensive diamond blades for the oscillating GOPs… as in 50 EUR per blade. And it wears down quickly.

If your joints are wide, a much cheaper option is an angle grinder with a ceramics / stone cutting diamond disc. But it's trickier to control and get into corners.

This post was edited by AnatolyIVANOV on 09.11.2021, 03:37 o’clock
Reason: Expanded work in corners