I'm tiling my bathroom floor with some large ceramic tiles (33cm x 33cm aka 13" x 13") and I'm having difficulty cutting them. I'm using a simple glass cutter, because the tile cutter for such large tiles is too expensive, and an angle grinder with a diamond disk gave a pretty dismal result (not to mention an absurd amount of noise).
The glass cutter worked like a miracle - for the first tile that I tried to cut diagonally (corner to corner). After that, it's the same problem over and over again:
I've scratched a pretty deep line with the glass cutter (even faintly visible in the picture), and I've positioned the tile-to-be-cut on top of an already glued tile on the floor. The scratch line matches the tile edge. Then I hit the corner with my fist to break it. And the result is in the picture.
In the middle it breaks as it should, but closer to the edges it ignores the lines. This is still salvageable with tile nippers (I need the big piece), but it's annoying. What am I doing wrong?