How to get good cuts with a stone chisel?

[Julistormen]

Hi, I have regular stone tiles of the cheaper kind from Bauhaus. I want to cut a 45-degree angle, but as soon as I start cutting, they break on the other side or in the middle... never where they're supposed to break.

How do you do it?

(Don't have an angle grinder, please don't suggest that )

 

[Farstatjej90]

I don't think it's stone, but those slabs are probably concrete. Is it the same to chisel?

 

[Karrock]

An image helps a lot to understand what you have and want to achieve.

Generally: Score hard on both sides where you want it to crack. Then tap lightly along the line with a chisel to create a break line. Then place it on a support and tap a little harder along the line. You can't expect both pieces to be usable, you might need to sacrifice one and work your way toward the line.

If they are cheap concrete tiles, they contain so much sand and little cement that it's practically impossible.

 

[Julistormen]

Yep probably, so it's just a matter of cutting then?

 

[z_bumbi]

You can try to carve a deeper groove with less force and move along the groove between strokes before attempting to crack something or simply chop the board apart.

 

[Kurtivan]

Try diamond blade on the cutting grinder.

 

[Julistormen]

A picture helps a lot to understand what you have and want to achieve.

In general: Score hard on both sides where you want it to crack. Then gently tap in that line with your chisel to create a break indication. Then place on a support and tap a little harder in the line. You can't expect both pieces to be useful, you might need to sacrifice one and work your way toward the line.

If they are cheap concrete slabs, they have so much sand and so little cement that it's practically impossible.

Should the base be hard? Placed on the grass now, chipped on both sides, went better!