How to stop this cutting problem

[Slippery]

I'm cutting 10mm thick porcelain and have cut three tiles this morning (600mm) and all three have chipped.
How can I stop this happening?

 

[Wishiwasatoptiler]

I had similar the other day with my sigma, 600x300 porcelain, put it down to not applying even pressure across the whole score as it occurred only near the edge and that seem to fix it, maybe one of the other lads with more sigma experience and help us both.

 

[Dumbo]

Have you tried taking it out and snapping over your leg.

 

[Flintstone]

Common problem which I’ve never managed to find a reason to. But as above, if the cut is big enough, snap it over your leg or put it on a flat surface with a nail or alike under the score line at one end, only a bit and push down on the tile

 

[Wishiwasatoptiler]

Your right there, it was only when I was cutting the long length it happened, I'll give that a go next time. Cheers fellas

 

[Bill]

Where are you trying to actually snap the tile?....too close to the end can result in chips like this.

 

[Wishiwasatoptiler]

My chips, not as severe as Slippery where at the end near the ruler guide, snapping at the opposite side

 

[Italy]

you have to crush 2 cm from the metric bar,
not on top of the other side

 

[Time's Ran Out]

Scribe as usual ( better on a Rubi) and tap the back with a toffee hammer!

 

[Andy Allen]

Had this a few times from what I have found out is it's due to the tiles being over fired which makes them brittle, another batch of the same tile may cut perfect with no issues...

 

[WetSaw]

Is the bar adjusted evenly?

 

[One Day]

As Antonio says, break 10-20mm from the tile edge.
Also helps (with "sensitive" tiles) if you nudge the tile away a few mm up from the measure bar before breaking.
And make sure there are no bits of rubbish under the tile, clogging up the spring beds in that area.
I also find that on longer tiles, a little backward score - say 50mm, before scoring forwards can help a clean break.

 

[Dumbo]

As Antonio says, break 10-20mm from the tile edge.
Also helps (with "sensitive" tiles) if you nudge the tile away a few mm up from the measure bar before breaking.
And make sure there are no bits of rubbish under the tile, clogging up the spring beds in that area.
I also find that on longer tiles, a little backward score - say 50mm, before scoring forwards can help a clean break.

I back score every tile

 

[One Day]

I back score every tile

It seems many /most do.
I'm lazy!

 

[Slippery]

Well as is common, as soon as I had posted the question I found the answer!
It seems on the last couple of jobs using smaller tiles I have begun to start crunching the tiles from the far side of my cutter instead of at the measure side, when I realised what i'd been doing and started doing it PROPERLY, I had no further troubles. (silly b*gger)

Thanks for the responses 😉

ps what do you mean by back score @impish?, make a deeper score?

 

[Dumbo]

It's to make sure you score that first bit of tile properly . Put your handle 50mm past the near edge of the tile then score back towards you before you do your normal score.

 

[dynamictiling]

Old machine.

My old sigma cuts porcelain like this. My new montolit cuts them perfect.