Tiles chipping

[Stevetiler]

Hi all , having trouble cutting Borneo blue tiles from porcilanosa without chipping , not cutting to bad with sigma dry cutter but chipping with wet cutter ! Tried with dewalt d2400 and sigma 9b !!
any ideas ?

 

[Rizzle from the Portizzle]

scribe with sigma first then wet cut to side of scribe so the chipping cant travel over

 

[Stevetiler]

Cheers Ray , I've been doing that , still chipping only small chips round chrome trim when grouted can hardly see it but customer is very fussy !! The glaze on tiles it super thin also tiles are bowed 900x300