W
Waluigi
The diamond discs I have seen and look interesting aswell, read they need bedded in alot to get them to work and as it's DIY wouldn't get alot of use.
Where did you purchase them, seem some on eBay that look decent at £4.95 per disc so can select the grits you need.
Did you mean the grinding blade can cause chips?
A poor grinding blade will chip.
Being honest, I will cut a mitre in porcelain using a standard cheap Chinese blade and finish up with a Montolit STL fine blade......the only reason I think the sanding discs might be useful is if you’re inexperienced.
I have used them on the odd occasion for mitring though.
Yes, the sanding discs can be bought from the likes of eBay. So cheap that it’s worth finding out for yourself if they’re useful.