Quote Originally Posted by CraftyGeek View Post
When you say micro thin cutting disk..what thickness are they? I have some 2.5mm discs already...how would they do?
2.5mm are the older standard thickness cutting disks. Nothing wrong with them if that's what you already have.

Quote Originally Posted by Jonathan View Post
2.5mm is bad as it has to remove a greater amount of material, so the cutting force and wear on the grinder is higher and it's not as fast.
I wouldn't call them bad. They were used for many years as cutting discs.
And how does a thicker disc increase cutting force on the grinder?
You shouldn't be forcing the disc into the metal anyway, as all you do is cause extra heat, wear the disc quicker, and put unecessary strain on the grinder.