Post #291986 by Paipo on Wed, Mar 14, 2007 10:45 PM

The problem with the little spheres is they tend to catch on any inconsistencies in the stone if you try and do linework. It's hard to get a flowing line - so you get lots of little bumpy divots (unless the stone is very soft). The smaller the sphere (and you're using the smallest) the worse it gets. D1 burrs are also highly prone to breaking when used in this way.
For the sort of engraving you're doing you're probably better off using this type (artist impression):