Anyway, one of our steady items that we engrave daily are Toasting Flutes for weddings. Typically, it is a 2 line engraving with the Bride and Groom names as well as wedding date. The contrast of the engraving is very elegant and looks very classy on the flutes. The frosty white engraving makes for a great keepsake and we get many compliments on this style of flutes.
As engraving goes there are lots of things to consider when lasering toasting flutes. Diameter of glass, thickness of glass, font choice, and focal length are all critical. Most cups, tumblers, coffee mugs, and flutes get clamped down to the rotary attachment for engraving. On these flutes however we have found that gravity works great and does a superb job. The 2 things I would tell other engravers to make sure of when lasering toasting flutes is to always re-focus the laser after EVERY glass. You would be surprised how different each and every glass is. The focal length is super important. The second thing is to make sure that your laser beam is as perpendicular as it can be to the surface of the glass to give you the engraving that you are expecting. The depending on the curvature of the toasting flute this can sometimes cause issues.
We used a Speed 30, Power 100 on our 40 Watt Zing.