1. Put on a dust mask to avoid inhaling the glass dust that results from engraving glass with a grinding tool.
2. Secure an engraving template on the underside of the glass you will engrave. Your template can be a hand-drawn image or a stencil printed from the computer. For personalized items, type words in the font of your choice on a word processor and print. Tape is usually all you need to keep the template in place.
4. Remove the template and examine the glass. Using your tool, trace over the image again to get an even line. You may need to go over it several times, depending on the thickness you want for your image.
5. Wash the glass to remove any debris and allow it to air dry.