ART OF STAINED GLASS
Grinding is done in order to even out the vertical edges of the glass. When the vertical edges of the glass are even, the foiling will naturally be more even as well, leading to more even lead lines. Routine grinding is done with a 3/4" grinding head. A larger diameter grindig head is useful when grinding repetitive, straighter pieces. A smaller one, such as 1/4" is terrific for rich details and tight curves. Mass-produced stained glass rarely shows any signs of the kind of precision grinding that can be achieved with this smaller grinding head. Hobbyist who are not in a rush and care about making a high-quality end product can greatly benefit from using both a 3/4" and a 1/4" grinding heads. It possible to install both together on many shafts.
One of many ways to set up your grinder at home:
After cutting, glass edges are shiny, sharp-edged, and not perfectly straight:
After grinding, glass edges are matte, dull-edged, and much straighter:
The beginner project, after grinding. Note that what is on top is actually what will be, functionally, the underside of the project: