I have always loved working with glass so coming from a stained glass background has been an advantage for me in my mosaic art. A lot of the tools I use in Mosaics I can also used in Stained Glass. I want to share with you a tool that I think is a "Must Have" for mosaic artists who need to achieve a smooth edge to their tesserae. I'm talking about a grinder. It is a tool I use on a regular basis and is so easy and fast.
First, safety always needs to be your top priority, so always wear some kind of eye protection. You never know when that small little piece will fly up in your face while you are grinding, so always wear glasses.
Two important things I want to mention:
First, Grinders come with Diamond grinder bits that have different grits for working on diverse ranges of tesserae. You can grind glass, stained glass, ceramic tile, porcelain, stone, slate, limestone, marble, and granite. You just need to order the right grinding heads that work for the materials that you will be using. I generally stick with a diamond bit that has a grit of 100-120 which works really well for smoothing and shaping the stained glass and glass tile tesserae I generally use.
The other important thing is that grinders have cooling systems that applies water to the grinding head for cooling and lubrication. Never grind your tesserae without water in the reservoir as you will wear out your bit really fast and it will kick up dust from your tiles; using water controls all that dust. So fill up your reservoir and I recommend purchasing a bottle of grinder coolant and add a capful right into your water in the reservoir whenever you change out your water. The coolant provides a smoother grind and extends the life of your grinder's diamond heads.
Now for the fun part.
Once you have cut out a piece of tesserae, there will be sharp edges so always be careful when handling it and, again, wear your glasses. If you want you can buy some inexpensive gloves to wear while grinding.
Place your fingers on top of the tesserae, hold it firmly and press gently against the bit. Move the tesserae back and forth – never hold your piece in one place, unless you are specifically wanting to remove a significant amount in one area. So, moving it back and forth will give you smooth lines and removes any sharp edges.
After you have the desired smoothness, wipe off with a dry clean cloth. You're ready to use your piece in your mosaic! So simple and easy and you'll be glad you have a grinder.
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