9. Before you reach the end of the your cutting, make sure there is something under the sink cutout so that it does not fall to the ground. Place a supporting device under it.
Finishing Undermount Sink Cutouts
1. Air or electric polisher
2. Zero tolerance bit
3. Alpha Ceramic 150 metal bond diamond (4-in. size)
4. Alpha Ceramic EX diamond pads in the following grits 200, 500, 1,000, 2,000, 3,000, buff (white and black)
5. Alpha 150 Metal Bond Ceramica pad
6. 4-in. flexible pad driver
1. Attach a zero tolerance bit to your air polisher.
2. Position the polisher and bit so that it is perpendicular to the inside rim of the sink cutout.
3. Turn the water on and start the machine. Make sure there is plenty of water supplied to the bit. You may have to supply additional water with a hose so that you do not burn up the bit.
4. Start working the bit by pressing it into the stone, working in a right to left pattern. Do not press too hard, and make sure your motions are smooth and not jumpy. Keep the bit positioned in a perpendicular position to the top; otherwise the rim of the sink will not be even.
5. Continue to work the bit until you have reached the marked line. This step is very tricky and requires lots of practice to get a smooth, consistent cut.
6. Work the zero tolerance bit until the entire line is even.
7. Once you are done with the zero tolerance bit remove it from the polisher and attach a 3- or 4-in. Velcro-backed drive pad.
8. Next, you will be smoothing the rim edge with the following diamond grits: 150-200-500-1,000-2,000-3,000-buff
9. Attach the 150-grit metal bond Ceramica diamond to the Velcro backer pad on the polisher. Turn the water on and begin smoothing the sink rim by working the diamond back and forth along the rim. This technique will also take practice.