Put on your safety glasses, face shield and leather gloves.
Attach a 1/32-inch abrasive blade to the 4-inch grinder. Ensure that the wheel is on center and tightly secured to the grinder so it does not shatter from being out of balance.
Lower your face shield and press the trigger of the grinder to start spinning the abrasive wheel.
Align the spinning abrasive blade with the location that you need to cut the stainless steel sink and lower the blade to the sink's surface.
Slowly push the abrasive cutting wheel across the surface of the stainless steel sink, creating a score line. Continue pushing and pulling the abrasive blade along the entire line until you cut through the stainless steel sink.
Remove the abrasive cutting wheel from the grinder and attach the flapper wheel to the grinder after you have cut through the stainless steel sink.
Run the flapper wheel along the cut edge to remove the sharp edge left from the abrasive blade and dress the edge of the stainless sink.
Round the edges at the end of the cuts to eliminate snag hazards when you install the cut stainless steel sink.