For 3/4" Oak, you need a much higher speed than the slowest speed. Make sure you have a high tension. You want to hear a high "ping" when you pluck the blade. To make a sharp inside turn, try this, cut just to the corner, then back out just a little. Go back into the corner widening the kerf by the with of the blade. Now the kerf is wide enough to turn the blade easily with out cutting. Line up the blade with the line, and your off!