The pitch circle diameter (PCD) of a gear is a vital measurement when using gears. When you mesh two gears together, the teeth need to mesh to a precise distance, if too deep then the teeth will bind and wear, too shallow and you will get excessive back lash and risk damage to the teeth.
Burping gas that smell strongly of rotten eggs is actually indicative of the presence of sulfur in our stomach. This is the reason why this type of burps is commonly known as sulfur burps. The smell of sulfur burps or rotten egg burps usually comes from the presence of hydrogen sulfide.
Foods you take may cause the release of the egg burp. If you are experiencing frequent egg burps, reduce the intake of foods like eggs, poultry, red meats, bananas, avocado, tea, and coffee, vegetables like onions, garlic, cabbage, broccoli, and parsley.