Using flexible angles of operation and adjustable force levels, bevel gears include the driving force of numerous of our mostly used machines. Without bevel gears, we would struggle to drive our cars, fly in helicopters, operate printing presses or do several mechanical tasks we miss. Angle of Intersection Bevel gears are placed on shafts that intersect in the axes, usually with a 90-degree angle. Teeth Bevel gears usually are cone-shaped, their teeth pointing outward. Some have teeth pointing inward and are called Internal Bevel Gears. Others have teeth pointing parallel using axis, and these these are known as Crown Gears. Straight Vs. Spiral A bevel gear's teeth might be straight and parallel to its face, or spiral-shaped and curving across the face. Spiral-toothed bevel gears experience an increasingly gradual transfer of force and so are thus quieter and smoother than their straight-toothed counterparts. Flexibility Unlike standard gears, bevel gears offer an adjustable angle of operation. You can tweak their force output, besides, through changing how many teeth. Practical Uses In automobiles, bevel gear allow the wheels on the vehicle to spin at different speeds, essential for turning corners. In hand drills, a vertical pinion and ring gear inside the handle spins the horizontal bevel gear attached to the chuck. Other bevel-based mechanical systems can be obtained from trains, cooling towers and power plants.