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Two important principles in gearing are pitch surface area and pitch angle. The pitch surface of a gear is the imaginary toothless surface area that you would have got by averaging out the peaks and valleys of the individual teeth. The pitch surface of an ordinary gear is the form of a cylinder. The pitch angle of a gear is the angle between the encounter of the pitch surface and the axis.

The most familiar kinds of bevel gears have pitch angles of significantly less than 90 degrees and therefore are cone-shaped. This kind of bevel gear is named external since the gear teeth stage outward. The pitch surfaces of meshed external bevel gears are coaxial with the gear shafts; the apexes of the two surfaces are at the point of intersection of the shaft axes.

Bevel gears which have pitch angles in excess of ninety degrees possess teeth that time beval gearbox inward and so are called internal bevel gears.

Bevel gears that have pitch angles of exactly 90 degrees possess teeth that point outward parallel with the axis and resemble the factors on a crown. That is why this type of bevel gear is named a crown gear.

Mitre gears are mating bevel gears with equivalent numbers of teeth and with axes at right angles.

Skew bevel gears are those that the corresponding crown gear has teeth that are directly and oblique.