Gear Shaving

Gear shaving is basically a finishing operation. This takes place after the operations of roughing with a hob or cutting with a shaper cutter is over. The Shaving process consists of the removal of tiny particles of metal from a gear teeth's working surface. Gear shaving produces fine hairlike chips. The cutter comes in the form of helical gear. It has special serrations in the flank area of a gear teeth. These serrations act as the cutting edges.

Advantages
Gear Shaving gives the gear the following advantages:

• Improves tooth surface finish.
• Eliminates, the problem of tooth end load concentrations.
• Effective reduction in the noise of gears with modification in the tooth profile.
• Increase the gear’s load capacity Improved safety and service life.
  
  
  

Types of Shaving Cutters
There is a wide range of available shaving cutter types:

• Transverse Shaving Cutters
  The gear that is shaved reciprocates in the direction of its own axis. The tool and the gear are in mesh. With each step of reciprocation, there is an occurrence of small quantity of radial feeding of the shaving cutter. For a clean shaving of the edges it would be useful to calculate one extra stroke per module. However, this method is not suited to shaving shoulder gears.
  
  
  
• Diagonal Shaving Cutters
  Here the gear selected for shaving reciprocates obliquely in direction to its own axis. The gear and the tool are made to stay in a mesh. The diagonal angle can be got by positioning of the workpiece table in an oblique manner or by the process of interpolating of the two machine axes. As with each reciprocation, there is a radial feeding of the shaving cutter. This is described in the diagram:
  
  
  
• Plunge Shaving Cutters
  In this method there is no worktable translation. Instead there takes place a radial feed of the workpiece against the tool that is used as shaving cutter. Plunge shaving is particularly good for shaving of shoulder gear.
  
  
  
• Underpass Shaving Cutters
  Underpass shaving is primarily identical to diagonal shaving with a small variation in the form of a diagonal angle of 90 degrees. In underpass shaving no axial table reciprocation takes place. In its place, the workpiece reciprocates at right angles to its own axis.