Although many gears “as cut”, either hobbed, planned or shaped are entirely satisfactory for their intended application, for others an additional finishing process is either necessary or desirable. All the mechanical finishing processes in common uses are intended to amend tooth shape by making the flanks confirm more nearly to the true or modified involute desired and to improve surface finish and tooth spacing. The following processes are generally used for finishing of gears:
1. Gear shaving or burnishing
2. Gear grinding
3. Gear lapping
4. Shot blasting
5. Phosphate coating
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