Gear Finishing Processes Explained
Understanding the difference between gear manufacturing processes is key. Gear production involves two main stages: generating the basic gear shape (cutting/generation) and refining the surface finish and accuracy (finishing).
Identifying Finishing Processes
- Gear shaving: A finishing process that removes small amounts of material using a specialized cutter to improve surface finish and reduce noise.
- Gear lapping: Uses abrasive materials to smooth the gear teeth surfaces, enhancing precision and finish.
- Gear grinding: A high-precision finishing operation, often done after heat treatment, to achieve exact dimensions and superior surface quality.
Gear Hobbing Distinction
Gear hobbing is fundamentally a gear generation process. It uses a rotating cutter (hob) to cut teeth into a gear blank. While it creates the gear teeth, it is considered a primary manufacturing step, not a secondary finishing step.
Conclusion
Since gear hobbing creates the gear teeth from a blank rather than refining an existing tooth surface, it is classified as a gear cutting or generation process, not a gear finishing process.
Important Questions from Metal Cutting Processes
In a single-point cutting tool, the side cutting edge angle is
Which pair of following statement is correct for orthogonal cutting using a single-point cutting tool ?
P. Reduction in friction angle increases cutting force
Q. Reduction in friction angle decreases cutting force
R. Reduction in friction angle increases chip thickness
S. Reduction in friction angle decreases chip thickness
After which point of the Stress-Strain Diagram does metal cutting start ?
In order to cut 30 T gear, we use No. 4 cutter which is suitable for the range 26 T to 34 T. If helical teeth with helix angle α are to be cut, the size of cutter is given by
While machining grey cast iron
