What does gear hobbing mean?

Hobbing is a machining process for gear cutting, cutting splines, and cutting sprockets on a hobbing machine, which is a special type of milling machine. The teeth or splines of the gear are progressively cut into the material (a flat, cylindrical piece of metal) by a series of cuts made by a cutting tool called a hob.

What is difference between gear shaping and gear hobbing?

Shaping is a more traditional gear cutting method where a “blank gear” (one that won’t be used for non-cutting purposes) is rotated alongside an incomplete gear as a template. The hobbing process works by using a hob to cut the grooves or teeth into a blank gear.

What are the benefits of gear hobbing machine?

The automated computers ensure an accuracy like none other. Free from human error, the hobbing process produces high-quality gears. Versatility: Gear hobbing makes it possible to manufacture spur gears and other types of gears, like worm gears, cycloid gears, and helical gears.

What are the three basic motions in gear hobbing?

The principal motions involved in rotary gear shaper cutting are: Cutting motion. Return stroke. Indexing motion.

What are the advantages and disadvantages of gear hobbing?

Advantages and Limitations of Gear Hobbing Process (c) The process has a larger variability’s in the following of sense as compared to other gear machining processes. (i) Capable to make a wide variety of gears like spur gear, helical gears, worms, splines, sprockets, etc.

Which gears can not be cut by hobbing process?

There is one glaring limitation of gear hobbing, that is the manufacturing of internal gears is not possible. Also, the manufacturing of bevel gears is not possible.

Which material is best for gears?

Thermoplastics are the best choice for gears where weight is the most important criteria. Gears made from plastics can be machined like metallic gears; however, some thermoplastics are better suited for manufacturing via injection molding. One of the most common injection molded thermoplastic is acetal.

What are the disadvantages of gear hobbing?

Disadvantages of Gear Hobbing machine :

  • Not adopted to generate internal gears.
  • Restricted adjacent shoulders larger than the root diameter of the gear.
  • Splines and serrations are not suitable for hobbing.

What is the limitation of gear hobbing?

One of hobbing’s only weaknesses is that it does not work for internal gears (with inward-facing teeth). However, there’s a related process called shaping that can be used instead—with all the same advantages of hobbing.

What is name of the tool used in gear hobbing process?

Gear-hobbing machines use a rotating, multiple-tooth cutting tool called a hob for generating teeth on spur gears, worm gears, helical gears, splines, and sprockets.

Which of the following is fastest method of cutting gears?

Broaching is the fastest method of machining gears and is performed using a multi-tooth cutting tool called a broach. Each tooth on the broach is generally higher than the preceding tooth. As a result, the depth of cut increases with each tooth as the broaching operation progresses.