Home » A Guide To Gear Hob Cutters And Gear Hob Manufacturers

A Guide To Gear Hob Cutters And Gear Hob Manufacturers

by janeausten
Gear Hob Manufacturers

What Are Gear Hob Cutters?

The hobber uses a hob as a cutting tool to create teeth in the blank workpiece. Hobs have helical cutting teeth with grooves that span the length of the hob, and they are cylindrical in shape. These teeth aid in chip removal and cutting.

On a hobbing machine, a unique kind of milling machine, hobbing is a machining process for cutting gears, splines, and sprockets. A hob, a type of cutting tool, makes a series of cuts into the material (a flat, cylindrical piece of metal) to gradually shape the gear’s teeth or splines.

Hobbing is utilized for a wide variety of parts and numbers and is generally quick and affordable in comparison to most other gear-forming methods.

  • For the machining of spur and helical gears, hobing is particularly popular.
  • When internal gears are skived with a rotary cutter, a technique like the hobbing of exterior gears can be used.


A hobbing machine with two skew spindles is used for hobbling. A blank workpiece is fixed on one spindle, while the hob is held on the other. Depending on the type of item being created, a different angle exists between the spindle (axis) of the hob and the spindle of the workpiece. For instance, while producing a spur gear, the spindle is held at the hob’s lead angle, and when producing a helical gear, the spindle is held at the hob’s lead angle plus the helical gear’s helix angle. Straight, helical, straight bevel, face, crowned, worm, cylkro, and chamfering are the hobbing features for gears.

The number of teeth being cut into the blank determines how quickly the two spindles rotate; for instance, a single-threaded hob with a gear ratio of 40:1 requires the hob to rotate 40 times for every turn of the blank to produce 40 teeth. The speed ratio is multiplied by the number of threads on the hob if it has multiple threads. Once the proper tooth depth is attained, the hob is fed up into the workpiece. The hob is fed into the workpiece parallel to the axis of rotation of the blank to complete the operation.

Numerous blanks are frequently stacked using a proper fixture during mass manufacturing before being cut all at once.

Equipment used

Hobbers, also known as hobbering machines, are available in a variety of sizes to create gears of various diameters. Small tabletop machines are used to make tiny instrument gears, whereas massive industrial machines are used to make large-diameter marine gears. A hobbing machine typically includes a chuck, tailstock, spindle, and drive motor to install the hob and retain the workpiece.

The greatest module or pitch diameter that a hobbing machine can generate is one of its distinguishing features. For instance, a machine with a capacity of 10 in (250 mm) may produce gears with a maximum face width of 10 in and a pitch diameter of 10 in. The blank is positioned vertically on many hobbing machines or vertical hobbers. Splines on the end of a shaft are often cut using horizontal hobbing machines, which are typically utilized for longer workpieces.

Types of Hobs

  • Roller chain sprocket hobs
  • Worm wheel hobs
  • Spline hobs
  • Chamfer hobs
  • Spur and helical gear hobs
  • Straight-side spline hobs
  • Involute spline hobs
  • Serration hobs
  • Semitopping gear hobs

Gear hob manufacturers

There are many companies that make equipment, especially in India. The advancement of technology is a result of the rapid growth of the Indian IT industry.

India is home to numerous prominent manufacturers of gear-cutting tools. There is a diversity, ranging from large to little.

Produce a variety of spline hobs to standard and customized customer specifications. The automotive industry makes extensive use of these hob cutters. Additionally, create Chain Sprocket Hobs in accordance with customer specifications or drawings.

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