Principle and Operation Of Gear Hobbing

Gear Hobbing

In this article, we will learn about Principle and Operation Of Gear Hobbing. Gear hobbing is a method of making gears using a cutter called a hob with a principal helical thread. On the helical thread, a number of grooves are cut parallel to the axis of the cutter and the cutting edges are formed.

Operation

The gear blank is fitted in a vertical arbor. Fitted in a rotating arbor. The Hob axis will be set to alpha angle size.

Now the cut teeth on the hob are parallel to the axis of the gear blank. The machining is done by moving the cutter rotating against the gear blank. Hob e gear blank rotates along with the worm and worm gear so that the teeth are cut in the gear blank.

The single start thread is hollowed out for a full round by a hob. A multi-threaded hob can cut multiple teeth in one whole round. If the diameter of the hob is greater than the thickness of the blank, you can cut all the teeth in one pass. Even if the gear blank is too thick or too many gear blanks are fitted, the blank should be machined by moving the hob down around.

Advantages

• Using a hob with a specific module, you can create gears with different numbers of teeth.
• You can use the same hob to cut spur gear and the helical gear.
• The worm gear can be easily created only in hobbing mode.
• The size and shape of the gear teeth are perfect.
• Gear blanks can be machined simultaneously.
• A low-skilled operator is sufficient because this process is automatic.

Limitations

• Internal gears cannot be made.
• Shoulder gears and cluster gears cannot be created.