Why Gears Need to be Chamfered
Tuesday, September 18, 2018

The chamfering and deburring of gears is often an undervalued process in gear production which holds a rather high importance and priority in the eyes of the professional.

However, it has a rather strong and positive influence on the basic characteristics of usage and application of the work piece. Improvements in ratings are happening on a daily basis as for gears in vehicles, it also depends on the technique or process employed for this operation. Following are a few parts we wanted to explain in regards to the sophistication required in tools. Especially in case of tools that use plastic deformation for chamfering. Also tools that tend to promote the process of rolling and cutting for deburring.

Gears need to be maintained regularly calling for them to be chamfered and deburred with a controlled, high quality process. This is usually done in this unique way for the following reasons:
  • To avoid breakage: Excessive carburizing along the tooth edges can often cause breakage when the gear is running
  • To avoid damaging gears and bearings: If burrs are not removed, they may chip off during the running cycle and cause damage to the other gears and bearings.
  • To avoid poor tool life in the finishing processes
  • Removal of very sharp burrs reduces the risk of tool handling injuries.
Chamfering GearsChamfering of Internal Gears

Chamfering plays a rather critical and important role within the gear production process. The process occurs after the process of soft machining which is delivered to the edges of the teeth. With chamfering, the sharp edges along the work piece faces are eliminated. This allows for a shaping potential for a defined edge shapes that can be realized. Generating a chamfer can be because of multiple different reasons. For example, to avoid any weakening in the edge area during heat treatment or to improve assembling processes for spline gears. Furthermore, a chamfer can increase the life of the hard finishing tools on the following manufacturing processes. Especially honing tools can react very sensitively due to stock deviations around sharp edges.


Different chamfer types for gears are possible and are usually designed as per the requirements stated. The shapes can be made parallel to or along the tooth height of the gear in question. A chamfer can be embedded along the full gap of the gear, including the tooth root area or just along the tooth flanks. The picture above shows chamfer types of gears that are common nowadays.

The New Generation

With the latest introduction of top notch chamfering tool for internal gears, the benefits of a chamfering tool can be used for these types of gear as well.

This new pressure-type chamfering tool has a dedicated tool profile and offers a high-production chamfering process. The tool design will be carried out specifically for the workpiece and in close collaboration with customers.

For more information on use and to purchase a chamfering device, contact JF Berns.


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I have had the pleasure of dealing with the JF Berns Company for over 30 years now... For the first decade as a customer and for the last two decades as a supplier. Joe Berns is one of my favorite family businesses in the entire Midwest.

Greg Knox / Knox Machinery



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