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How wobble broaching works

Written by Mike Roberts. Posted in Gadgets

Rotary broaching or wobble broaching is different from the conventional broaching methods. While other types of broaching machines will push a sequence of polygon through a hole until it reaches the required size and form, rotary broaches complete the operation in one go without requiring any other secondary process. Wobble broaching is popular because if its ability to cut the desired form piece by piece at a very fast rate. It is a precise way of creating internal forms at an amazing rate, but it can also handle external machining very well. On high quality production runs, it is important to work with efficient and cost effective machines that will not only save time and money, but will also ensure the high quality of the workpieces. Rotary broaching has an exceptional accuracy of 0.0005″.

The components of a rotary broach


To achieve the wobble broaching process, you only require two components: the tool holder and the broach. The cutting tool or the broach is held at an angle to the axis of the work piece that will get cut. This small difference in angle causes the cutting tool to shear into the surface of the piece like a chisel until the desired shape and form is achieved. The tool holder will keep the broach in place, while the workpiece is rotating and the contact between the two results in a precise and clean cut. Unlike other broaching technologies, the rotary solution does not require an expensive machine to operate. You can use it on a milling machine or lathes with the same effect.


What forms can wobble broaching create?


This technology is not only popular because of its ability to create work pieces at a very fast rate with an incredible accuracy, but also because of the great number of forms it can create. The principle behind this type of broaching is simple, but highly efficient and practical, thus it has numerous applications. You can create hexagons, serration, keyways, involute, numbers, letters and squares. You can say that this precision machining can create any polygon forms without compromising the quality of the workpiece. You can broach any form in materials such as aluminum, plastic, brass and steel. Although these are the most popular materials, you can also use titanium, stainless steel and other similar materials as long as they have the appropriate size and depth. It is of course challenging to cut stainless steel with an ordinary broach, but it is manageable.


How to operate rotary broaches


Broaches are made of durable high speed steel to ensure they can handle any material. However, you need to operate your tool carefully to ensure it will last longer especially when using it on a high quality production run. You should always minimize the broaching depth and try to lessen the strain on the broach. Cut a little at a time and the broach will do its work. You should also align the broach tool with the work piece perfectly to ensure both your tool and the piece will not get damaged.