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Huaying Chuang Precision Machinery Co., Ltd. [Guangdong,China] Business Type:Agent , Distributor/Wholesaler , Manufacturer , Service Main Markets: Americas , East Europe , Europe , Africa , Asia , Caribbean , Middle East , North Europe , Oceania , Other Markets , West Europe , Worldwide Exporter:81% - 90% Certs:ISO9001, RoHS, GB

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Introduction of Micro Gear Cutting Method

2022-01-10

Gear hob hobbing is to use a hob to cut gears on a gear hobbing machine. During micro gear hobbing, the tooth profile of the hob must be micro-machined. Since the micro-gear has a very small tooth profile, in addition to the tooth profile error of the hob, errors such as tool tip runout, tool tip run-out, and circular motion will also occur, which seriously affect the accuracy of the micro-gear.

At present, the common micro gear processing method is cutting, and there are two methods for cutting, namely 5-face milling and 2-face hobbing. The 5-cut process requires multiple offset passes on a 3-axis CNC machine, while the 2-cut process can be achieved with just two passes on a more complex 5-axis CNC machine. While the 5-cut method has been used reliably for decades in the automotive industry, more and more factories are turning to the faster and less expensive 2-cut process.

Each cutting method for micro gears has its own unique geometry. A 2-cut gear will have ring teeth of consistent height and a tapered root width, while a 5-cut gear will have a higher outer diameter than the inner diameter with a constant root width. So, on a 2-tooth gear set, the micro gears only contact the ring gear at the center of the teeth, while the micro gears in a 5-tooth gear slide the entire length of the tooth flanks.

Cnc Gear Cutting Machine

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