{"id":3625,"date":"2026-03-30T04:59:16","date_gmt":"2026-03-30T09:59:16","guid":{"rendered":"https:\/\/www.emag.com\/blog\/en\/?p=3625"},"modified":"2026-03-30T04:59:16","modified_gmt":"2026-03-30T09:59:16","slug":"high-precision-complete-machining-of-wave-generator","status":"publish","type":"post","link":"https:\/\/www.emag.com\/blog\/en\/high-precision-complete-machining-of-wave-generator\/","title":{"rendered":"High-precision complete-machining of Wave Generator for Harmonic Reducer on the VLC 350 GT"},"content":{"rendered":"

Wave generators are central drive elements in\u00a0strain wave gears, which are used in robotics in particular due to their high reduction ratios and compact design.\u00a0The\u00a0component\u00a0consists of a ball bearing with an elliptically shaped outer ring, which is mounted on a\u00a0shaft\u00a0and typically acts as the input side of the gearbox.\u00a0<\/strong><\/p>\n

Producing\u00a0these components presents\u00a0significant technical challenges for\u00a0manufacturers: The required shape tolerances in the single-digit\u00a0micrometre\u00a0range combined with complex elliptical geometries and thin-walled structures require specialized manufacturing strategies and\u00a0highly capable\u00a0machine tools.\u00a0<\/strong><\/p>\n

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\"Two

Precision component of a strain wave gearbox. The wave generator transmits the elliptical motion to the flexspline and requires \u00b5m-precise machining.<\/p><\/div>\n

<\/h3>\n

Manufacturing\u00a0Challenges<\/h3>\n

The machining of\u00a0thin-walled, hardened and tempered workpieces with elliptical geometries leads to several challenges:<\/span>\u00a0<\/span><\/p>\n

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  1. Workpiece deformation due to clamping forces\u00a0<\/span><\/b>Thin-walled structures tend to deform elastically under clamping force. With the required tolerances of 3\u00a0<\/span>\u03bc<\/span>m, even minor clamping force influences lead to dimensional deviations that are outside the specification.<\/span>\u00a0<\/span><\/li>\n
  2. Process-related heat generation\u00a0<\/span><\/b>The\u00a0grinding of tempered materials (HRC 40) generates considerable process heat, which can lead to thermally induced shape deviations.<\/span>\u00a0<\/span><\/li>\n
  3. Geometric complexity\u00a0<\/span><\/b>The\u00a0elliptical shape requires a continuous interpolated path movement between workpiece and tool.\u00a0<\/span>Conventional\u00a0cylindrical\u00a0grinding\u00a0processes\u00a0cannot\u00a0be\u00a0used\u00a0here.<\/span>\u00a0<\/span><\/li>\n
  4. 4.\u00a0Process chain dependency\u00a0<\/span><\/b>With\u00a0sequential machining in several setups, the reference surfaces (bore\/ O\/D (Outer Diameter)) and the elliptical contour must be produced in different process steps, resulting in tolerance chains and the required symmetry\/concentricity cannot be reliably achieved.<\/span>\u00a0<\/span><\/li>\n<\/ol>\n

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    Process\u00a0Strategy: Complete-Machining in a\u00a0Single\u00a0Setup<\/h3>\n

    Basic\u00a0Principle<\/span><\/b>\u00a0<\/span><\/p>\n

    The solution to these manufacturing challenges\u00a0is\u00a0the\u00a0complete-machining\u00a0of all functionally relevant surfaces in a single setup. By integrating turning,\u00a0milling\u00a0and grinding operations on one machine tool, the following advantages\u00a0can be achieved:<\/span>\u00a0<\/span><\/p>\n