Involute

  • Gear Measurement

    Gear Measurement

    Manufacturers of gears and gear boxes make high demands on the quality of design, production and assembly of gears and gear boxes. The manufacturers need to rely upon precise measurement of deviations occurring during the production process. Especially in the field of gear production, gear machining and gear inspection are mutually dependent. It is not possible to adjust the gear cutting machines and to evaluate the tools without knowledge of the various gear tooth errors. Especially in the field of gear production, gear machining and gear inspection are mutually dependent.

    InvolutePro is such an efficient software package for the evaluation of spur toothed and helical gears with involute profile. This software allows you to reliably determine all toothing parameters (according to the common standards such as DIN, AGMA, etc.). In addition, derived classical dimensions, such as the measurement over balls (single or double) can be derived immediately from the internal data model.

    The measuring results are represented on modern, clearly structured and tried-and-tested measurement protocols. A modern solution for the integration in higher-order software environments is also available. Thanks to the automation interface (COM), InvolutePro can be integrated in any software, e.g. to ensure that the entire user interface can be exchanged.

    Involute has been present on the market for more than 25 years and has been used by many customers and manufacturers of coordinate measuring machines (CMM) throughout the world. Involute has been further developed over several generations of hardware and programming languages. This effort has always been successfully accepted by the market. One reason for this is the consequent customer orientation. We support our customers in integrating InvolutePro in existing software systems, reacting quickly to customer requests and adapting InvolutePro to already existing company standards.

    The gear evaluation with InvolutePro has been tested and certified by the Federal Physical/Technical Institute (German PTB).

  • Surface model

    Surface Model

    GearPro internally uses a new 3D model of the entire gear. This robust model makes it possible to carry out measurements without complex path control systems, because the tooth flank is always evaluated as a spatial surface and never as an intersection. As far as the machine accuracy is concerned, gear measurements are also possible with manually operated measuring machines.

    The basic idea of the surface model is to measure the tooth flank, comparable to any other form element (e.g. cylinder), with a sufficient number of points and to model it as a geometric substitute element via the best-fit calculation method. Based on the measuring points, the compensating flank surface or also the entire toothing (in the case of involute spline) is calculated via the compensating calculation method according to Gauss, minimum zone or circumscribed or inscribed conditions.

    From the parameters of the involute surface, all derived gear parameters (ball dimensions, span widths, pressure angles,….) can be calculated via the exact 3D calculation method. Furthermore, this considerably facilitates measurements of profile, tooth trace and pitch deviations.

  • Racks, worms, rotors

    Racks, worms and rotors

    Based on our experience regarding 3D evaluations of gears, we also developed special solutions for toothed racks, worms and rotors.

    In contrast to a standardized gear, the curve of a rotor’s screw surface to be generated is shown via a general mathematical model. To do so, a corresponding 3D substitute model is used to maintain the advantages of the gear evaluation also in this case.

    Within GearPro we provide you with an evaluation model for general types of screw surfaces which is based on the proven surface model. In this case, the geometry of individual teeth is no longer shown via a parametric model but via user-defined point sets. Flanks, tip and root areas as well as complete profile sections can be evaluated over several teeth.

    The deviations are calculated in axial, transverse and/or normal section according to your requirement. Additional parameters, e.g. for ball dimensions, lead, tooth thickness and tooth space, can also be output. Best-fit calculations enable the calculation of systematic deviations of the rotor from the nominal model as lead, radius or origin errors. It is not necessary to mechanically align the rotor. However, the axis of rotation must be set as Z axis of the coordinate system. Spatial stylus tip correction is performed.

    The results of the evaluation are stored for each measuring point together with surface parameters, the surface normal and the deviation in normal direction. This makes it possible to calculate any representation, such as axial, normal and transverse section. New innovative representation types are also possible.

    It is also possible to evaluate paired rotors, e.g. in screw compressors. The pairing is simulated to enable the calculation of continuous speed, play and gap dimensions over the entire profile and with different tooth assignments at any given center distance.

    The red line represents the “contact path” to the second rotor in a screw compressor.

    We are glad to answer your questions regarding any special evaluation requirements. Contact

  • Screenshots

    Screenshots

    Depending on the type of integration of InvolutePro in the software environment, it is also possible to define a specific interface. Alternatively, you can also directly predefine the basic gear data (nominal data) in a special XML format. These nominal data and the corresponding measurement data are evaluated via InvolutePro.

  • Integration

    Integration in existing software

    InvolutePro can be integrated as a single-station program as well as a module in the software environment of a CMM. The following integration methods are possible:

    • via command line parameters,
    • as automation server of as
    • COM library

    We will be glad to advise you regarding the selection of the most suitable integration method for your application and to support you in the use of InvolutePro. Contact

  • Requirements

    System requirements

    Current, commercial PC:

    • Windows 7 or higher
    • Microsoft XML 4.0 or higher, available from Microsoft free of charge (or in the case of Windows 7 already installed)
    • Microsoft .Net Framework 4.5
    • x86-Prozessor (corresponding to Intel Core i3, or higher)
    • Main memory 2GB or more
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