Involute

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.