confovisMeasurement systemsLEADinspect


Norm-compliant analysis of macro lead and micro lead

With LEADinspect, macro lead and micro lead are analyzed in one system. The user thus obtains a quantitative and visual evaluation of lead structures (lead analysis) which could previously only be recorded using the thread method. Data about the stochastic arrangement of roughness elevations (roughness measurement) on the surface are also obtained. The distribution of these roughness elevations influences the service life of a radial shaft seal and thus determines the suitability of the surface as a sealing surface. The shell surface is also scanned by flat measuring fields, which allows an evaluation of the direction and volume of conveying structures (micro lead). Macro lead is evaluated according to the current version of the Daimler standard MBN 31007-7, whereby the system provides 72-line scans. In addition, LEADinspect can measure roughness according to DIN EN ISO 4287, 13565 and 25178 and analyzes the dominant waviness in accordance with VDA 2007.

LEADinspect – Measurement tasks

Macro lead according to MBN 31007-7

Micro lead according to IMA method


Volume and function parameters

Dominant waviness according to VDA 2007

Surface analysis with LEADinspect

  • Short measuring times thanks to area image capturing
  • Lateral resolution: less than 0.25µm; height resolution according to VDI 2655: less than 3nm
  • Image field size of 630×630µm enables high-accuracy quantitative statement about the conveying structures of the surface and a visual statement about the surface condition.
  • Analysis of macro and micro lead in a single measuring system
  • When analyzed according to Daimler standard, the macro lead results correlate with the results of tactile measuring systems
  • Micro lead measurement: 18 circumferential and 3 axial measuring points are scanned and analyzed (totally 54 measuring points on 630×630µm)

LEADinspect in application

Fast and precise analysis of demanding surfaces

In the past, it was common practice to determine the micro lead by the thread method, whereby the results were documented over the distance of the thread in relation to time. It was not possible to determine the structures that set the thread in motion. Besides, the service life of the shaft sealing system could not be determined since no information as to the stochastic distribution of the roughness elevations was available. Ultimately, several measuring instruments had to be used for macro lead analysis, topography and roughness measurement; a holistic evaluation of the surface was only possible to a limited extent. With LEADinspect, roughness, stochastic distribution of roughness elevations, surface damage, macro lead and micro lead are scanned and evaluated in a single measurement. The data are available to the user in a form that can be used for later correlation investigations with endurance run evaluations and returns from the field.

Bisher war es üblich den Mikrodrall durch die Fadenmethode zu bestimmen, wobei eine Dokumentation der Ergebnisse über die Laufstrecke des Fadens in Relation zur Zeit erfolgte. Daher waren Aussagen, welche Strukturen den Faden in Bewegung versetzen, nicht möglich. Auch konnte die Lebensdauer des Wellendichtsystems nicht bestimmt werden, da keine Aussage über die stochastische Verteilung der Rauheitserhebungen getroffen werden konnte. Letztlich mussten mehrere Messgeräte zur Makrodrall-Analyse und Topografie- und Rauheitsmessung eingesetzt werden, eine gesamtheitliche Bewertung der Oberfläche war nur eingeschränkt möglich. Mit dem LEADinspect können Rauheit, stochastische Verteilung der Rauheitserhebungen, Oberflächenbeschädigungen, Makrodrall und Mikrodrall in einer Messung erfasst und ausgewertet werden. Die Daten stehen dem Nutzer in einer Form zur Verfügung, mit denen spätere Korrelationsuntersuchungen mit Dauerlaufauswertungen und Rückläufern aus dem Feld durchgeführt werden können.

LEADinspect: Product versions

The LEADinspect measuring system combines high-precision measuring technology with a robust design (vibration damping base and granite machine frame) and can operate directly in production environments. Samples up to 350 mm flight circle diameter, 1000 mm length and up to 70 kg weight can be measured without contact.  Smaller systems are also available.

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