Certified Testing Equipment / 3D-CMM Measurements from Hofmann

Every balancing machine is a measuring system and must be inspected regularly. With our certification service, we ensure that your calibration rotors, master rotors and test weights are within required specification and tolerance. This means that you can always rely on the precision of your balancing machine.

NEW: Extended Accreditation according DIN EN ISO/IEC 17025:2018 for unbalance and vibration velocity measurement

Hofmann has been granted an extension of its accreditation in accordance with DIN ISO EN 17025 by the Deutsche Akkreditierungsstelle (DAkkS) as of January 2024. (Download Certificate).

The advantages for our customers are as following:

  • In addition to the existing accredited measurement parameters of geometry, mass and unbalance determination of working standards, the unbalance measurement on balancing machines and the measurement of vibration velocity can now be covered as additional accredited parameters.
  • Personnel specially trained in accordance with ISO 17025 specifications carry out standard-compliant metrological testing of the entire balancing machine and sensor system at Hofmann and on site at our customers' premises.
  • The vibration sensors of the balancing machine can be checked via an accredited test in accordance with ISO 17025 specifications.
  • Conformity assessment of the balancing machine based on the ISO 21940-21 balancing standard and the VDA 5 test specification.
  • Conformity assessment of the master rotors and test weights continues to be based on the ISO 21940-21 balancing standard
  • Increased confidence for the consumer with greater legal certainty
  • Fulfillment of quality and customer requirements

Hofmann owns a DAkkS (German instiute for ISO/IEC 17025 standard) calibrated 3D-CCM machine from Wenzel with a accuracy of 1.6 µm, an air-conditioned measuring room (class 2) and several DAkkS calibrated scales. The measuring staff is trained according to AUKOM standards with long term experience. All processes are described in a quality handbook.

Hofmann is offering their expertise for calibration of your test rotors, weights or even other 3D measurements.

Direct contact to the Hofmann certification service:
Tel.: +49.6157.949.327
Fax: +49.6157.949.100

Certified testing equipment – the technical control for your calibration and master rotors

To ensure that balancing machines and devices operate in a reliable and traceable manner in the long term, we offer you a continuous annual re-certification of your testing equipment. That consists of calibration or master rotors with the associated testing and calibration weights.

Re-certification of master parts. Are you wondering if your calibration rotor or master rotors are still suitable for inspecting your machine? To ensure that you are prepared for the next audits, Hofmann will take over the regular re-certification of existing and new parts used for the testing of balancing machines.

Production of certified master parts. Hofmann offers master parts according to individual customer requirements in the following designs:

  • Standard calibration rotors as per DIN ISO 21940 – 21 and SAE ARP 4162
  • Master rotors from modified original parts
  • Master rotors similar to original parts
  • Test weights, incl. special designs such as bob weights for crankshafts

As part of the certification / re-certification, Hofmann provides:

  • Geometric measurement of the rotor
  • Checking of the residual unbalance and re-balancing if required
  • Checking of the calibration weights

Reminder service. You don’t have to worry at all about your re-certification. Hofmann offers comprehensive re-certification management including a personalized reminder service.

3D-CMM Measurements as Service. Hofmann offers high precise geometrical 3D measurements of your parts, from rotationally symmetrical components to complex ones Free-form surface measurement based on a CAD model. The parts for testing may be prototype parts or serial production parts. Every measurement includes a report with environmental conditions, results, accuracies and a method description. You are facing with a critical measuring task? We solve it! Feel free to contact us!

Weighing & 3D Part Measurement in the Grade 2 Measuring Room in Pfungstadt (according to VDE 2627)

Do you have questions regarding the shape and position tolerances of your products? We offer reliable and precise measurement with fast turn around service. This includes the measuring and weighing of production parts and master parts, a comprehensive document management including report creation according to customer request and the traceability of measurement results. To ensure this quality, we rely on high-precision measuring technology:

DAkkS 3D coordinate measuring machine of the type Wenzel LH 87

  • Measuring range: X = 800 mm, Y = 1000 mm, Z = 700 mm
  • Accuracy: (1.6 + L/350 mm) µm L = measured length in mm
  • Probe: Mitutoyo Renishaw PH10M Plus
  • Scanning measurement possible
  • Software: Quartis R15

DAkkS-calibrated scale Sartorius Secura 224

  • Mass up to 220 g
  • Accuracy: 0.1 mg

DAkkS-calibrated scale Satorius SIWAEDG 3

  • Mass up to 32 kg
  • Accuracy: 0.5 g