WSM-420 Wheel Set Measurement System

The Simmons Wheel Set Measurement System (WSM-420) is a metrology machine that automatically inspects used railroad wheel sets to determine if the wheel set must be demounted, or if it can be re-profiled and returned to service.

The machine measures wheel diameter and width, flange thickness and height, wheel rim thickness, deviation of measured wheel profile from standard profile, wheel back-to-back, depth of flat spots on wheel tread, and depth of grooved wheel tread. The WSM-420 calculates the amount of material that must be removed to restore the wheel profiles to the nominal profile, and determines if the wheel rim will be thick enough to return the wheel set to service after reprofiling.

Railroad wheel set measuring system

Wheel sets are delivered to the WSM-420 via shop rails and once captured, the measuring arms are automatically positioned against each wheel tread. The wheel set is rotated while the wheel profiles are measured. The measurement results for both wheels will be displayed on local HMI and saved to the database. The control system determines if there is sufficient material remaining on the tread for further machining.

Machine Specifications

Download the WSM-420 Wheel Set Measurement System product data sheet — for the full machine specification, please contact the Machine Sales team.

Wheel Diameter

+/- 0.020 in. | +/- 0.5 mm

Flange Thickness

+/- 0.020 in. | +/- 0.5 mm

Flange Height

+/- 0.020 in. | +/- 0.5 mm

Rim Thickness

+/- 0.020 in. | +/- 0.5 mm

Wheel Back-To-Back

+/- 0.020 in. | +/- 0.5 mm

Depth of Flat Spots

+/- 0.020 in. | +/- 0.5 mm

Wheel Profile Deviation

+/- 0.020 in. | +/- 0.5 mm

Wheel Width

+/- 0.020 in. | +/- 0.5 mm

*Applicable up to maximum ambient temperature change of +/- 18°F (+/-10°C)

Electrical Power

 22 kW

Compressed Air

15 scfm @ 80 psi

Maximum Wheel Diameter

42 in.  |  1067 mm

Minimum Wheel Diameter

28 in.  |  711 mm

Maximum Axle Length

90 in.  |  2286 mm

Maximum Weight

 4000 lbs.  |  1820 kg

We're here to help

The NSH USA Customer Service Center (CSC) is here to support you and your machine. As the original equipment manufacturer (OEM), we are ideally suited to keep your machine productive and operating safely.

We offer:

OEM Spare & Replacement Parts
New or Upgrade Services
Service & Inspections

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