Leading the world in rotary measurement since 1940
Leading the world in rotary measurement since 1940
+44 (0) 1225 426206


Additional axis for any high accuracy Coordinate Measuring Machine

The QuadDualPurpose precision rotary axis have been specifically developed as an additional axis for any high precision Coordinate Measuring Machine to simplify the measurement of symmetrical or prismatic components including scanning applications by simplifying your measuring procedures, increasing your CMM’s application range and effective measuring volume which in turn increases the flexibility, productivity and efficiency of your CMM.

Typical applications that benefit from the inclusion of a 4th axis include the measurement of component parts characterised by symmetrical or recurring features such as gas turbine disc, fan blades, gearing and impellers.

The QuadDualPurpose capabilities deliver new levels of accuracy, flexibility and performance over a wide range of calibration and inspection applications.

Provides Reduced Measurement Uncertainty

The combination of sub arc second positioning accuracy and bearing geometry of less than 0.0005mm ensures the minimum impact on your process measurement uncertainty.

Reduced Inspection Times

Shorter setup times, increased flexibility and productivity, simplified stylus configurations and part programs, increased effective measuring volume of CMM.

High Loading Capacity

The cleverly designed bearing assemblies not only guarantees the highest precision available but a very high load carrying capability.

Proven Reliability

With over 500 installations worldwide the QuadDualPurpose has proven to be reliable over high duty cycles while operating in the shop floor environment.

The introduction of a rotary table enables the operator to make better use of the CMM’s available measuring range therefore providing greater flexibility in what can be measured.

Figure 1 shows the impact of larger components on the useable measuring volume of a CMM. Voluminous styli systems are usually required to measure a workpiece from all sides which means a large proportion of that useable measuring volume is required just to ensure collision free movement of the stylus around the part, the areas of the component within the red boxes are therefore inaccessible and cannot be measured.

Figure 2 demonstrates that as an alternative to increasing the physical size of your CMM and its associated useable measuring volume the introduction of a rotary axis allows you to measure larger components using smaller linear moves as indicated by the green box.

As a direct result of the introduction of the rotary axis a much simpler stylus system is required, measuring times are reduced, visibility is increased, programming becomes much more straight forward, and the smaller linear moves help to increase overall accuracy and reduce the influence from temperature.

The QuadDualPurpose features have been designed to help you get the job done.

Vertical and Horizontal Axis

QuadDualPurpose construction allows operation with its axis horizontal or vertical without any noticeable change in performance.

Low Profile Design

The rotary axis has been specifically designed with the lowest possible profile to minimise its impact on your CMM’s measurement volume.

Range of Sizes

Standard sizes range includes ø250mm, ø300mm and ø400mm.

Fully Integrated Solution

The QuadSlimLine has been designed to be fully integrated with your existing CMM control or via our third party Axia control.


Encoder Types

Various encoder types from Heidenhain and Renishaw can be mounted directly to the axis of rotation offering positional accuracies of +/-1 to +/- 0.4 arc seconds. Incremental encoder signals provide the control system with 18,000lpr to 180,000lpr at 1vpp or as standard TTL. Distance coded and absolute encoders can also be supplied to reduce datum time.

Service Indicator

A visible pre-set service indicator is installed.

Home Switch

A limit or proximity switch is fitted for use as a home reference in conjunction with the reference pulse of the encoder.

Don’t have a fourth axis on your CMM controller? Why not use the RPI Axia Control System

Features and Capabilities

• Digital servo controller for RPI products

• Closed loop brushless control

• Compatible with both mechanical and air bearing rotary tables

• Error compensation of encoded axes

• Automatic operation of axis clamps

• Remote operation via RS232 or Ethernet

• 19” rack and free standing enclosure options

Over 75 years of engineering heritage underpins our rotary innovation

Early FERRANTI Merlin CMM with R Series rotary axis supplied in 1977