Sigma Integrale – DK2 3 Actuator Kit Review By The SRG

Sigma Integrale - DK2 3 Actuator Kit Review By The SRG

Barry Rowland of the Sim Racing Garage presents his review of the DK2 3 Actuator Kit by Sigma Intégrale.

US-based Sigma Intégrale is a technology, research, and development company for the automotive and truck markets. The professional DK-2 motion system is a motion solution for sim-racing enthusiasts, racing professionals, and researchers.

The DK2 3DOF system is mechanically and electrically engineered around special software algorithms to provide the most realistic and representative motion feedback. All the elevation changes, vehicle movements, surface change,s, and gear shifts, are captured and reproduced within 2” (50mm) of the available mechanical stroke.

The Sigma Intégrale DK2 3DOF Motion System is available via the official website for $4,095.00 + shipping.

Official Webpage –

Sigma Intégrale DK2 3DOF Motion System


  • 100% designed, manufactured, assembled, and tested in California, USA
  • Utilizes the largest American-made ball screw and nut in the industry for maximum durability
  • Mono-block in structure using a CNC machined billet aluminum to ensure concentricity and accuracy
  • 2″ (50mm) in piston diameter for large side-loading capability
  • T-slot aluminum extrusion (80/20) friendly


  • PC side (Windows 10)
    • Game physics engine @ 333 Hz: 3 ms
    • Windows OS response: 1 ms average
    • Sigma 10-layers algorithm: 1 ms
    • Send target positions via Ethernet: 0.3 ms
  • Controller side (Real-time OS in ARM)
    • Response to new position targets: < 1 microseconds
    • Motion Algorithm for a smooth motion: Average: 25 ms, Range: 0 to 50 ms
    • Send motion data to 1st micro-controller at 1000 Hz: 1 ms
  • Controller side (2 low-latency micro-controllers)
    • Send motion data from 1st micro-controller to 2nd: 0.1 ms
    • Digital pulse generation: 0.002 ms
  • Electrical connection from 2nd micro-controller to ClearPath motor
    • 3V to 5V conversion: 2 ms
  • ClearPath servo motor
    • Digital pulse signal to actual motion: 1 ms

Technical Specs:

  • ClearPath Integrated Servo Motor CPM-SDSK-2331S-RLN
    • Rated (RMS) Torque = 124 oz-in (0.9 N-m)
    • Peak Torque = 620 oz-in (4.4 N-m)
    • Max Speed = 2,520 rpm
    • Max Weight Capacity = 220 lbs. (100 kg) per actuator
    • Recommend Total Chassis Weight not exceed 500 lbs. (for best performance)
    • Optically isolated, current-based I/O system (EMI free)
  • In-house manufactured actuators
    • 2” (50mm) actuator travel
    • speeds of 8.4″/s @ 2520 rpm
    • 5/8” diameter, USA ball screw, and nut
    • 2” (50mm) diameter piston
    • Mono-block machined billet aluminum body
    • All American made components
  • Motion Controller
    • ClearPath IPC-5 Intelligent Power Supply (input voltage 95-125/190-250 VAC; 50-60Hz) (NO INVERTERS REQUIRED!)
    • Real-time and remote motion control via default browser or phone/tablet
    • Signal processor with an amplifier
    • Embedded microcontrollers
    • Shielded Molex connectors
    • 15″ wide, 9.25″ deep, and 3″ tall
  • VelocityTrap
    • Supports Assetto Corsa and iRacing
    • Ultra-responsive, precise motion control
    • 10 layers of motion integration
    • Real-time remote control
    • Self-balancing (cross balance)
  • Mounting hardware
    • Machined billet mounting bracket
    • T-slot aluminum extrusion (80/20) friendly
    • Machined billet floating feet with mounting capability


  • Assetto Corsa
  • iRacing* More coming soon. Our unique algorithm approach requires accurate tuning to ensure optimal and accurate motion response to signals generated by the software. All motion layers happen in real-time within health and safety limitations. *

Shipping Dimensions:

  • 62 lbs or 28 kg
  • 22″ long x 18″ wide and 12″ tall (56cm x 46 cm x 31 cm)
  • Heavy duty cardboard box with foam inserts