High Performance Stewart Platforms

DSM is capable of designing and building superior quality and high performance parallel kinematic actuators, also known as Gough/Stewart Platforms. These parallel manipulators feature 6DOF motion with repeatable precision possible down to a micron level.

Some example specifications that would typically be specified in a custom request:

  • Range of motion (linear and angular)
  • Precision
  • Load capacity
  • Stiffness
  • Size

DSM would be happy to discuss with you if our engineering and production teams can meet your needs. 

development@dynamic-structures.com


OEM Stewart Platform

DSM developed a conventional Stewart platform design for a large OEM in the precision positioning industry.  This project was a commercialization of previous work for US Army TATRC.  The mechanism uses extensible struts, with the option for high resolution encoder feedback on both the motors and the strut outputs.  Ball joints were used rather than flexures, allowing for comparatively large range of motion, approximately 50 x 50 x 15 mm translation in X, Y, and Z, and angular rotations of about ±4 degrees.  Overall size was 24 cm high with 23 cm base diameter.  Details of the commercialization are restricted by a confidentiality agreement between DSM and the OEM.  A rendering of the design concept is shown beside the final prototype, illustrating DSM’s ability to accurately project the design outcome and carry the project through to completion.

Stewart platform rendering and final product side by side

Hexapod Stage - Medical Application

DSM developed a parallel kinematic hexapod, similar to a Stewart platform, for compliance-based medical imaging and surgical interventions, funded by The Office of the Secretary of Defense (OSD).   The design featured a six degree-of-freedom parallel end-effector mechanism that could be mounted on the end of a medium-sized robot manipulator.  

From the SBIR Project Summary:  Ultrasound represents one of the most promising new technologies for use both on and off the battlefield.  During ultrasound procedures, it is typically required that a specified level of force be applied on the patient, which is made particularly difficult because of the compliance of soft skin tissue and involuntary movements due to respiration. It is extremely difficult for a serial-link manipulator to respond quickly enough to accommodate this motion due to high inertia and inaccuracies caused by low stiffness at the tool point.