Turnkey Design Services has been providing expert, custom engineering services for over 15 years. Our experienced team specializes in machine design, electro-mechanical, electro-hydraulic, electro-pneumatic and turbomachinery components and systems. Our facility in Spartanburg, South Carolina contains not only our offices, but includes an engineering lab, test/assembly room and a machine shop.


We specialize in:
  • Machine Design & Development

  • Motor Driven Actuation Systems

  • Gearboxes

  • Motor and Gearbox Driven Pumps

  • Hydraulic and Pneumatic Actuation Systems

  • Test Stand Design and Fabrication

  • Custom Product Development



As a full service product design firm, we provide our clients with:




 - Gearbox design & analysis 

 - Structural & Fatigue Analysis

 - Ball Screw design & analysis

 - Rolling element & fluid film bearing analysis

 - Fluid Mechanics (dynamic & static) analysis

 - Heat Transfer analysis

 - Drafting per ANSI Y14.5 & Tolerance study analysis




 - PLC & Embedded Microprocessor programming (Allen Bradley, Microchip, Microsemi, Texas)

 - PCB Layout & Schematic capture

 - Human Machine Interface Development & LabVIEW

 - Network Protocol generation

 - Motor Design & Electromagnetic analysis

 - Motor Controller Design

 - AC/DC Motor Design

 - CCA Prototyping

  • Boards built and assembled by specialty houses  

  • Tested at TDS


Design, Fabricate, Assemble, and Test Product to Spec


 - Conduct PDR & CDR reviews
 - Create fabrication details using ANSI and client's standards on client's format.
 - Use local (or client specified) suppliers for prototype fabrication
  • Gear, housing, shafting, ball screw, electronic boards

 - Monitor and communicate with suppliers

 -  Assemble prototype units in-house

  • Boards assembled outside (bread boards in-house)

 - Conduct performance testing

  • Design, build, assemble test stand

  • Torque & load sensors, oscilloscope, power supplies, wave function generator, wire harnesses, LabVIEW for data acquisition.

 - Update/correlate analysis with test results

 - Update fabrication drawings

 - Electronically send 3D models and drawings to client


Tools We Use: 

 - Unigraphics
 - OrCAD ®
 - MathWorks-Simulink
 - Flux 2D
 - Cadkey ™