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.

  • 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




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

 - PCB Layout & Schematic capture

 - Human Machine Interface Development &

 - 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



 - 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


 - Monitor and communicate with suppliers

 - Assemble prototype units in-house

 - Boards assembled outside (bread boards in-


 - Conduct performance testing

 - Design, build and assemble test stands

 - Torque & load sensors, oscilloscope, power

   supplies, wave fuction generators, wire

   harnesses and LabVIEW for data acquisition

 - Update/correlate analysis with test results

 - Update fabrication drawings

 - Electronically send 3D models and drawings to



Tools We Use:




 - Unigraphics

 - OrCAD ®

 - MathWorks-Simulink

 - Flux 2D

 - Cadkey ™




Hydro-mechanical / Turbomachinery  

 - Structural & Fatigue Analysis

 - Designed, developed and tested an electronically

   controlled gearbox the transformed the engine

   driven F135 Lubrication/Scavenge pump into a flow

   on demand pump 

 - Designed and developed a motor driven 20 GPM

   fuel pump – aerospace application

 - Designed and developed a motor driven 5 GPM

   cooling pump – aerospace application

 - Designed and developed (patented) a motor driven

   micro fuel/lubrication pumps for various


 - Designed and developed a multi-stage fuel pump -

   aerospace application

 - Investigate and tested various floating labyrinth seal

   materials that could withstand a touch down during

   a fuel starvation event – aerospace application 

 - Designed and developed motor driven low flow, high

   pressure oil pump – automotive application 

 - Designed a water cooling pump for a marine


 - Designed and tested a water cooling pump for a

   commercial application 

 - Design a cooling pump for a nuclear power plant


 - Designed and developed a motor driven high flow

   rotary compressor - automotive application

 - Designed and developed a motor driven rotary

   compressor - medical application




 - Designed and developed (patented) an

   electronically controlled continuous variable

   transmission – aerospace, power generation,

   automotive/heavy truck application 

 - Design and developed a high speed/power gearbox

   – UAV application 

 - Designed lubrication system for internal combustion


 - Designed and developed a sensor positioning

   gearbox –

   high volume commercial application 

 - Design and developed a sensor positioning plastic

   gearbox – high volume commercial application 


Hydraulic/ Pneumatic


 - Designed high temperature engine air bleed valves

   – aerospace application 

 - Designed pneumatic butterfly and gate valves –

   aerospace & commercial applications 

 - Designed several pressure regulating, metering and

   relief valves – aerospace application 

 - Designed and developed two engine hydraulic

   actuators - aerospace application

 - Designed fuel filtration system  - automotive



Electro-mechanical / magnetic

 - Designed high temperature electric actuator –

   aerospace application 

 - Designed several electric actuators for the F-35, E-

   10A, Honda Jet, Cirrus Jet, Diamond D-Jet and

   Eclipse programs - aerospace applications 

 - Designed several A/C and D/C motors - aerospace


 - Designed and developed high temperature switch

   reluctance motor - aerospace applications


Machine Design /  Test Stands

 - Designed and developed pick and place/work

   transfer machines that contain turntables,

   conveyors, pneumatic hold downs with sensors–

   commercial applications  

 - Designed and developed a gearbox load tester/life

   test stand - commercial application

 - Designed and developed ball screw efficiency

   testers – automotive and aerospace applications 

 - Designed and developed electric actuator machines

   to performance check actuators prior to shipping – 

   aerospace application 

 - Designed and developed hydraulic test stands to 

   performance check pumps prior to shipping –

   aerospace, automotive and commercial


 - Designed and developed a grinding machine and

   annealing station - consumer industry