Even if I find the 180° foldback design ugly and more complicated, I’ll stick with it to save 25cm of actuator height.

  • ++ : more compact, less total height, more platform movement for a given actuator stroke
  • ++ : you can dismantle the motor in case of problem without dismantling the actuator
  • — ++ : more complex, more parts
  • – : ugly (it’s subjective but I prefer linear)
  • – : a little more noise because of the belt

As usual, it’s a compromise 🙂 We have to make the good choices regarding the needs we have : size, noise, stroke, power …

Rendering showing a side view of the linear actuator
Linear actuator stroke 620mm
Rendering showing a side view of the linear actuator
Linear actuator stroke 620mm (section view)
Rendering showing a view of the moving and fixed parts of the cylinder
Internal parts of linear actuator

The design changes quite a bit from the V1 as you can see: basically going from one big central piston to 4 small outer pistons, inspired by what other enthusiasts have done. On the first picture the tube is transparent, it will not be the case in real life, it will be in matt black aluminium.

The main advantages/disadvantages of this design are :

  • ++ : no more big chrome rod and bearing, expensive and hard to find
  • ++ : easier link between the ball screw nut and the axles
  • ++ : possibility to put a real bearing at the end of the ballscrew, much more robust
  • – ++ : more parts for the assembly
  • – ++ : we’ll see with the assembly and the use !

This design is inspired by what you can find on various forums of simulator enthusiasts. I can’t wait to test it with the machined parts to see what it looks like in real life.

It also has the advantage of being modular: I can easily change the cylinder stroke by changing the dimensions of the screw, the tube and the guide rails. I can also, with some adaptations, put a motor in line and not in “foldback”.

See you soon for new adventures!