6 dof design thoughts

while looking on youtube for platform design ideas i can across one by motion4sim using cranked tubes and swivels. has anyone else built one to that design. it looks compact and a clever design. what are the swivel connectors called.? i am sure i did know but its gone completely. ! thanks.

If you want DIY 6DOF Stewart, here is a much easier way for making linear actuators, with parts and free plans.

https://departedreality.com/

thanks will have a look at that. what lenght would you recommend for flight sim.? i have 4 wheelchair motors already but still early enough in the design to change to actuators which i agree are better all round and would be my first choice if my budget will allow. most of the other stuff like psu arduinos and motor controllers should work with both i think.

hi, if you have decided on a rotary 6dof you can ask me for help. there are several plans that i make freely available on discord and i'm happy to answer your questions. both design principles have advantages and disadvantages. the advantages of rotating actors are: large actor lengths with minimal space requirements, they are also very quiet. however, only a few parts have to be milled for production. my main dimensions are
1 m x 1 m x 0,6 m with 180mm in heave,sway and surge and 27 degree in all rot. axis a linear setup cant reach this compact format. rotating actors are also faster than leadscrew actors depending on servo motor speed and used gearboxes
this is the most important advantage of rotating actuators. we want to be fast.

I can only report on rotating actuators, maybe someone will write about the advantages of linear actuators here, with practical experience.

Difference between rotary and linear actuaters
first rotary actuators. there are different gearboxes to make a rotary actuator
wormgearbox is a sliding one got a different efficienty every ratio and backlash is not given because they arent made for precice motion, and can make little jumps becauce they are sliding.
Spurgearbox is a rolling one, no jumps and no backlash given becauce not made for precice motion
and different efficienty every stage not ratio.
a PLanetary gearbox is a rolling one different efficienty every stage and give there backlash becauce they are made for precice and dynamic motion, best gearbox for simulators. onlly down site they have torsion inside the gearbox and this absorbes fine motion.

Linear actuators works with screws sliding and rolling ones
sliding ones amce screw leadscrew torquespline have a different efficienty by every different pitch
Mostly no given precicion and must overcome friction first this give loss of fine motion
Rolling screws ballscrew and rolllerscrew have no friction only a little resistance and all have the same efficienty. the avantage of a screw is they are direct ,no stages, no torsion, and ball and rollerscrews got precicion classes you will feel everything with a ballscrew
sorry for the bad english regards ad