Lauching finally a 3DOF (seat mover) instead 6DOF low cost dynamic simulator

Hi guys,

sorry I will finally simplify my project (6dof) to a simple seat mover (3dof), because the room where I can place the simulator is finally much smaller than the room I had initially reserved for that...

So do not consider all the following discussion...

I will finish this seat mover (I think I am very closed to), but I have a dream: build
a compact 6dof (stewart platform) + partial home made G-Seat + VR and with degrees of freedom around +/-30° for pitch/roll/yaw and around +/-20cm for surge/sway/heave... I do not know if it is realistic
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Initial project (6dof):

...
after several months of reflection, having changed several times the concept, I launch now my project...
As a good video is better than a long discourse, I let you see my short movie and I look forward to have your opinions, questions, advises. Thank you in advance

Very unusual build, I cant wait to see it progress.

Hello noorbeast,

thank you for you relevant comments. I tried effectively to reduce the number of arduino, but unfortunately, with the architecture I would like to implement, too much pins are needed (for example juste for analog input: feedback, current, tachymeter, an 3 adjustable resistor to read for Proportional, Integrale, Derivative value, that will not be adjusted by soft). I am currently writing the header of the software, where you will find much more detailled explanations. In anycase arduino boards are not very expensive so I do not try to optimize the number of boards.

Concerning the required power for the rig movement, I am not sure effectively I will have enough power with enough fast movements. I hope thatwill enough enough for flight simulation, and I will use in this case only the seat moving for car races... In fact I do not know what will be the performance, taking into account that:
The rig weight will be around 150kg (including the pilote), and it will be almost balanced (using the center of gravity + a garage door spring) but not totally (because cable drive can work only in one direction…), with the aim of reducing the required power. It is easy to find used washing-machine universal motors for about some hundreds Watts to 1 kiloWatts. With this kind of motor, and without limitation, the spin speed increases very rapidly to 10 000 and more rpm (it is the reason I have to measure the current and thespin speed thanks to the tachymeter present in these motors). The gear ratio in insure by classical steel endless screw + barrel nut (diam 10 or 12 mm ?), surrounded by a PVC conduit (to prevent grease projection) with a slot all along for the mechanical crank link (ball bearing slide). Sure I will have a lot of adjustement and clarification to make when I begin to test my simulator...

Me too Fluke I would like to finish rapidely. I think severals months will be required. I have begin to weld the cockpit, I will send photos in a future post.

Hi, I had a look on SMC3 arduino code, that seems interrested. PerhapsI can divide by 2 the number of arduinos.

are you running the motors AC ? how do you swap direction

i suggest you get an arduino and program it and get a motor running to get familiar with the smc program

have you decided on the ballscrew and threads ?

I will use washing-machine universal motor, so in 220v ac, but normaly this kind of motor accepts also dc. To swap the direction, you have to swap the 2 terminal connections of the stator, or the 2 terminal connectors of the rotor (the rotor and the stator are connected in serie).
I have also began to write the arduino code, but from scratch

interesting the motor will accept DC - does it use brushes ?
how many volts DC will the motor need ?

@Gadget999
By separately powering the stator and armature windings he is turning an AC universal motor in to a DC sepex motor.
A sepex motor is basically a DC brushed motor but uses a coils (electromagnet) instead of permanent magnets on it's stator.
Yes, an universal motor has brushes and commutator on it's rotor.

I think you have answered to you own questions...,
concerning the voltage in dc, I suppose it is the same than in ac (so 220v in my case). I will use a diode bridge to transform 220ac in 220dc, and not added high capacitor because that would increase this voltage about to 320v with risk of damage (motor overvoltage). Then I will use a full bridge (mos or igbt) for a PWM power control

For your information I have created a specific post in the good place (actuators and drivers) so I will not continue to describe this part of my project in this current post, but in the new one:
https://www.xsimulator.net/community/threads/powerful-and-low-cost-220v-motor-driver.11627/

From drawing to reality: I had some availability this week-end, so here after a first component (base of the cockpit)...

Hello all,
I am available this afternoon, so I will make the seat pivot, which is a part of the seat mechanism, then I will send you photos by this evening...

Hi, I have well progressed on the seat pivot, but no finished...

Hello all,
some news, the design is changing (version 2 ). Mainly the base (to provide large movements pitch, roll, yaw-traction loss) is rethinking : use of 220v monophasis hoist (my concern is how to control the speed of asynchronus motors). I have also decided to implement a triple head. The first test with a gt1060 6g overclocked and rfactor are very good (I paid the 2 19'' 4/3 screens 25 euros each one...),
see you...

Hello DYI men/women,

little by little my Xdof dynamic simulator takes shape, here after the last photos ...

see you