1. For downloading SimTools plugins you need a Download Package. Get it with virtual coins that you receive for forum activity or Buy Download Package - We have a zero Spam tolerance so read our forum rules first.

    Buy Download Package Now!
  2. Do not try to cheat our system and do not post an unnecessary amount of useless posts only to earn credits here. We have a zero spam tolerance policy and this will cause a ban of your user account. Otherwise we wish you a pleasant stay here! Read the forum rules
  3. We have a few rules which you need to read and accept before posting anything here! Following these rules will keep the forum clean and your stay pleasant here. Do not following these rules will lead to permanent exclusion from this website: Read the forum rules.

DIY 2DOF home build

Discussion in 'DIY Motion Simulator Projects' started by Alexey, Sep 26, 2014.

  1. Alexey

    Alexey Well-Known Member

    Joined:
    Sep 23, 2014
    Messages:
    433
    Occupation:
    Electronics Technician
    Location:
    Adelaide, Australia
    Balance:
    7,553Coins
    Ratings:
    +582 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, Arduino
    Hi Guys,

    I would like to share with you my attempt at a 2dof home build.
    The design will be the usual shoulder mount using wiper motors at first and then
    moving on to something a bit more industrial depending on how things go.
    Control circuit will be handled by the trusty arduino mega.

    Since programing is the bane of my existence I built a test rig first to see if I could get the
    thing to talk with the computer and then use it in a simulator. The rig took me about 30 mins
    to put together as I already had all the parts lying around.
    [​IMG]
    [​IMG]
    After a bit of fuffing about, success!


    Still needs much tweaking and a re alignment of the pushrods as rolling left is not as defined as rolling right, the video makes it look worse than it is as you can't see the track properly. There are points that look like it should roll left but doesn't because the track itself is on a lean in the first place, thus reducing roll.

    Thank you xsim! All the resources needed have been extremely easy to find and well put together.
    Cheers! Alexey.
    • Like Like x 8
  2. tadythefish

    tadythefish Active Member

    Joined:
    Jul 8, 2009
    Messages:
    146
    Occupation:
    Process automation engineer
    Location:
    Slovenia
    Balance:
    377Coins
    Ratings:
    +92 / 1 / -0
    My Motion Simulator:
    3DOF, DC motor, Arduino
    NICE RIG :) are thos servos modified or are you running the rc servo sketch on the arduino
  3. Alexey

    Alexey Well-Known Member

    Joined:
    Sep 23, 2014
    Messages:
    433
    Occupation:
    Electronics Technician
    Location:
    Adelaide, Australia
    Balance:
    7,553Coins
    Ratings:
    +582 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, Arduino
    Hi Tady, the only unfortunate part of the rig is that it can't handle my weight !
    No the servos are not modified and yes I am using the rc servo sketch.

    More updates to come shortly!
    • Funny Funny x 2
  4. Alexey

    Alexey Well-Known Member

    Joined:
    Sep 23, 2014
    Messages:
    433
    Occupation:
    Electronics Technician
    Location:
    Adelaide, Australia
    Balance:
    7,553Coins
    Ratings:
    +582 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, Arduino
    Not as large of an update as I would have liked but its some progress anyway. I was hoping to get some of the frame done over the long weekend but i didn't end up having enough free time :( . I did hover make a little progress on the electronics side and put together my own H bridge.

    I call it the Frankenbridge!
    [​IMG]

    It is an amalgamation of two servo controllers mated to a H-bridge for more power handling. I have basically taken the outputs of the controller that would normally attach to the small motor and use them as inputs to a simple H-bridge. This thing should be good for 18 Amps once I have put some heat sinks on. The mosfets are IRF7842PBF link: http://www.irf.com/product-info/datasheets/data/irf7842pbf.pdf .
    [​IMG]

    It's not quite the final design as I've still got much testing to do.

    Also made a coupler for the pots and the motor shaft. The pots will be replaced with some good ones as these are still the original servo ones.
    [​IMG]

    The design has worked with transistors so I'm pretty sure this should work a treat too.

    Cost total = $18 ($5 per servo and $1 per mosfet)
    I already had the servos so that was even better.

    Cheers!
    • Like Like x 3
  5. Alexey

    Alexey Well-Known Member

    Joined:
    Sep 23, 2014
    Messages:
    433
    Occupation:
    Electronics Technician
    Location:
    Adelaide, Australia
    Balance:
    7,553Coins
    Ratings:
    +582 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, Arduino
    Hi guys, things have moved along! I ended up with a bit of an issue with the H-bridges when the motor is still, the H-Bridge gets full supply dumped through them as the motor itself acts as a short circuit. The fets are able to conduct because they are directly attached to supply, meaning they are susceptible to avalanche breakdown (voltage is high enough to to start conducting across source and drain without any base voltage). My supply is capable of delivering 40 amps all day which means that the 18 amp mosfets were getting over double the rated current. Being impatient and not wanting to go and buy 40 amp mosfets that would handle the abuse or re design the circuit to stop avalanche breakdown from occuring, I discovered some arduino stepper motor drivers:
    http://www.ebay.com.au/itm/400749238150?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 .
    And I'm looking to pair with these motors:
    http://www.ebay.co.uk/itm/12V-DC-Geared-Motor-Motor-with-60-1-ratio-Gearbox-Left-Hand-/111415229286?ru=http://search.stores.ebay.co.uk:80/search/search.dll?st=1&srchdesc=n&fp=0&sid=266253021&store=Motion-Control-Pro

    I was originally going to use wiper motors but have decided that I want more from the sim (mount monitor to rig, custom pedals, quicker motion action). This has all been fueled by playing Assetto corsa for hours on end. The only sim that I played before was Gran Turismo 2&3 many moons ago and since then I have only dabbled in arcade racers like Grid 2 etc. After playing a couple of hours on practice mode I thought I'd break into multiplayer thinking that my time of 1:52 on Imola in the Z4 GT3 was something special. I was pummeled into the ground by most players. So I hit the books and videos and managed to get that down to a respectable 1:45 using the P4/5. To get any quicker I need to get better at trail braking which requires better pedal feel as it's hard to judge brake pressure with the DFGT pedals. Custom pedals it is then!

    In other news I have made the cockpit section of the rig!

    The workshop:
    [​IMG]

    Early Access pre-alpha rig:
    [​IMG]

    Update 0.1
    [​IMG]

    Addiction:
    [​IMG]

    I'm having panic attacks knowing that I have to move the rig out to modify it.

    Work to be done:

    Convince myself to move rig
    Wash seat (a free seat is a free seat)
    Battle spider horde underneath recliner handle
    Shorten cockpit
    Raise wheel mount
    Make shoulder frame
    Make pivot
    Make new pedals
    Make base for rig
    Hack flight stick into H shifter, sequential shifter and clutch addon
    Electronics wizardry
    .......
    Profit?

    I've probably forgotten to add something like "get a life".

    Cheers!
    • Like Like x 3
    • Funny Funny x 1
    Last edited: Oct 16, 2014
  6. Alexey

    Alexey Well-Known Member

    Joined:
    Sep 23, 2014
    Messages:
    433
    Occupation:
    Electronics Technician
    Location:
    Adelaide, Australia
    Balance:
    7,553Coins
    Ratings:
    +582 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, Arduino
    Decided that I should try to do more at home rather than relying on my lunchtime at work to get things done, so I've decided to finally get my ancient drill press restored. It's a bit of a drawn out process but it's getting there and in the end I'll be able to get more done at home with other projects and the like. It's mainly just surface rust but it's still takes a bit of time to get it all off.
    I've pulled off a motor from a treadmill and it's speed controller so no need to change belts!

    [​IMG]
    [​IMG]

    Also my 200W motors arrived from motion dynamics. Awesome turnover time! I ordered my motor controllers two weeks ago and they still haven't arrived.
    [​IMG]
  7. bsft

    bsft

    Balance:
    Coins
    Ratings:
    +0 / 0 / -0
    Good stuff man
  8. Nick Moxley

    Nick Moxley Well-Known Member

    Joined:
    Dec 13, 2013
    Messages:
    2,753
    Occupation:
    Owner/Operator- Moxleys Rantals
    Location:
    Winnipeg Manitoba Canada
    Balance:
    19,411Coins
    Ratings:
    +2,459 / 29 / -2
    My Motion Simulator:
    2DOF, 3DOF, DC motor, JRK
    Darn are those motor's shiny when new.....lol
  9. Alexey

    Alexey Well-Known Member

    Joined:
    Sep 23, 2014
    Messages:
    433
    Occupation:
    Electronics Technician
    Location:
    Adelaide, Australia
    Balance:
    7,553Coins
    Ratings:
    +582 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, Arduino
    Well I have been a little bit busy of late but I can now post up a progress report. I have made up a custom pedal set and 2 gear shifters (5 speed H pattern and sequential). They are still a bit rough around the edges but if time permits I'll neaten them up.

    Clutch, Brake, Accelerator. Yes the pedals are upside down, whats done is done and I'm too lazy to rectify it. The brake and accelerator will run from the DFGT pedal port and clutch will be handled by a logitech joystick axis.
    [​IMG]

    I decided to use a slide potentiometer as it gives uniform movement and full voltage swing. Probably wont last as long but they are cheap to replace.
    [​IMG]
    [​IMG]

    Double spring brake
    [​IMG]

    Using two 12mm threaded rods, I can change the pedal separation (no bolts shown yet, just mock up). Also making a clamp system allows for changing pedal distance by sliding up and down frame rails.
    [​IMG]
    [​IMG]

    Mock mount
    [​IMG]
    • Like Like x 4
    • Winner Winner x 2
  10. Alexey

    Alexey Well-Known Member

    Joined:
    Sep 23, 2014
    Messages:
    433
    Occupation:
    Electronics Technician
    Location:
    Adelaide, Australia
    Balance:
    7,553Coins
    Ratings:
    +582 / 2 / -0
    My Motion Simulator:
    3DOF, DC motor, Arduino
    Sequential shifter, at the end of the springs is a tab which activates a micro switch either side of it.
    [​IMG]
    [​IMG]

    H pattern shifter, I liked this build as opposed to a clipped gate with a single spring attached to the leaver. This build allows for a realistic feel to shifting gears.
    [​IMG]
    [​IMG]

    The gate looks like a dogs breakfast but the shifts are smooth and catch properly. I still need to bolt the micro switches in and wire it all up.
    [​IMG]

    If anyone would like more info or more detailed pictures and a write-up of each pedal/shifter I can start a new thread if requested.

    Slowly getting there.

    Cheers.
    • Like Like x 6
    • Winner Winner x 6
  11. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

    Joined:
    Jul 13, 2014
    Messages:
    12,613
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    96,480Coins
    Ratings:
    +8,106 / 40 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Really nice craftsmanship on the pedals and shifters @Alexey :thumbs

    I am looking forward to seeing them in action when you get around to shooting a video.
    • Agree Agree x 1
    Last edited: Feb 24, 2015
  12. bsft

    bsft

    Balance:
    Coins
    Ratings:
    +0 / 0 / -0
    great work there, looks real neat
  13. GIB SimRacing

    GIB SimRacing Active Member

    Joined:
    Feb 19, 2015
    Messages:
    238
    Location:
    Adelaide, SA
    Balance:
    1,446Coins
    Ratings:
    +245 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, JRK
    @Alexey Those pedals are awesome! That is seriously impressive.
    It also gives me ideas............dammit:D
    • Agree Agree x 1
    • Funny Funny x 1
  14. prodigy

    prodigy Burning revs

    Joined:
    Oct 27, 2013
    Messages:
    429
    Location:
    Croatia
    Balance:
    6,346Coins
    Ratings:
    +372 / 3 / -0
    My Motion Simulator:
    2DOF, SCN5
    • Informative Informative x 3
    • Like Like x 1
  15. Pit

    Pit - - - - - - - - - - - - - - - - Staff Member Moderator Gold Contributor

    Joined:
    Oct 2, 2013
    Messages:
    2,985
    Location:
    Switzerland
    Balance:
    29,048Coins
    Ratings:
    +2,975 / 29 / -0
    My Motion Simulator:
    DC motor, Arduino, 6DOF
    really great work! Pretty cool idea the h-shifter, this design I have never seen before.
    • Agree Agree x 1
  16. value1

    value1 Nerd Staff Member Moderator SimAxe Beta Tester SimTools Developer Gold Contributor

    Joined:
    Jan 9, 2011
    Messages:
    2,093
    Location:
    Zug, Switzerland
    Balance:
    5,985Coins
    Ratings:
    +3,005 / 11 / -1
    My Motion Simulator:
    2DOF, DC motor, JRK, Joyrider
    Wow! Beautiful! I'm impressed!
  17. Blame73

    Blame73 Yet it moves!

    Joined:
    Nov 6, 2014
    Messages:
    1,137
    Location:
    Italy
    Balance:
    8,055Coins
    Ratings:
    +993 / 2 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform
  18. ferslash

    ferslash Active Member

    Joined:
    Feb 8, 2011
    Messages:
    475
    Balance:
    4,601Coins
    Ratings:
    +171 / 2 / -0
    nice work man, what tools did you used? a full metal workshop or just a few cleaver tools?
    fer
  19. ferslash

    ferslash Active Member

    Joined:
    Feb 8, 2011
    Messages:
    475
    Balance:
    4,601Coins
    Ratings:
    +171 / 2 / -0
    nice work man, what tools did you used? a full metal workshop or just a few cleaver tools?
    fer
  20. Nick Moxley

    Nick Moxley Well-Known Member

    Joined:
    Dec 13, 2013
    Messages:
    2,753
    Occupation:
    Owner/Operator- Moxleys Rantals
    Location:
    Winnipeg Manitoba Canada
    Balance:
    19,411Coins
    Ratings:
    +2,459 / 29 / -2
    My Motion Simulator:
    2DOF, 3DOF, DC motor, JRK

    with the precision of most of those cuts on the pedals/shifter, i would say he some Fancy tools to play with, Or access to some.



    Nice setup Alexey, look forward to your next project.