1. Do not share user accounts! Any account that is shared by another person will be blocked and closed. This means: we will close not only the account that is shared, but also the main account of the user who uses another person's account. We have the ability to detect account sharing, so please do not try to cheat the system. This action will take place on 04/18/2023. Read all forum rules.
    Dismiss Notice
  2. 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 Now a Download Plan!
  3. 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
  4. 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. Do not follow these rules can lead to permanent exclusion from this website: Read the forum rules.
    Are you a company? Read our company rules

ChrisOmaha 2DOF Build Thread

Discussion in 'DIY Motion Simulator Projects' started by ChrisOmaha, Mar 28, 2022.

  1. ChrisOmaha

    ChrisOmaha New Member Gold Contributor

    Joined:
    Feb 23, 2022
    Messages:
    5
    Balance:
    - 76Coins
    Ratings:
    +6 / 0 / -0
    My Motion Simulator:
    2DOF
    Building a 2DOF sim with my sons. Specs so far are ibt2 controllers and jazzy wheelchair motors. Frame is built from 1 inch square tube and a steering u joint. The seat is from Summit Racing. I purchased a 24v LED power supply but smoked both IBT2s, working better with a 12v battery for now but still have not settled on a power supply or possibly different controllers.

    Just got to the point where everything is tack welded together enough to test motion and geometry. It will get a little more bracing but everything seems to work well already.





    PXL_20220305_201351643.MP.jpg PXL_20220306_194028232.jpg PXL_20220309_033102879.MP.jpg PXL_20220319_190335557.MP.jpg PXL_20220319_190340360.jpg PXL_20220319_192700861.jpg PXL_20220327_230232602.jpg
    • Like Like x 3
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    20,437
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    144,452Coins
    Ratings:
    +10,730 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Great to see your rig in action :thumbs

    You may need to re-balance your rig once all peripherals are added, particularly with a compact design, which has limited inherent design leverage.

    What are you using as a uni-joint?
  3. ChrisOmaha

    ChrisOmaha New Member Gold Contributor

    Joined:
    Feb 23, 2022
    Messages:
    5
    Balance:
    - 76Coins
    Ratings:
    +6 / 0 / -0
    My Motion Simulator:
    2DOF
    The U joint is a steering linkage off some car at the junkyard. Didnt actually even see what the car was, just saw one what was in very good condition and was a little bigger then some others and easily accessible. I cut the bottom off of its shaft to weld onto the seat side, then use the pinch bolt to attach it to the seat frame while still being easily detachable. So far so good, no play in it at all.

    This last week my eldest son completed all of the bracing and welding. Then my younger sons helped me paint and mount the pedals.

    I wired up some HP DPS-600pb power supplies to replace the car battery from the last test.

    Now it just needs more testing and tuning. May shorten the CTC arm a little more as the axis is currently limited by the nose hitting the ground so we could probably decrease backlash and increase resolution with a shorter arm. Otherwise its near ready to go.

    PXL_20220409_020153327.jpg
    PXL_20220410_233122519.jpg PXL_20220411_130541749 (1).jpg PXL_20220410_202120986.jpg

    PXL_20220410_182539286.MP.jpg PXL_20220410_174458265.MP.jpg PXL_20220412_004400297.jpg PXL_20220412_010547578.jpg PXL_20220412_010948431.jpg PXL_20220412_030219583.jpg
    • Like Like x 1
  4. ChrisOmaha

    ChrisOmaha New Member Gold Contributor

    Joined:
    Feb 23, 2022
    Messages:
    5
    Balance:
    - 76Coins
    Ratings:
    +6 / 0 / -0
    My Motion Simulator:
    2DOF
    Made a little more progress this weekend. The IBT2 controllers were regularly cutting out under aggressive loads such as crashes so I upgraded to two Cytron MD20A motor drivers which offer 20 amp continuous and 60 amp peak. So far these have been a great upgrade for the price. We put them through repeated violent crashes for a few hours and could not get them to trigger over current or raise their temp much above room temperature, even without heatsinks.

    I did manage to trip the HP power supplies a couple times but only with a smaller child and once when the chair was actually unloaded. I guessing its not actually load related but may be a regenerative spike during fast reversals that may be making them upset. I may try adding some large capacitors although it has not been a regular issue.

    I also played with monitor combinations. The quest headset makes me motion sick and limits games. I acquired a cheap 27" monitor and experimented with mounting to the frame but I feel like I may actually prefer the monitor not moving and actually liked it better on the desk. I may build a static stand that holds it just over the sim.

    PXL_20220430_175331790.jpg
    PXL_20220430_185341578.jpg


    Attached Files:

    • Like Like x 1
  5. Takumivs

    Takumivs Project CPT

    Joined:
    Nov 6, 2018
    Messages:
    80
    Occupation:
    Mechatronics / Mechano Engineer
    Location:
    South Africa
    Balance:
    48Coins
    Ratings:
    +69 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, AC motor, SCN5, SCN6, Arduino, JRK, Joyrider, SimforceGT, Motion platform, 4DOF, 6DOF
    Howsit gent I trust yo are well, I need abit of assistance if possible to help figure out on SMC3. when put the pots green line onto the blue line turning power on the motor jump aware from the lines, the more i try to adjust the pot to the blue line the motor goes one direction away from the line. using mode1 on the SMC3 settings...thank you kindly my gent. I take you using SMC3 firmware with mode1
  6. ChrisOmaha

    ChrisOmaha New Member Gold Contributor

    Joined:
    Feb 23, 2022
    Messages:
    5
    Balance:
    - 76Coins
    Ratings:
    +6 / 0 / -0
    My Motion Simulator:
    2DOF
    Yes, I used mode 1 with the Cytron controller.

    I only used the pins below on the Arduino.
    9 Motor 1 PWM (PWM)
    2 ENA Motor 1 (Direction)

    10 Motor 2 PWM(PWM)
    4 ENA Motor 2 (Direction)​

    If its going away from the line you can reverse the motor + and - at the controller to reverse the motor direction. Or I believe you can also use ENB which is inverted in Mode 1.
    • Winner Winner x 1
  7. ChrisOmaha

    ChrisOmaha New Member Gold Contributor

    Joined:
    Feb 23, 2022
    Messages:
    5
    Balance:
    - 76Coins
    Ratings:
    +6 / 0 / -0
    My Motion Simulator:
    2DOF
    To solve the power supplies randomly tripping I added Pololu shunt regulators, specifically the 13.2V 15W.

    The shunt regulators with the Cytron/HP power supplies seems to be a reliable combination so far. I probably have a few dozens hours of use with no hiccups since adding them.
  8. Takumivs

    Takumivs Project CPT

    Joined:
    Nov 6, 2018
    Messages:
    80
    Occupation:
    Mechatronics / Mechano Engineer
    Location:
    South Africa
    Balance:
    48Coins
    Ratings:
    +69 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, AC motor, SCN5, SCN6, Arduino, JRK, Joyrider, SimforceGT, Motion platform, 4DOF, 6DOF
    Yah thanks my gent, im currently using pin 3 an pin 5 which i tried pin 2 and 4 but wasnt doing anything. will give that a shot and see if it was a wiring issue. thanks a million gents
  9. Takumivs

    Takumivs Project CPT

    Joined:
    Nov 6, 2018
    Messages:
    80
    Occupation:
    Mechatronics / Mechano Engineer
    Location:
    South Africa
    Balance:
    48Coins
    Ratings:
    +69 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, AC motor, SCN5, SCN6, Arduino, JRK, Joyrider, SimforceGT, Motion platform, 4DOF, 6DOF
  10. Takumivs

    Takumivs Project CPT

    Joined:
    Nov 6, 2018
    Messages:
    80
    Occupation:
    Mechatronics / Mechano Engineer
    Location:
    South Africa
    Balance:
    48Coins
    Ratings:
    +69 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, AC motor, SCN5, SCN6, Arduino, JRK, Joyrider, SimforceGT, Motion platform, 4DOF, 6DOF

    Im using 2 x 24v 15A psu, the fans in them determine load by how loud they get and so far its been super quiet when i had them running with IBT's but pop two that i upgraded to cytron MD20A which worked off the bat but for some reason the one motor kept going out of range when i was braking for corners on ac. and that where discovered that i cant get the pot line to much the blue line on SMC3 which open a whole bag of worms.lol.
  11. Takumivs

    Takumivs Project CPT

    Joined:
    Nov 6, 2018
    Messages:
    80
    Occupation:
    Mechatronics / Mechano Engineer
    Location:
    South Africa
    Balance:
    48Coins
    Ratings:
    +69 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor, AC motor, SCN5, SCN6, Arduino, JRK, Joyrider, SimforceGT, Motion platform, 4DOF, 6DOF
    Found the issue, the expansion board i was using became faulty, i wired a pot to see what it was doing and saw the board would short out when fully maxed the pots. now its work again without the expansion board.
    • Like Like x 1