Reverse Double Four Bar Lift Tips?

  1. 8 months ago

    My team and I are new to Vex Robotics and would like to build a reverse double four bar lift and have been advised by more experienced teammates building other robots to use the gray turntable bearings as opposed to having a large amount of gears. We would like our life to collapse down between the sides of our drive base, leaving room for the claw and cortex as well as stabilizing bars for our drive base. Any tips or tricks we should know or helpful tutorials anyone could point out for us?

  2. hi here is a great tutorial that explains how double reverse 4 bars work and how to build one.

  3. antichamber

    11 Oct 2017 Suspended Denver CO 80111 80110H

    Firstly, don't use the grey turntables. They are far too heavy and have too much friction. Use normal bearings instead. Second, take time to plan the middle section of your lift. The middle section that connects the bottom and top 4bar is very difficult to build well, and it's build quality impacts how stable your lift is more than anything else. Third, don't just build one dr4b. After you finish your first one, examine it closely, find and record all your mistakes, and when you get the time, rebuild the entire lift. Due to the fact that you are a new team, having the experience of building something multiple times so that you understand how to go about building it in the future is crucial. Finally, wherever you can, reduce slop. Slop, or play, adds up quickly and can lead to unstable and unreliable lifts.

  4. Dokkaebi

    11 Oct 2017 Deal with it I like chocolate

    Don't put all the motors on the main beam that is connected to your chassis (unless you are that top 0.1% that somehow has the magic ability to make a good lift with that motor positioning).

  5. 9065_Parker

    12 Oct 2017 Platte City Missouri 9065C
    Edited 8 months ago by 9065_Parker

    @Mira Don't put all the motors on the main beam that is connected to your chassis (unless you are that top 0.1% that somehow has the magic ability to make a good lift with that motor positioning).

    ohshiz, i didnt realize i was the top .01%. Nice

  6. Dokkaebi

    12 Oct 2017 Deal with it I like chocolate

    @9065_parker ohshiz, i didnt realize i was the top .01%. Nice

    Praise parker!! All hail parker! King of DR4Bs!!

  7. Team80_Giraffes

    12 Oct 2017 Event Partner Downingtown, PA 80[A-Z]$|81[A-Z]$|90[A-Z]$|91[...

    The motors on the part connected to your base has a distinct advantage of making the linkage lighter. Many people put the motors on the middle arm that moves, but I have seen several good DR4B with the motors on the base.

    You do want to experiment with different ways of compacting the space between the 5 bars that are your base and the c channels as the arms. Making this as small of a distance as possible helps with some twist elimination.

  8. Vexly

    13 Oct 2017 Suspended

    @9065_parker ohshiz, i didnt realize i was the top .01%.

    He said top 0.1, not 0.01%.

  9. 9065_Parker

    13 Oct 2017 Platte City Missouri 9065C

    @Vexly He said top 0.1, not 0.1%.

    the difference is negligible, all this means is that im good apparently

  10. puzzler7

    13 Oct 2017 Peoria, Arizona 8452A

    @9065_parker the difference is negligible, all this means is that im good apparently

    *makes it to Round Robin*
    *doesn't consider self good*

  11. 9065_Parker

    16 Oct 2017 Platte City Missouri 9065C
    Edited 8 months ago by 9065_Parker

    @puzzler7 *makes it to Round Robin*
    *doesn't consider self good*

    if eye consider myself good, then aye wont work as hard as possible, if eye dont, then eye wont get to worlds. eye cant do that ya know, it would make me very sad. eye would also be very sad and bored until the next game comes out
    tldr: self worth=overrated

  12. Dokkaebi

    16 Oct 2017 Deal with it I like chocolate

    Parker's "I" capitalization game is 10/10

    @9065_parker if i consider myself good, then i wont work as hard as possible, if i dont, then i wont get to worlds. i cant do that ya know, it would make me very sad. i would also be very sad and bored until the next game comes out
    tldr: self worth=overrated

  13. Deleted 8 months ago by 9065_Parker
 

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