1. 2 months ago

    Hi! We are trying to build a 4 bar lift. Do you guys have any ideas of what how we should build it. Like the gear ratio maybe?

  2. Bhargav S.

    Oct 9 Maryland 952C

    Do you guys have v5 or the old cortex?

  3. V5

  4. Royal_Freedom

    Oct 9 Washington State 3249Z -- O.O.F.
    Edited 2 months ago by Royal_Freedom

    @4810B WAFFLE HOUSE you should need only one motor, I think 1:5 should work for most 4-bars. I haven't built one before (we will for the bot, I think), but that's the word on the street forum.

  5. Thanks @Royal_Freedom

  6. briancole

    Oct 9 Utah 4270C

    1:5 is good. Though based on our testing with good build quality and grease you should be able to do 200 rpm 1:5 on one v5 motor.

  7. Bhargav S.

    Oct 9 Maryland 952C

    Yeah, last year we had a 2 motor 393 fourbar 1:5 instead of RD4B, so one v5 with 1:5 should be good

  8. Royal_Freedom

    Oct 9 Washington State 3249Z -- O.O.F.

    @Bhargav S. Yeah, last year we had a 2 motor 393 fourbar 1:5 instead of RD4B, so one v5 with 1:5 should be good

    Real quick, what's the difference between RD4B and a simple 4-bar? Does it require different linkage or gearing?
    Apologies for my ignorance, I tried to look it up on the forums (via Google) but it gave me an unrelated thread.

  9. Vyx

    Oct 9 Florida 82987A

    @Royal_Freedom Real quick, what's the difference between RD4B and a simple 4-bar? Does it require different linkage or gearing?
    Apologies for my ignorance, I tried to look it up on the forums (via Google) but it gave me an unrelated thread.

    rd4b is just two four bars linked together

  10. Baguette123

    Oct 9 Earth 2775J

    @Vyx rd4b is just two four bars linked together

    but reversed in the middle using a linkage or gears

  11. Rick TYler

    Oct 10 Teachers/Coaches, Event Partner, V5 Beta Moderator Redmond, Washington Founder of Exothermic Robotics

    Here's a very short YouTube video of a simple DR4B in action.

  12. tabor473

    Oct 10 V5 Beta Tester OYES, WPI

    @Rick TYler Here's a very short YouTube video of a simple DR4B in action.

    I really like the video title. If I ever wonder "what was the video of the itz robot lifting on a table", it will be easy to find.

  13. Baguette123

    Oct 10 Earth 2775J

    @tabor473 I really like the video title. If I ever wonder "what was the video of the itz robot lifting on a table", it will be easy to find.

    Don't know if you were being sarcastic but that actually would be super easy to find

 

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