4 bar

VEX V5 Technical Support
1

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

Do you guys have v5 or the old cortex?

3

V5

4

@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

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

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

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

rd4b is just two four bars linked together

10

but reversed in the middle using a linkage or gears

11

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

12

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

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