I need some help building a 6 bar.
I understand how to build a 4 bar, I just can’t figure out a 6 bar from the pictures I have seen.
Does anyone have a top view of a 6 bar lift mechanism?
Thanks!
First if you have not seen this thread:
https://vexforum.com/t/guide-to-six-bars/19334/1
Go to it. It is the guide to 6 bar (or extended 4 bar depending on your terminology) and the AURA website is very nice.
As for building a 6 bar:
Our team took our first dive into building on also and it really is quite simple. It is very similar to building two 4-bar lifts stacked on top of each other, connected by a vertical bar. If you look at the photos on the AURA website, you will see what I mean. If you still need help, and no other more advanced builder answer your question better than I can :p, I could whip up a diagram to show you what I mean.
William
It is simply 1.5 four bars. It is just a linkage in the middle i think that is confusing you. Here is a pic of one CADded
Hope this helps
Thanks guys! That helps a lot!
As WilliamG said, reading the guide should be helpful, i did spend a bit of time writing it 
PM me if you have any questions!
I figured it out! Thanks all!
for the poll, add a “five bar” (that what ill be calling it)
you’ll see why when we reveal it before our competition 
By now you most likely understand what it is, so I won’t go into that. However, I do want to say that 6-bar is definitely not the correct term for this linkage. If you’re going to give it a number, it would be a 7-bar. Not a 6-bar, not an 8-bar, a 7-bar. If you look up the definition of a 4-bar linkage, and look at an image of a 7-bar or see a robot with a 7-bar, you will then see why it is named such. Or simply call it an extended 4-bar, though I tend to lean towards 7-bar.
~Jordan
I suppose it would be safe to call it a “I-don’t-know-how-many-bars-it-has-it’s-the-one-with-that-thing” bar linkage.
One interesting thing of note that someone might be able to use is that the linkage looks remarkably like a scissorlift when viewed at a certain angle. Some parts of it may not be symmetrical, and it rotates as it extends and contracts, but it does look like a scissorlift.
“There are NO things in robotics”…
Not quite. As he mentioned, it actually should be called a 7 bar, but that is just an arbitrary name us vex people have assigned to the particular linkage because it doesn’t really exist in real life. But it actually should be called a 7 bar because there are 7 bars.
maybe you should add a 2bar to the pole? hint hint
im pretty sure that a 2 bar is physically impossible to achieve. Do you mean a single 4 bar? Even in that case I don’t see any advantages over the normal 4 bar linkage used.
its lighter lol
i called this a 2 bar because it had two bars
i know that “technically” it still has 4 points of pivot, but it was the only way to distinguish between that that the conventional “4-bar” without showing pics
Yes, but you can simply say a “single 4-bar linkage” or (in most cases, I guess) a “dual 4-bar linkage.”
~Jordan
Or you just make a proper 2 bar… (hint hint) :rolleyes:
We call them “Double bar link(age)s” because there are the two bars that rotate (a double arm). By dual 4-bar linkage, you just mean two 4-bars next to each other?
I’m pretty sure that its impossible to have only 2 points of pivot in a linkage. I could be wrong
I’m sorry for the confusion, but I meant a 2 bar as not a 4bar but just an arm that raises and is not level with the ground, but just a bar that holds manipulators and goes up and down. Also, have any of you guys seen this? http://data:image/jpg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAkGBgwPERAPDA4NDw8OEA4QDxAPDRAQDQ8NFRAVFBMQEhIXHCcfFxkjGRITHy8gLycqLSwyFh4xQTA2NSYrOCkBCQoKDgwOGg8PGCwiHB0wNSwsKSk0LTUtLC8pMC0sLCkpLDUsKSkpLCksLC0sLCwsLDUtKSksLiw1NCw2LywpKf/AABEIAOQA3QMBIgACEQEDEQH/xAAbAAEAAQUBAAAAAAAAAAAAAAAABwIDBAUGAf/EAEEQAAICAAMDBgsFBQkAAAAAAAABAgMEERIFBiEHEzFBcXMiMjNCUWFyobGysxQjNIHBkZLCw9EVJFJidIKDouH/xAAaAQEAAwEBAQAAAAAAAAAAAAAAAgQFAQMG/8QALhEBAAIBAwAHBgcAAAAAAAAAAAECBAMRMRIyQUJRcfAFITOBkdETFCIjscHh/9oADAMBAAIRAxEAPwDUgA+nfMAB7CDbSSzbaSXpbeSQHgNzPc7ai6cHc/Z0y+DMazd3Hx8bCYpf8Fj+CIRqUniYTnTvHMS14L9mBvj49N0faqmviiw1l08O3gS3iUdpgB4menXAAAAAAAAAA8bA9BhR2tTKeiDc2nFSlHJwjm8lm8+PFpcM+kzSFdSt9+jO+yVqWr1o5AATRAAAAAAAAAAAPYTcWmulNNdqeaPAB1FXKRtOPjOiftU5fK0ZlXKli14+Hw8vZdkP1ZxYPCcbSnuveMnVjvJAq5Vl5+Ef+zEfo4mTDlMwMvK4e9flXNfEjYHnOHpeD0jM1fF1W/u1NnY/CaMG3Tiq7K7K26nVqXGM4SnHq0yb7YojV7M2pHxbNXs4qt+6UkdACE4Vey0wlGZPerEue5rbC6K8RL2a42fKmWZ7V2jX5SE495h3H9EdNki5C6a8Wc12Sa+Bz8pqRxqT6+aX5rTnnTj18nW7m7rYDaOCoxOu+NklKNyhOGlXQk4yyTi8lwTy/wAyNHyj7H/smNFtOq6q6U65uxpShYkpRScV0Na/3THw22MXV5LEXwTebUbZJN+lrP1Hm1Nr4nF18zjLHfVqjPRYk8ppNKSaWefF9fWc/ByI4u7+NjzzRyMd8I+dS/ysX9C9He/D+dC1flF/qZN27eDl0VuHsTl/E2Ylm6FPm22LtUZLP3Eejlx27/R3fFnsmPqyJbz4XS3BznKMdWnQ0/Xm3wWXWXt0eb2pfOjF85GE1GNMKV4POPXLOxtrhprlx9OXA1kd0nF5xtjL0aoNZPqfS8+w6K7ky23g6JW4fEYWMYrnpTpttqxOnT4jkorNdeWeRVyLa8x0dTifDt+i1jV0az09P3zHj/rbWcnWApolia5YjnKtc45vTHOE9OmcJJvpT6/Qas0eGs23zkefvxE6m4qzViNcXDPNp5vibwuYFLUrMWjZUz9St7RMTv5AANBngAAAAAAAAAAAAAAAAAAAAAAAAAAAADxku7ZWeBu/0s/pkRMkveLerZtGHlh7sVTG+2h1QpUtdzsnXpinCObjxa4vIz83rU8/s0MLq38vujddEvy+JSVw6Jdi+ZFBfhQkAB1wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAER7Gb+0pybb+0Jtt5tvnelskJEd28MQ/Ve/qGbnc09eDRweLevFI8OiXYvniUFcfP7P44lBowzwAHXAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAI6x7yxFnquk/wDuSKZ2yeQ62+yWIxuKjXVZJ2Qrw6c7ZQl4S1SkkodPokZuf3Wlgd5iQ8/2f44lBXX53sv4ooNGGcAA64AAAAAAAAAAAAAAAAAAAAAAAAAAAAAPGTZsj8PR3VXyIhNkv17bwuEwdF2MurorVNXhWSyzehcIrpk/Uk2ZufxVpez+bIliuM+yRbLimpOUovwZKbTyyzTTaLZoQzpAAScAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAj/eHaN111jutnY4N1w1yb0Vx4RhFdSyXQSARttPytveWfMzN9ocVaWBzZI+AecIP01fyyotbLedVfroX0S6X6qFgAE0AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAI32n5a7vbPnZJBsd2uRX7RJ4raNyVVsnZXTQ/DnCT1LXY14PB9CTfrRm+0OrVo4HNmn2O/uae4j9IvmbtLBV0Yi6mmOiumd1dcc29MIqSis3xfBIwi9p8R5QpX5nzkAB6PMAAAAAAAAAAAAAAAAAAAAAAAALmHw9lklCqMpzlnlGKzb4Zls2G79so4mlxyzlNQ4rNZS8F/EjadomYSpETaIllV7m7Tks/s0kvTKdcfc5Zl2vcnGvxuZj22N/BM7iKmujS/2r+pdjZPri/ykn8TNtk6s8bNWMPTjndwV+5eJis9dT/eXvyJJ2NW44eiL6Y01ReXRmoJGRZkk3oiuD6cl8CmvEVxhGUpwims83JKOXqbKurq3vH65WdLRppzvVGG9OzMRDE4m6dViplbY1Y4vm3qi8uJoCZa76rpZ12RnGEpJ6JRnBvR0S6U8s8yNt9YKOMsiuOmFCbySzfNRzbS4Ghja83nozHYz8rHikdKJ7f5aMAF5ngAAAAAAAAAAAAAAAAAAAAAAABm7F/EYfvqvnRhGZsb8RR31XzojbqylTrQlCJcRbRWjFfQre+U5LBYvSk88PcnnLLKLrlnLo4tLq6yGLm5NuXF59fo6icdvYPn8PdTq087VOvVlnp1Rcc8uvpOFq3Bp6bLreyEIxX70m37irfTta28R7ljSvWu/SbDkwf3Fnqvl9KBot+fxt3ZT9KJ227ezaMLBwqbycpSlrlFyz0pZtpLqRw2+k1LG3NNNfdcU015KBfwKTW20+H9szOn9v5tIADXY4AAAAAAAAAAAAAAAAAAAAAAAAZeyH/eKO+p+dGIZWy39/R31XzojbiUqdaEpZlSLZWjFfQtpfXqTXpRrVs+fWbYpZCLTDuzgt+adFS8FrVbX4TXj5Qn8P1OJJE5SPw9Xfr6cyOzWxZ302NmfEAAWVQAAAAAAAAAAAAAAAAAAAAAAAAMjZr++p72r50Y5f2f5WrvavnRy3EpV5hKZUigrRiPoW4KWenjPJ1yPKT+Hq79fTmR2SHykv7inv8A+XMjw18X4bGzPigALSoAAAAAAAAAAAAAAAAAAAAAAAAF7BP72rvK/nRZK6bNMoyyz0yjLL05NPL3HJ4dj3SlYqRpMDvXhLeDlzUn5tnBZ+qXR8DdRkms1xT6Guh9hi2ravMPoK3reN6zu3J4z3/wonJJZyaS9LeS/aeSbkeUnyFPf/y5EenccoO0sPZXVCq2qyUbXKShNScVoazeXrZw5r4sbacbsXLmJ1J2AAWVUAAAAAAAAAAAAAAAAAAAAAAAAAAAy8DtXEUeRtlFf4c84Pti+BiA5MRPul2JmJ3hvMVvrtKzhz+heiqEYe/LP3moxGKtsedtllj9M5ym/eWgcrSteISte1uZAASQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAf//Z
Yes, by dual 4-bar linkage I mean two 4-bars running in sync, typically on either side of a claw/intake mechanism. A double 4-bar (I know this is not what you call single 4-bar linkages, but it’s similar) I would consider to be two 4-bar linkages, one on top of the other, similar to Aperture Robotics’ lift this year, or Cody Smith’s design last year.
~Jordan