this is how it works, we are working on uploading a final cad version as well as some vids on the workings of it
https://vexforum.com/attachment.php?attachmentid=8363&stc=1&d=1398960750
if you cant read the txt
red:This gear does not move and is attached to the plate below it
blue: these gears turn each other to stay at the same degree (of rotation)
green: the sprockets connect to the gears (10:1 gear ratio) and rotate around the stationary 60 tooth (the red arrow points to it)
Thanks guys for all your work! Our team has been seriously considering using a modified johnny lift this next year.
LOL! Why not Forrest lift?:(
Yes, I certainly agree that a 6bar will go extinct (this year at least) there is no way it can reach that high. I think the wn result for the successful teams will be a scissor lift. My team has perfected a design on it and will be using for the next years game. And a. Point on the āDanny liftā, I think it is not a sufficient design and thought it works somewhat similarly to a scissor lift, it looks too unstable. To get to the desired hight it would take like 4 or 5 levels of that lift (more contributing to the unstable-ness of the design. I also feel that because of where the arm ends when extended it will make the robot tip.
These however, are just first impressions on the lift as it wpuld be needed for skyrise. I would like to see te design on a real robot though, just out of curiosity.
The lift is actually quite stable if you use the right spacers and get the right spacing with everything. The center section has almost no twist in any direction and the bottom will only move side to side with a poor directional load, or a single lift, instead of pairs on either side, Based on all my tests compared to the scissor lift, this proves far more stable with an plethora of other advantages(highlighted above, esp posts 4 and 15) Also, you should be able to get 70 in + chassis with just 2 of these. It will be possible to make it very stable.
As soon as I have it on a robot, I will post more pictures.
Iāll be honest, I was skeptical at first. This is probably one of the better (I try to refrain from using best) bar lifts Iāve seen. It looks to have some of the least center of gravity changes, ignoring up/down obviously Iāve ever seen in a bar lift. It can also go to nearly vertical - most bar lifts canāt do that because of overlapping. That can, of course, be remedied, but not ānativelyā like this bar lift can. The only thing that leaves me skeptical is how strong the lift is - I canāt tell if itās weak and what happens when any sort of stress is put on it.
Thanks for the compliment, I had spent a good part of last year designing it, also since I was a team of one I did most of the work (with a bit of help from inspector gadget haha)
The strength of it was really surprising to me after I had tried several different variations, for the last competition I used a 10:1 gear ratio and since both levers move up at the same time its speed it similar to a 5:1 gear ratio lift (applies to levers or close to 6 bar lifts) it could easily lift 3 bucky balls without slowing down and no rubber bands assisting it (note that the intake I created was trash and could have been lighter :p)
Hopefully we can get some actual numbers for you guys so you donāt have to just take our word and ofc you could try to make a mock up of the lift and test it yourself.
Thanks for your input! I might try this out now, I still would love to see it on a fully functional robot though.
Thatās actually pretty cool! Whether or not itās been done before, congratulations for thinking outside the box and coming up with something new. Iāve never really thought of staggering the bottom points of a 4/6-bar like that. You built a nice way of providing linear up-and-down motion, something that most lifts donāt do. Nice job 
We talked about it and we are going to go with a forrest lift XD (though for the record I have no clue what we are actually going to do lol)
What the heck is a Forrest lift? Iām guessing it is some lift that has existed for a long time that someone named after themselves some time in the last couple of years.
Describes a lot of lifts Iāve seen. Donāt know what the fascination is with naming previously done lifts after yourself.
A Forrest lift is just the clawbot lift! LOL! 
Yeah to everyone who wants to know what a forest lift is just look closely at the Skyrise reveal video ROFL
It uses these special new C-channels that extend to several times their starting length, without any visible difference between it and a normal C-channel. Thereās one in the game manual, see fig. 22 on page 15.
I made a video describing how this lift specifically works!
Check it out on https://www.youtube.com/watch?v=gbV0f4K5jYM
I was skeptical about this at first but now I am thinking it may be pretty good. Itās definitely something to play around with and see if it gets you better results. Thanks for sharing.
This looks like it could use a ton of motors. Do you want to allocate 4 motors to a double set of lifts like this? Weāve had two motors geared for speed on a 64" scissor in gateway.
How are the sides held together? I donāt see any cross bracing in the CAD/you tube video. The 60 tooth gears and the 1x5x1 c-channel only leaves a few spots for connections that might torque a bit in ways you donāt want it to.
How can you get good rubber band/elastic band assist on this? The spacing between the bars is typically best versus over the shoulder where they tend to get chewed up by gears and the like. That space can also be valuable for staying in the 18" box.
Example from the top rear corner.
P1020286
Earlier this year I built a six motor 8 stage scissor lift geared 1:7 that reached 7.5 ft. But it got disassembled because I couldnāt get over the bump and I had no intake.
This lift honestly wastes possible room to reach. Mounting the arm at the top of a tower and on the diagonal should allow you to reach at least a foot higher per four bar, all while not even needing to vertical like this lift does ā¦ Imagine if we mounted our current idea of a four bar at the base of the robot. There is a lot of reach being wasted by making the arm start horizontally.
With this lift, my robot should reach a max top height of ~11ā.
I do admit it does waste a little room, but that is a sacrifice I am willing to make.
Team80_Giraffes, I will answer all your questions in a few, I have to go ofline for now, but will post by tomorrow afternoon.
