Hey guys I was just wondering…
What’s the BEST way to attach a 6bar to a tower?
-How would it create less stress on the gears and motor?
-Would this 6 Bar design even be good for Sack Attack?
I would love feedback PLUS Pictures if you have your own design!
Thanks Guys 
I’m not really sure what your asking there are some really good examples of 6 bars somewhere within AURA domain, but I do not have the links for it.
I’m trying to figure out like the best gear ratio to use when trying to attach my 6 Bar to the robot. Im kinda new to the idea of a 6 bar so I 'm trying to understand how to make an efficient way to reach the 30" goal…
This is what Andrew is referring tonhttp://www.aura.org.nz/archives/672.
Ohhhhhh 
Thanks guys
That helped a lot!
Are you guys doing any Bar Designs (4,6,8) for Sack attack?
We are mostly likely using a chain bar. http://www.aura.org.nz/archives/991
because of the 180 degree capability and it has all the benefits of an extremely light 6 bar. It is also really easy to add an angle change.
I think 2,4,6,8 bars will be the most common type of lift because people are going to want to have that option of going to the high goal and they’re generally easy to build(once you build one, you can pretty easily switch in between them all), but I personally don’t plan on using them.
This helped me build a 6-Bar linkage last year.
(Click on these two pictures to look at a bigger image if needed)
AURA also did a very good job at explaining how to build a 6-Bar, and information about it. Here is the link to that: http://www.aura.org.nz/archives/672
http://team323z.weebly.com/uploads/1/0/0/6/10062475/7617181_orig.png
Thanks for the help guys 
Now on your first two pictures it shows this circular red thing on it? What is that and what does that do?
you should also take into account the placement of your tower. If its too far back, it tends to tip backwards.
Potentiameter sensor to sense degrees.
The gear ratio one uses on an arm depends on 2 things:
For Gateway, teams with a 6-object capacity generally used 7:1 or 5:1, with lots of elastic to help lifting. Barrels and Sacks weigh about the same, so if you’re lifting a max of about 6 sacks, 7:1 or a compound 9:1 are good gear ratios to use. If you plan to lift more sacks than that, you may want to go into heavier compound gear ratios like 21:1 or 25:1.
I’ll add to that,
3. The number and type (total power) of motors you are going to use
I forgot to mention the video that Exothermic 10D put up. Here it is: http://youtu.be/rp8gDKTkC0g
They explain more about the 6-Bar. Hope this helps.