Sack Attack Chain Bar Lifts

Hey all!

I have seen LOTS of chain bars this year for Sack Attack. Just wanted to know some info on what you guys are doing with them.

What gear ratio’s are you using on your Chain Bar? How many sacks can you lift?

Where have you put elastics to help lift the arm? Do you have any tips on how to make the chain bar better?

Thanks!

Make a tank tread bar instead :stuck_out_tongue: you would be original haha

And if you use the ones with holes in them you could wire tie them together to make it stronger :slight_smile:

Hopefully, someone from 1471 will post. Their members are active on the forum and they built an excellent chain bar this year. You can see some of it if you search the thread about their robot.

https://vexforum.com/gallery/showimage.php?i=5476&catid=member&imageuser=22555

Darn it! (Please lengthen your post to 10 characters…)

I’m pretty sure the Lynfield team also used rope attached at the ends as a backup in case the chain broke. I think they also cable tied the chain links together when they changed from tank tread -> chain, where possible (so the main lengths, jut not at the bits that went on the sprockets). I might be mistaken about that though. It was a while back :stuck_out_tongue:

~George

I haven’t used a chain bar in sack attack, but it seems like a very effective lift for the game.
-light
-reaches the high goal
-a lot of reach distance over the trough
-can be made to go under the trough
1:7 and 1:9 seem to be the most common gear ratios. Most of the chainbars I have seen tend to be quick and efficient rather than high capacity.

That was my issue with the chain bar a while back. With a lot of sacks the chain bar will flex end of story.