#25 & #35 chains

[jacob07]

Originally Posted by B Toth

We have always used #25 chain on our drive trains. We have never had a problem with it breaking or anything. We even used it with the large CIMs from last year, and they held up through 3 competitions. I have found that #35 is too heavy and is relatively unnecessary for the robot.

my team came to the exact opposite conclusion. Though it may be heavier it takes stress better. The smaller chain seemed to break more then the larger chain did. If our robot was over weight due to chain weight then we lost the weight other places.

[clean399]

Team #399 has been using #25 chain for our drive systems and other mechanisms and we have had no problems that I can remember other than not being able to find a master link in our shop because it is small. We also find that since our robots come to the edge of the weight limit like last year we were exactly 120.0 pounds it saved us that little bit of weight.

[Andrew Blair]

Whoa, this seems like about the ninetieth time I've answered this.

In FIRST, more often than not, #25 is quite adequate- almost never breaking or giving problems- if it's tensioned and aligned very well. If not, you're playing roulette, and it will fail, at some point. Maybe sooner, maybe later, maybe seven times at the Pittsburgh regional in 2006.

My suggestion, use #35 from the gearbox to your first wheel, and then you can use #25 after that. If it breaks, you're still moving.

[eshteyn]

Originally Posted by Andrew Blair

Whoa, this seems like about the ninetieth time I've answered this.

In FIRST, more often than not, #25 is quite adequate- almost never breaking or giving problems- if it's tensioned and aligned very well. If not, you're playing roulette, and it will fail, at some point. Maybe sooner, maybe later, maybe seven times at the Pittsburgh regional in 2006.

My suggestion, use #35 from the gearbox to your first wheel, and then you can use #25 after that. If it breaks, you're still moving.

I couldn't agree more with your answer. We have used #35 chain on our drive system mostly because we are a great defensive robot as well as offensive. We dish out as much as we receive and we select our chain by logical reasoning. We analyze the history of playing of teams at regional events we go to as well as our calculated speed and the estimated speed of the opponent. We calculate the forces on the drive system during regular operation and impact operation and then we select our drive chains. As my physics teacher yells when he smacks his ruler on the desk "IT'S PHYSICS!!!!!!!!!!!!!!!!!!!!!!"

[b-rant]

you should have a poll but #25 I believe is the best solution for FRC if done correctly, if not you may slip.

[Superstitions]

In comparing the chains for our arm we are trying to find out how much #35 and #25 weighs per foot. Googled it and could not find the specs. Maybe someone who has a scale handy could weigh 10 feet of it.
Thanks, Jeff

[Richard Wallace]

#25 -- 0.09 lb/ft

#35 -- 0.276 lb/ft