Chain Driven Telescoping Arm

[David Guzman]

Team 1251 used a telescoping arm this year, it is pulled out with strap but you can apply the same concept with chain. In every place the strap bends we use UHMW rollers to reduce friction. We used a window motor connected to a pully to pull the strap, overall it works great, it is not as strong as chain but it served the purpose.

I made a quick sketch of how the straping goes. You can also find pictures of the robot here:

http://www.chiefdelphi.com/forums/sh...ght=techtigers

I hope this helps, and good luck.

Dave

[Ronald_raygun]

About this whole chain operated arms, does anyone know the concept behind team 233's arm? That thing went up fast.

[David Guzman]

Originally Posted by Ronald_raygun

About this whole chain operated arms, does anyone know the concept behind team 233's arm? That thing went up fast.

I'm pretty sure that the set up of the chain is very similar to the one I posted before, but their arm is so fast because they used two Fisher Price motors with a reduction that pulls the chain very fast. I was talking someone from their team and he was telling me that it could fully extend in 1.1 seconds, which I find amazing.

Dave

[Doug G]

We did something this year similar to what David described using nylon strap to extend our telescoping arm, I would strongly look at using a lighter material than chain. Chain may be good option if your planning to lift several hundred pounds, but for what we encounter, the nylon strap is more than adequate, easy and cheap to acquire, low friction if you use UMHW rollers, and you can have telescope stages within a 1/4" of each other. Ours is shown here .