612 What is this?

[ravichauhan]

http://db.tt/YV01D2c

Can you guess what it is?

[Gdeaver]

It's a Mcmaster Carr shipping plastic bag.

[Mr_I]

Ah, it's an allen wrench on a McMaster Carr bag.

[Tom Ore]

Looks like an adjusting mechanism of some sort. Also, from the picture I can tell that the house the picture was taken in has a couple of basketball courts and a track right behind it.

[Jeffy]

Tensioning device! You are using chains or belts on your robot!

[JesseK]

Chantilly began using belts on their drive trains a couple of seasons ago, so I wouldn't be surprised if they're belt tensioners. Pretty crafty ones too.

[Mike Q.]

Based on the size, beefyness and teflon tape. My guess is either a piece of square aluminum slides in between the rollers or these pieces slide on a piece of square aluminum. Elevator or telescoping arm maybe?

[Lil' Lavery]

Chantilly began using belts on their drive trains a couple of seasons ago, so I wouldn't be surprised if they're belt tensioners. Pretty crafty ones too.

Yup. They've been using belts since 2007, iirc. Definitely a belt tensioning device for their drivetrain.

[dannydutton]

Based on the size, beefyness and teflon tape. My guess is either a piece of square aluminum slides in between the rollers or these pieces slide on a piece of square aluminum. Elevator or telescoping arm maybe?

Correct. We are using belts though but ones not long enough to require tensioners.