Team 1014 used a chain driven telescoping arm this past year. What we did was we had our sprockets on the outside of the larger box of the arm, and the chain would actually run inside this larger box. In the smaller, telescoping part we had holes tapped in 2 places that we put a small screw into that also went down through the #25 chain. The length of the telescoping motion prevented the screws going through the chain from ever getting to the sprockets. This worked surprisingly well. It never broke and when we needed to take the telescoping part of the arm out it was very quick and simple.
Some pictures:
This is looking up the inside of the larger box without the extension in it.
Overview of the robot (you can see the chain routing)
Unfortunately I don't have any pictures of the attachment of the extension to the chain and I don't really have access to our robot to take a picture for you. Feel free to look around our gallery at
www.dublinrobotics.com to see if there are any other pictures that can help you out.
__________________
FIRST Mid-Atlantic Volunteer (2012-present)
Team 1014 Alumni (2004-2005)
Team 1712 Mentor (2011-2015)
So once and a while no matter how addicted you may be, try to think outside the 48'x24' box of FIRST. - Tytus Gerrish [more] 
04-06-2005, 00:20
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