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Unread 03-05-2012, 08:22
jwfoss jwfoss is offline
Chasing Elegant Simplicity
AKA: Justin Foss
FRC #0558 (Elm City Robo Squad)
Team Role: Mentor
 
Join Date: Aug 2006
Rookie Year: 2003
Location: New Haven, CT
Posts: 592
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Re: Dual CIMs and #25 Chain

One of the primary rules on FRC2168 is that we have to move. If you can't move you can't do anything.
With that we also believe that testing new things in the drivetrain in season is not allowed.

Our 2012 drivetrain consisted of:
  • 8WD
  • Non-Direct Drive
  • AM Shifters (2 CIMs Each)
  • 5"x1.5" Colson Performas (on WCP hubs)
  • Dead Axles (3/8" Grade 8 Bolts)
  • C-C distance for exact chain length
  • Spacer/Tensioner Combo (1" Nylon rod stock with non-concentric thru hole)
  • #35 Chain
  • AM Aluminum Sprocket
We built the drivetrain during week 3 of build season, and haven't done anything except check tension and grease the gearbox.

Is this fairly old school? Yes. Could we switch to #25 chain? Yes. Why haven't we? Because we know that our tolerances are not always the best, and #35 chain is really forgiving.

Based on your posts, I strongly suggest designing for c-c center distance and integrating a different tensioning method. Most problems people have with #25 chain is misalignment and improper tensioning.
__________________
2003-2006 | FRC 0176 | Aces High - Student
2007-2010 | FRC 0229 | Division by Zero - Mentor in Training
2011-2013 | FRC 2168 | Aluminum Falcons - Mechanical Mentor
2013-20xx | FRC 0558 | Elm City Robo Squad - Mechanical Mentor

Last edited by jwfoss : 03-05-2012 at 08:26.