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Unread 23-10-2015, 19:40
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jman4747 jman4747 is offline
Just building robots
AKA: Josh
FRC #4080 (Team Reboot)
Team Role: CAD
 
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Re: Which kind of Aluminum is a good choice

Quote:
Originally Posted by AdamHeard View Post
It's easily a 7 lb weight difference if you add up all the gears, sprockets and shafts on an average FRC robot.
Well you don't make everything out of steel. In 2015 we needed 6 #35 sprockets. Five 12t and one 15t. A guy had 2 brand new Martin Gear 12t #35 hub sprockets in his back yard and we had one vex pro 15t 7075 hub sprocket left over. As for the last two, one of our sponsors lets us send him a mcmaster PO each season and we got the last two as part of that (also Martin Gear).

So why then would we spend $28 plus shipping and tax to get 5 12t #35 sprockets from Vex to save ~5lbs when we spent $0 on a mix of steel and aluminum. Finally the steel sprockets from Martin Gear will all last longer than the aluminum one thus adding to long term savings. In the end we were nowhere near 120lbs. Weight isn't everything.
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