pic: FRC 1771 Drivetrain

[Cory]

Originally Posted by Dancin103

Other than needing to loose a few pounds, i would say it looks good. Keep up the good work.

35 pounds is a very admirable weight for a rolling drivebase. Very few teams have made theirs lighter.

[sdcantrell56]

I don't know of any place to purchase 5" plastic wheels from other than colson wheels which are not hey keyed and which do not allow for tread attachment. Also the price of $70 is not per wheel that was the approximate price that itwould cost us to make 12 wheels, enough for 2 robots.

Has anyone actually tried broaching UHMW or any plastic for that matter? I would think it wouldn't be a problem but if that is not the case then I have to change my plan.

I agree and was under the assumption that anything under 35lbs or even 40lbs is a light drivetrain. I now have 2 drivetrains designed under 35lbs, one cantilevered and the other using plates and standoffs.

[Madison]

Originally Posted by Cory

35 pounds is a very admirable weight for a rolling drivebase. Very few teams have made theirs lighter.

Our '08 drivetrain was 35 lbs. with electronics. Making it lighter would require so much additional work that it's probably not worth it, but that doesn't mean we're not trying.

Of course, it's quite a bit easier to hit these low weights when you drop a CIM motor or two.

[=Martin=Taylor=]

Originally Posted by M. Krass

Our '08 drivetrain was 35 lbs. with electronics. Making it lighter would require so much additional work that it's probably not worth it, but that doesn't mean we're not trying.

Of course, it's quite a bit easier to hit these low weights when you drop a CIM motor or two.

...and the pneumatics.

[sdcantrell56]

Exactly. If we dropped a cim per transmission this would automatically be 5.5lbs less. Also the spur gear style transmission is heavier than a dewalt. Additionally this frame has more metal than yours. It is true we could possibly shave ~1-2lbs out of the frame, but the amount of machining might not be worth it if we know well ahead of time that we will make weight. A ~30lb drivetrain is imo very light particularly with a 2 speed transmission and 2 cims.

I am working on an updated version that uses custom hubs in the wheels and that has some more details added and Ill work on getting it up soon.