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Re: pic: FRC 1771 Drivetrain
Im hoping I can get this drivetrain under 30 lbs. I havent made one yet that could actually function that was that light. Im working on a single speed version in case there is no need for a shifter like this past year.
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Re: pic: FRC 1771 Drivetrain
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For the record you CAN buy 5" plastic wheels for less than $70. |
Re: pic: FRC 1771 Drivetrain
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Re: pic: FRC 1771 Drivetrain
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Re: pic: FRC 1771 Drivetrain
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. |
Re: pic: FRC 1771 Drivetrain
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Of course, it's quite a bit easier to hit these low weights when you drop a CIM motor or two. :) |
Re: pic: FRC 1771 Drivetrain
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Re: pic: FRC 1771 Drivetrain
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. |
Re: pic: FRC 1771 Drivetrain
The frame looks great, nice and simple, and the bumper mounts are a very clever approach. I'd avoid cheese-holing it if I were you... It's already very light! Just put as much thought into your mechanisms as you did into this drivetrain and you won't have any weight problem at all.
And belts are awesome! Quote:
http://banebots.com/c/WHB-HS6-498 |
Re: pic: FRC 1771 Drivetrain
Those wheels are definitely worth a look however I am going for something with a bit more traction (roughtop). I am also debating doing a finesse version of this one using custom omni wheels in the corners and a center traction wheel plus single speed. I just finished my single speed and with it I have gotten this drivetrain under 30lbs (~29.5)
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