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#16
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Re: pic: Team 2502 Chassis Teaser
Quote:
4 Cims is 10 Lbs. 4 6" Mecanums is 6.2 lbs. 4 gearboxes is anywhere from 6-10 lbs. Making your frame only 12.8 lbs. max Our frame is pretty bare essentials out of aluminium and its at 18lbs. |
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#17
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Re: pic: Team 2502 Chassis Teaser
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#18
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Re: pic: Team 2502 Chassis Teaser
That's pretty cool. Though I honestly don't know why it has to be that light for it to be considered a "good" or a balanced robot
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#19
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Re: pic: Team 2502 Chassis Teaser
It really doesn't need to be, it just happens to be what we decided to use for strength and the light weight.
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#20
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Re: pic: Team 2502 Chassis Teaser
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We have aluminum and steel welding machines here. and steel welding is so much easier. |
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#21
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Re: pic: Team 2502 Chassis Teaser
Last year we used 1 inch steel tube and this year it is 3/4 inch with 1/2 inch supports. Everything holds up great!
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#22
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Re: pic: Team 2502 Chassis Teaser
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But someone earlier brought up low CG -- and yes, that's one of our main focuses. We are doing direct drive with Banebots Planetaries and we're trying to achieve super low CG. |
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#23
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Re: pic: Team 2502 Chassis Teaser
Quote:
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#24
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Re: pic: Team 2502 Chassis Teaser
One of the heftiest frames I have seen this year.
I'd be interested in the wall thickness and alloy you are using as well. |
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#25
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Re: pic: Team 2502 Chassis Teaser
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I've made FSAE car frames with largely .065"/0.045" walled round tubes. 0.035"x0.750" square tube would be plenty strong enough for a FIRST robot. And no strength loss from welding FTW! Unfortunately my team didn't have the facilities to make a frame like that this year ![]() |
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#26
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Re: pic: Team 2502 Chassis Teaser
your really going to regret using 80/20
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#27
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Re: pic: Team 2502 Chassis Teaser
Team 1208 loves 80/20.
Our completed robot this year has a kicker, lifter, ball collector and climbs the bump. It just weighed in at 116 pounds. |
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#28
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Re: pic: Team 2502 Chassis Teaser
Can you provide a reason for saying this? If you have a valid reason (bad experience, finicky connections, stuff like that), then by all means post it. If you're just saying this to say it, then it might be better not to say it.
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#29
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Re: pic: Team 2502 Chassis Teaser
We've been using 80/20 since our rookie year without a problem. (Well we've had problems but it was a human-fault). So any evidence or warrants behind your statement?
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#30
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Re: pic: Team 2502 Chassis Teaser
80-20 can be a fine material to use for a frame
so can many other things... One of the neatest things in FIRST is that there is no ONE RIGHT WAY to do anything!! My own experience with 80-20 was from my own mistakes early on... I didn't make sure everything was always tight.... or use lock tite on the connections... When my old team started using 80 20 by bolting through and making our own brackets we had much better success... I really like the comments I am hearing about using steel tube... I think we will investigate that next year.... sounds like an interesting solution.... thinner steel vs thicker aluminum Ease of welding.. vs difficult welding... Worth looking at.... it must work.... thousands of bicycles and cars use it thanks for the great suggestions... Your 80-20 frame looks pretty cool!!! good luck and we will see you on the field!! |
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