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 Well, it worked in inventor . . . - Chris Fultz [more] |
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This is our 80/20 Chassis!
Discussion
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06-02-2010 18:11
keehun
Re: pic: Team 2502 Chassis Teaser
How heavy is heavy? With gearboxes, motors, electronics, the calculated weight is 50lb...
And I can lift this with one arm. Easier to lift with two arms..
06-02-2010 18:27
Techgirl675
Re: pic: Team 2502 Chassis Teaser
For sake of comparison our chassis with 4 CIMs, mechanum wheels and all 4 gear boxes is less than 35 pounds...
For what it's worth, we've gone the 80/20 route. While it's great for prototyping and testing, we've found it's far too heavy for competition use. We've since switched to welded thin-wall steel tubing and it seems to work quite well.
06-02-2010 18:34
Timz3082
Re: pic: Team 2502 Chassis Teaser
It does look a bit heavy, But it also looks very strong! Good work from team 3082 (Minnetonka)! I can't wait to see this at 10,000 Lakes! What drive train are you using? It looks like it could be a swerve...Well I gues I will see in two months 
06-02-2010 18:56
Chris is me
Re: pic: Team 2502 Chassis Teaser
Nice chassis. One of the coolest uses of extrusion I've seen so far. Though that's not saying much. That's a lot of material, but it's material fairly low, which should be good for your CoG.
I'm intrigued with the wide orientation. Can't wait to see the rest of it, so I know why you guys took that route.
06-02-2010 19:06
Akash Rastogi
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by firemaster193
it seem too heavy
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06-02-2010 19:06
Jonathan Norris
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by keehun
How heavy is heavy? With gearboxes, motors, electronics, the calculated weight is 50lb...
And I can lift this with one arm. Easier to lift with two arms.. |
06-02-2010 19:19
dragon72950
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by keehun
How heavy is heavy? With gearboxes, motors, electronics, the calculated weight is 50lb...
And I can lift this with one arm. Easier to lift with two arms.. |
06-02-2010 19:23
Chris is me
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by dragon72950
calculated weight do you know how heavy it actually is or have you not weighed it yet?
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50lbs with all electronics is plenty light, I think. Personally aiming for a 70 pound lower deck / 110 pound robot.
06-02-2010 19:26
dragon72950
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by Chris is me
Most of the parts he named aren't on the robot yet, so it's hard to weigh the final configuration.
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06-02-2010 19:29
V_Chip
Re: pic: Team 2502 Chassis Teaser
Looking good 
Interested on the wide base configuration
06-02-2010 19:38
EricH
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by dragon72950
well he could do what we did and just put the stuff on the scale with the chassis
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06-02-2010 21:54
keehun
Re: pic: Team 2502 Chassis Teaser
I will weigh it this coming monday.
And we do have a very interesting wide-configuration that will be super weird but we hope to have work out!
And no swerve this year. We thought that whatever we could make would have too low of a clearance to go over the bump.
Hm, did I give too much away?
07-02-2010 13:18
Jeffy
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by Techgirl675
For sake of comparison our chassis with 4 CIMs, mechanum wheels and all 4 gear boxes is less than 35 pounds...
For what it's worth, we've gone the 80/20 route. While it's great for prototyping and testing, we've found it's far too heavy for competition use. We've since switched to welded thin-wall steel tubing and it seems to work quite well. |
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.
07-02-2010 13:42
Techgirl675
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by Jeffy
WOW!
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. |
07-02-2010 15:52
keehun
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by Techgirl675
We have a welded steel tube chassis and it is only 10 pounds including all of the supports.
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07-02-2010 15:57
Techgirl675
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by keehun
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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07-02-2010 17:23
Jeffy
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by Techgirl675
We have a welded steel tube chassis and it is only 10 pounds including all of the supports.
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We have aluminum and steel welding machines here. and steel welding is so much easier.
07-02-2010 17:40
Techgirl675
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by Jeffy
Would you mind sharing the size and alloy of the pipe?
We have aluminum and steel welding machines here. and steel welding is so much easier. |
07-02-2010 18:03
keehun
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by Techgirl675
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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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.
08-02-2010 07:28
dragon72950
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by keehun
I will weigh it this coming monday.
And we do have a very interesting wide-configuration that will be super weird but we hope to have work out! And no swerve this year. We thought that whatever we could make would have too low of a clearance to go over the bump. Hm, did I give too much away? |
08-02-2010 07:52
Dave McLaughlin
Re: pic: Team 2502 Chassis Teaser
One of the heftiest frames I have seen this year.
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Originally Posted by Techgirl675
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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08-02-2010 09:03
JamesCH95
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by Techgirl675
We have a welded steel tube chassis and it is only 10 pounds including all of the supports.
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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
09-02-2010 13:49
team1718
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by keehun
How heavy is heavy? With gearboxes, motors, electronics, the calculated weight is 50lb...
And I can lift this with one arm. Easier to lift with two arms.. |
09-02-2010 14:12
EOC
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.
09-02-2010 17:34
EricH
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by team1718
your really going to regret using 80/20
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09-02-2010 18:11
keehun
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by team1718
your really going to regret using 80/20
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09-02-2010 19:41
Bob Steele
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!!
09-02-2010 22:22
keehun
Re: pic: Team 2502 Chassis Teaser
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Originally Posted by Bob Steele
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!! |
Our dream has always been able to weld a clean aluminum/steel tubing together to make one of those sick chassis that are awed everywhere, but we currently don't have any way practical method or place to weld, nor do we have the experience to. That's our long-term goal -- to make a sick and clean aluminum/steel tubing chassis. But until we get enough practice over the summer or something, we're sticking with 80/20 since it's so easy to get cut and assemble (assemble not so easy but probably easier than welding at this point).
Thanks,
Keehun
09-02-2010 23:15
Lil' Lavery
Re: pic: Team 2502 Chassis Teaser
This teaser made me want to get a burrito.
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