View Full Version : pic: Team 2502 Chassis Teaser
[cdm-description=photo]34719[/cdm-description]
Techgirl675
06-02-2010, 17:57
looks verrrry heavy...
firemaster193
06-02-2010, 18:05
it seem too heavy
:eek:
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..
Techgirl675
06-02-2010, 18:27
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.
Timz3082
06-02-2010, 18:34
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 ::safety::
Chris is me
06-02-2010, 18:56
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.
Akash Rastogi
06-02-2010, 19:06
it seem too heavy
:eek:
It depends on what the rest of the robot needs in terms of weight. 70 pounds is more than plenty for what they plan on doing, as far as I've heard their plans.
Jonathan Norris
06-02-2010, 19:06
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..
Trust us you'll be surprised how weight seems to adds up... fair warning just make sure you are careful how heavy the rest of your robots functions are.
dragon72950
06-02-2010, 19:19
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..
calculated weight do you know how heavy it actually is or have you not weighed it yet?
Chris is me
06-02-2010, 19:23
calculated weight do you know how heavy it actually is or have you not weighed it yet?
Most of the parts he named aren't on the robot yet, so it's hard to weigh the final configuration.
50lbs with all electronics is plenty light, I think. Personally aiming for a 70 pound lower deck / 110 pound robot.
dragon72950
06-02-2010, 19:26
Most of the parts he named aren't on the robot yet, so it's hard to weigh the final configuration.
well he could do what we did and just put the stuff on the scale with the chassis
Looking good :cool:
Interested on the wide base configuration
well he could do what we did and just put the stuff on the scale with the chassis
Some folks might not have a scale that will work for that.
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?
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.
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.
Techgirl675
07-02-2010, 13:42
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.
We have a welded steel tube chassis and it is only 10 pounds including all of the supports. :D
We have a welded steel tube chassis and it is only 10 pounds including all of the supports. :D
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
Techgirl675
07-02-2010, 15:57
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
It really doesn't need to be, it just happens to be what we decided to use for strength and the light weight.
We have a welded steel tube chassis and it is only 10 pounds including all of the supports. :D
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.
Techgirl675
07-02-2010, 17:40
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.
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!
It really doesn't need to be, it just happens to be what we decided to use for strength and the light weight.
Haha cool. Sorry if I sounded like I hated you or something. I don't!
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.
dragon72950
08-02-2010, 07:28
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?
well interested to see how much it weighs
Dave McLaughlin
08-02-2010, 07:52
One of the heftiest frames I have seen this year.
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!
I'd be interested in the wall thickness and alloy you are using as well.
JamesCH95
08-02-2010, 09:03
We have a welded steel tube chassis and it is only 10 pounds including all of the supports. :D
Welded 4130 steel (maybe 1020?) is probably the lightest possible frame construction barring composites, which are cost-prohibitive for FIRST. Alloy steel is better than 6061-T6 aluminum in nearly every regard...
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 :mad:
team1718
09-02-2010, 13:49
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..
your really going to regret using 80/20
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.
your really going to regret using 80/20 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.
your really going to regret using 80/20
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?
Bob Steele
09-02-2010, 19:41
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!!
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!!
Thank you!
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
Lil' Lavery
09-02-2010, 23:15
This teaser made me want to get a burrito.
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