How much does your robot weigh? [Archive]

c.shu

05-02-2014, 12:50

HumblePie

05-02-2014, 12:56

We project our total (functional weight) to be around 100 lbs. I have a soda on the "under". Our final weight will definitely approach 120 lbs. Why? One word: Ballast :D

Dan.Tyler

05-02-2014, 13:49

I am forseeing another sub-90lb bot coming to a regional near you.

Why? One word: maneuverability.

pilum40

05-02-2014, 14:06

As of last night...50 lbs without electrical and motor controller boards.

Dr.Gusta

05-02-2014, 14:12

With everything except one part which will end up weighing like 5lbs our robot is 63lbs. We are going to drive it with and without added weight and see what we like the best.

c.shu

05-02-2014, 16:14

Honestly did not expect anyone to vote for the 0-30 lbs option. I wonder what that bot looks like.

pntbll1313

05-02-2014, 16:38

Honestly did not expect anyone to vote for the 0-30 lbs option. I wonder what that bot looks like.

I'm pretty positive that is a joke... A better question would have been
-Under 70lbs
-70-90
-90 to 110
-110 to 120

chrisfl

05-02-2014, 16:38

Close to 120lbs
Why: sexiness and trying new drivetrain and other mechanisms(Like really sexy)

BobbyVanNess

05-02-2014, 17:20

We're approaching 120lbs much more quickly than any of us would like... But after all, μ*Fn=Ff, right? :D

BBray_T1296

05-02-2014, 18:43

We're approaching 120lbs much more quickly than any of us would like... But after all, μ*Fn=Ff, right? :D

Correct, more weight = more friction. It is very likely that low-gear 6CIM drives are traction limited, rather than torque limited, so while you are sacrificing acceleration (and possibly top speed) you are gaining a huge pushing advantage in the low gear

DampRobot

05-02-2014, 18:45

We're weighing it about 85 now and will probably ship at around 95.

AdamHeard

05-02-2014, 19:24

Honestly did not expect anyone to vote for the 0-30 lbs option. I wonder what that bot looks like.

How comp bot currently weighs less than 30 lbs.

azcalg

05-02-2014, 19:30

We were at 79 pounds when we last met, with a pneumatic shooter and a herder on either side and all the electronics and stuff. We've been working on a catapult powered by surgical tubing that'll add some functionality and we've estimated it'll add ~10 pounds at most. We're probably going to try and fit on a blocking device for playing goalie in the next couple weeks so we'll basically be able to apply every possible tactic and still be underweight =)
This is pretty exciting for us because last year we realized we were overweight the weekend before ship night and lost our full court shot in the process of making it lighter.

BBray_T1296

05-02-2014, 20:08

I think the new frame sizing rules (112" vs 28"x38") have really made it more trivial to achieve <=120lbs. It seems like less of a pressing issue to worry about weight, unless you are in more extreme circumstances (ie trying to do everything)

DampRobot

05-02-2014, 21:09

BBray_T1296

05-02-2014, 21:20

Last year the frame perimeter was the same, and it was a struggle for a lot of teams to make 120.

I meant the new rules since 2012 to 2013. Last year required robust enough systems for the robot to lift itself into the air. I think anybody struggling to meet 120 last year without a 20-30 point climber probably over-designed something

Pault

05-02-2014, 21:54

I meant the new rules since 2012 to 2013. Last year required robust enough systems for the robot to lift itself into the air. I think anybody struggling to meet 120 last year without a 20-30 point climber probably over-designed something

Last year it was definitely easier, but not as easy as this year. The reason this year got even easier is because the robot needs to have a lot of open space if you want to store the ball.

Besides climbers, floor pickups could also get pretty heavy. Not so much because of the pickup mechanism, but all of the work to get those frisbees to your shooter. I believe that 118 was on the edge even after they removed the climber, and they were under 30in tall.

Zebra_Fact_Man

06-02-2014, 08:46

Adding weight's never been a problem for our team. On bag day, (with the one exception being 2011) the robot has always been 110+, and generally we have to put the robot on the Subway diet during our unlock period.

This year looks to be no different, as the robot's project weight is nearing 115.

That's cool though; extra pushing help never hurt anyone.

railerobotics

06-02-2014, 10:09

Our robot is just a shade over 93 lbs as of now. The frame perimeter rules, as well as the KISS principle have led to a light robot this year. Also don't see the need to add ballast (at least in our situation). It's relieving to not have to worry about drilling holes in all our quarter inch plates this year :)

Abhishek R

06-02-2014, 10:34

I meant the new rules since 2012 to 2013. Last year required robust enough systems for the robot to lift itself into the air. I think anybody struggling to meet 120 last year without a 20-30 point climber probably over-designed something

We were right under the 120 lb (118.5 ish?) mark last year and we didn't have a 20 or 30 point climber.

Ben Martin

06-02-2014, 14:06

Practice robot, about 125
Competition robot, about 45
When we get on the field at our first competition, I expect the competition robot to be somewhere between 150 and 154 fully-loaded.

who716

06-02-2014, 14:16

So after wieghing our own robot last night. I was thinking that we could see some really lightweight bots this year.

So:

How much does your bot weigh?
Are you planning on adding weight to reach the max 120lbs?

We weighed our robot twice so far once two weeks ago, with everything that we thought was going to go on it and we were at about 89LB then we weighed it again on Saturday with everything on it and we were at 97Lb. after we took it off the scale we found out that the battery was in the robot the whole time therefore assuming the battery weighed 15 pounds we estimated the weight to be 82LB, so somewhere along the two week path we lost some weight :P after we established we have lots of weight too spare we decided to make a few more mechanism for a robot to take up some of that weight, my motto is your given the 120 pounds, you might as well keep adding helpful mechanism until your out of mechanism our weight

Answer42

06-02-2014, 14:27

How comp bot currently weighs less than 30 lbs.

typo?

AdamHeard

06-02-2014, 14:48

typo?

Yes, meant to say "Our".

Phyrxes

06-02-2014, 15:02

I know we plan to add mass to adjust the dynamics of our launch system. This is going to also be the year of how close can we get the CG to the floor!

Squillo

06-02-2014, 18:35

I agree that it would be more informative if the "91-120" range were broken down a bit. This is the first year in ages (maybe ever) that we have not been struggling to keep under 120- so far we're at about 97 lbs. "soaking wet" (no, no, not REALLY soaking wet, though it HAS been raining here for about forever... and our shop is a bit damp since it really has no walls on two sides...) To me, that is a HUGE difference, but I still have to report in the top category.

Anyway, it's really nice to not have to stress about weight every time we discover that we need to add something!

Also, really nice that we actually have a "live" robot more than 10 days before SBD. That IS a good feeling.

page2067

06-02-2014, 18:40

The other day we did weight check and came in at 98 lbs (weakling?) with some projection for components not on the robot yet.
This along with the new 45 lb. (thanks Frank) with-holding allowance told us we could try to develop another sub-system - but that is not our priority in the next week -

and I believe we would add ballast to get up to 115+ lbs.

Question for Adam (and the other <30 lb response) - 30 lbs is your current weight - is it really what you expect to bag?
That would raise definite curiosity about your game strategy...

Whippet

14-02-2014, 11:27

As of today, ~62 pounds at full inspection weight. We're trying to see what we can remove to keep out for Bag & Tag.

DampRobot

14-02-2014, 11:40

As of today, ~62 pounds at full inspection weight. We're trying to see what we can remove to keep out for Bag & Tag.

Wait... For reals?

Whippet

14-02-2014, 11:52

Wait... For reals?

Yeah, for reals. Our 191 pound mentor stood on a scale while holding the robot and the total weight came out to 153 pounds.

Edit: Just to clarify, we want to see what part of the robot to leave in the bag so the rest will be under 45 pounds. Basically, the 17 most refined pounds of the robot.

Wayne Doenges

14-02-2014, 12:10

Yeah, for reals. Our 191 pound mentor stood on a scale while holding the robot and the total weight came out to 153 pounds.

I would be investing in a new scale. 191 + 62 = 153 :D
We weighed our robot yesterday. Competition weight is 118.2 and we didn't have to remove anything to lose weight.