Horizontal Bar: Vertical Velocity

[Mike Betts]

Originally Posted by Nick R.

i dont think they would allow us to jump ONLY 1.5 feet if the bar is about 10 feet high and there is a restriction on the hight (60 inch) as usual..
i think we're going to try and go about it with a spring..

Nick,

I would imagine that this would (and should) be disqualified. The spring may be dangerous (in the view of the inspectors) if it goes off in your face...

I do not think that they want projectiles. Period.

However, they are allowing a "small" projectile that would not cause great concern to spectators, players or referees...

As a member of a team who, in 1994, made a catapult capable of launching a 7 pound ball 30-40 feet, I can testify to the incredible power which could be stored and then released by these robots.

That particular robot was a crowd pleaser but it scared the heck out of me (and the officials). The spring mechanism was made from the 10 feet of latex tubing in the kit and the bands broke under tension (a lot). Not to mention that sometimes the match would end before we fired (but the mechanism was armed) and the field team had to remove the robot and hope that it did not go off in their face.

Any engineer who can't design a "safe" thin arm to deliver a cable (attached to a winch) to the bar needs to go back to school.

Let's all stop being lawyers... When we design these systems ask " would I want my Mom (or daughter) standing next to this thing when it goes off?".

[/end soapbox]

[Wetzel]

Originally Posted by Mike Betts

Nick,
Any engineer who can't design a "safe" thin arm to deliver a cable (attached to a winch) to the bar needs to go back to school.

Let's all stop being lawyers... When we design these systems ask " would I want my Mom (or daughter) standing next to this thing when it goes off?".

FIRST dosn't need be concerned with what an engineer can or can not design safely, but what students can safely design. Teams have alot of different ways of design, from engineers and students working side by side, engineers watching and pointing things out, to no engineer support, to totaly engineer designed.

Nice play on the GP saying.

Wetzel

[animater31405]

I see this whole thing on, how are they really going to know if somethings going too fast if the object isn't going 20 ft (sarcastically) way up in the air and hitting someone in the head. I think the judges will be very lenient on this role and cut alot of slack within safety reasoning.

[lips]

Just curious, I know that the vmax=10ft/sec, but does that apply to non-projectiles aswell? for intance, if we were to use a tube-in-tube to raise a hook up to grapple the bar, but the hook was (on the first trip) attached to the hard tubing, which was in turn attached to the roboti, would it be considered a projectile? if so, we were be running it with a motor and therefore still running at a constant 10ft/sec, so it would need to take 1 sec to get up there. if not, could we raise it as fast as possible?

[animater31405]

I don't think that would be considered a projectile by any means but that's just me.

[tkwetzel]

The rule states that all mechanisms must not exceed 10 f/s. That would include any telscoping arms, projectiles, or anything else.

[ahecht]

Originally Posted by lips

Just curious, I know that the vmax=10ft/sec, but does that apply to non-projectiles aswell? for intance, if we were to use a tube-in-tube to raise a hook up to grapple the bar, but the hook was (on the first trip) attached to the hard tubing, which was in turn attached to the roboti, would it be considered a projectile? if so, we were be running it with a motor and therefore still running at a constant 10ft/sec, so it would need to take 1 sec to get up there. if not, could we raise it as fast as possible?

I hope so. I was nearly impaled in the pits at Nats by a robot with an arm that extended at atleast 10fl/sec. It can be even more dangerous than a projectile, sin