pic: Simple hook delivery system

[connoc1]

This is awesome! Did it ever miss the bar in matches/practicing on a bar? If it did, did it fall back onto the robot or break the extension length rule? Thanks!

[trumpthero786]

Built at an event? That's absolutely insane. How does the clamp stay open/shut (more worried about the shut part). Do you have any close up pictures of the system, particularly the rubber bands or latex you were talking about? And then how are you winching up? Is it a PTO or separate gearbox?

I know 118 did it already, but honestly, this one is so much cooler. Amazing work.

[Roboshant]

Amazing mechanism! Especially for something done over the course of a competition! Is that a shaft collar being used to attach the fiberglass on to the hook? Also, I'm not a hundred percent sure about this but, one of our mentors said that fiberglass was not legal for use, as it shatters if it breaks and can cause splinters if not handled correctly.

[MrForbes]

heh....if fiberglass were illegal, then a whole bunch of 842's past robots would be illegal! since they had fiberglass chassis



I'm sad I don't get to see it live in action. I guess we need to win so we can go to Champs so I can see it work!

[JohnFogarty]

I'm confused. How does your hook stay open till it clamps on? I know how the 118 style one works, but this one seems fundamentally different.

[Kevin Sevcik]

Originally Posted by JohnFogarty

I'm confused. How does your hook stay open till it clamps on? I know how the 118 style one works, but this one seems fundamentally different.

Open is easy, You can look at it and tell it's an over-center mechanism. The back piece of latex tube would clearly hold it open under tension. I'm more curious about what moves the two halves far enough forward to break-over and snap shut. Is it just inertia when the middle hits the bar?

[s_forbes]

Originally Posted by Kevin Sevcik

I'm more curious about what moves the two halves far enough forward to break-over and snap shut. Is it just inertia when the middle hits the bar?

Yep!

Even if it doesn't hit a bar, the inertia of the two hooks makes them go over center when the grappler reaches the end of the rope.

[Boltman]

Very cool.

What happens when it misses does it ever have the potential to go outside 15"?

How do you aim it?

[joeojazz]

How did you use the rubber band like a crossbow if it was inside of the pneumatic cylinder. Also could you fit under the low bar with it?

[connoc1]

Originally Posted by joeojazz

How did you use the rubber band like a crossbow if it was inside of the pneumatic cylinder. Also could you fit under the low bar with it?

What I believe they did was use that red stick thing to push back an elastic band (probably surgical tubing), and then used the pneumatic cylinder to hold back the elastic band and keep it there until it was quickly released by actuating the cylinder.