Who is hanging and how?

[BradMello]

Something along the lines of this

[Steven Sigley]

Carbon fiber grappling hook + carbon fiber telescoping arm.

[RRLedford]

Lifting is best solved by a TENSION solution. Ramps are compression based.
Compression is high mass and produces TORQUE.
Tension is self aligning and LOW MASS.
Think cables and synthetic fiber lines.
-Dick Ledford 3135 Robbotic Colonels

[waialua359]

Originally Posted by IndySam

but how do you fit a 30 degree ramp in a 84 in circle?

A combination of pneumatics and a ramp deploying mechanism.
Technically 27.xx degrees.

[RRLedford]

Originally Posted by Steven Sigley

Carbon fiber grappling hook + carbon fiber telescoping arm.

Does your bot traverse the tunnel? Why the telescoping scheme, when getting from the 60" max. vert. bot size limit to the 84" bar requires only a 24"+hook size swing arm. Seems harder to do telescoping?
-Dick Ledford

[Steven Sigley]

No we only cross the bump. We want to keep the arm low and close to the robot to help keep a low CG.

Telescoping should be easy how we do it. Connecting the bottom of the upper(inner) tube to the top of the bottom(outer) tube with surgical tubing. We'll use a worm transmission to hold the upper tube down inside the bottom tube against the tension, unwind the worm to release tension, allowing the arm to spring up, then after hooking, re-wind the worm to lift our robot up.

[IndySam]

Originally Posted by waialua359

A combination of pneumatics and a ramp deploying mechanism.
Technically 27.xx degrees.

To lift a robot onto your robot that is on the platform?

[Salbert]

Originally Posted by waialua359

Bruceb,
I agree on the hanging by yourself part.
Its only 2 points.
I suspect that the superior robot is one that can hang and "lift" or "carry" another robot for the 5 pointers.
The lack of rampbots discussed in CD is surprising to me for possible 4 pointers. If robots are being built to climb 45 degree angles, isnt it very possible to climb a 30 degree one?

How are rampbots 4 pointers?

[GaryVoshol]

Originally Posted by Salbert

How are rampbots 4 pointers?

If the other two bots climb your rampbot to become ELEVATED, they get 2 points each.

[Nickel5]

Originally Posted by waialua359

Bruceb,
I agree on the hanging by yourself part.
Its only 2 points.
I suspect that the superior robot is one that can hang and "lift" or "carry" another robot for the 5 pointers.
The lack of rampbots discussed in CD is surprising to me for possible 4 pointers. If robots are being built to climb 45 degree angles, isnt it very possible to climb a 30 degree one?

Good luck achieving any rampbot. From the near part of the tower (from the driver's station) to the far part, the distance is less than the length of the robot. While the wheels won't be on the edge of the bot, it is still a very small room for the robot to fit on, and any error could be catostrophic. Plus, if one robot getting 2 points is questionable, then 2 robots getting 2 points should be out of the question. It is almost impossilbe for 2 robots to fit on the platform side by side, and in any eleimination round at least 1 of your alliance partners should be able to hang by themselves.

The only way I could see a ramp bot being worthwhile would be if the ramp bot could hang from the elevated bot, but this would most likely just result from the elevated bot being pulled down and landing on the rampbot.

My team is going with a telescoping rod with a grappling hook on the end. The hook detaches and the bot is winched up. Incase that somehow fails, we have a side hanger being made too as a back-up.

[Chris is me]

Originally Posted by Nickel5

Good luck achieving any rampbot. From the near part of the tower (from the driver's station) to the far part, the distance is less than the length of the robot. While the wheels won't be on the edge of the bot, it is still a very small room for the robot to fit on, and any error could be catostrophic. Plus, if one robot getting 2 points is questionable, then 2 robots getting 2 points should be out of the question. It is almost impossilbe for 2 robots to fit on the platform side by side, and in any eleimination round at least 1 of your alliance partners should be able to hang by themselves.

Never say never. As long as the whole robot is above the plane of the platform it is ELEVATED. The ramp's "top" could be longer than the platform in theory.

[Vikesrock]

Originally Posted by Chris is me

As long as the whole robot is above the plane of the platform it is ELEVATED.

And the robot is touching the tower. It may be tricky(but not impossible) to get the second robot you are trying to elevate in contact with the tower if the first robot doesn't quite fit and has to hang off.

[bobl]

Team 58 - The Riot Crew will be hanging. In fact we tested our robot tonight. Video can be seen on youtube

http://www.youtube.com/watch?v=9TToKIpXpVI

We hope to make it a little faster but it works.

[Doug G]

Originally Posted by Steven Sigley

Carbon fiber grappling hook + carbon fiber telescoping arm.

Tested the hooks the hooks tonight, nice and light weight...

[daltore]

If our team ever gets off our little #25 chain tangent, we'll finally get back to making our lifting arm work with 3840-pound breaking strength Dyneema. We snapped our 1050-pound Spectra A spearfishing line, so our mentor has typecast the material as being weak, and he's trying to get it to work with #25 chain. But once we get back onto the Dyneema (since the chain failed tonight, even faster than the Spectra), we'll be set up to support two robots and ourselves.