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 the hardest task this year is the same as every other year: getting the engineers out of the crate so you can close it up and the FedEx guy can haul it away! - KenWittlief [more] |
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Another view of our first prototype robot, again, I know it's messy, it was around 1AM at the time, and neatness was not a priority.
The robot is fully functional and hurdles like a dream. After the ball has been gripped, a pickup and hurdle cycle takes 1.25 seconds, and the robot can go as slow as 0.8ft/sec and still make a hurdle. The standard auto-hurdle speed (triggered by joystick during teleoperated) is 8ft/sec, and works like a charm.
All heavy objects in the robot (battery, compressor, arm transmission) are located on the left side of the robot as low as possible, and all superstructure components are as light as possible (yet amazingly strong thanks to our new pipe bender we got this summer!). The robot can tip to 50degrees before it's center of gravity travels outside of the robot's footprint. Also, sufficient traction is generated by the left side of the robot to drive while takeing a four foot radius turn at 10ft/sec.
And... the super awesome special feature's mounting locations can (maybe, might not be good enough picture) be seen on the right side of the robot (side facing left in the picture)....
Discussion
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10-02-2008 14:47
Joe G.
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
Looks very nice. Am I correct that the two pincers grab the ball, rotate it up to the top, where it is launched? How high off the ground is it tossed?
How well do the claws hold on to the ball? It looks like you have very little surface area, and therefore making it so that the ball must be very precisely positioned, but if it works, it works.
And what might the unmounted "super awesome special feature" be?
10-02-2008 16:07
Qbranch
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
You are correct! The ball is grabbed, picked up, released (the ball rests pretty securely between the top two pipe pieces, the hockey puck (whose curve matches that of the ball) and the open arms keep it from rolling away), then six 3/4" bore 10" stroke pistons hurdle the ball. Seperate solenoids are used to shoot and retract the pistons, to allow the topsides of the pistons to be vented before the bottom side tries to push (no effort wasted pushing pressurized air out of the way).
After the ball goes out of contact with the pistons, it travels up another two and a half feet due to its momentum for a total hurdle height of about three feet. The ball starts out being about four feet off the ground, so the bottom of the ball goes to about 7 feet 4 inches off the ground to clear the overpass.
Hopefully I'll be posting video footage later this week of the robot hurlding as well as running in autonomous.
-q
**EDIT** Forgot to mention the super awesome special feature. The super awesome special feature is a homebrew nine inch tall by 27" long four character segmented LED display, 3,000mcd red LEDs. It may be shortened to three characters as finding mounting locations while still being able to list sponsors has been... eh... how shall I say... problematic. At any rate, photos (maybe video) of that running to come as well. (As it sits now, it functions, but is a big PCboard with lots of wires hanging out all over. Figuring how to ruggedize it now.)
10-02-2008 16:10
dtengineering
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
Very cool! I'm looking forward to the video.
Jason
10-02-2008 16:32
ALIBI
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
Looks great. I have one question and am hoping that you simply have a typo.
Do you really have "six 3/4" bore 11" stroke pistons"?
3/4" bore cylinders are only allowed up to 10"
10-02-2008 17:01
AdmiralAllen
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
fully extended that thing is within 80 inches?
from very back of robot to front of arm?
10-02-2008 18:52
Qbranch
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
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Originally Posted by AdmiralAllen
fully extended that thing is within 80 inches?
from very back of robot to front of arm? |
If you're wondering why this length was on there, in order to make the final bend on the arm pipes, you need a tail for the bender to grab on to.
-q
10-02-2008 19:48
AdmiralAllen
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
what'd you use for a bender?
11-02-2008 21:51
Qbranch
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
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Originally Posted by AdmiralAllen
what'd you use for a bender?
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-q
12-02-2008 00:18
AdmiralAllen
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
lol...... we used a steel railing and a football player.....haha
12-02-2008 11:35
Southgate Servo
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
Looks like a good bot look forward to video
12-02-2008 21:33
Protronie
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
Nice work... can't wait to see it in action!
13-02-2008 00:44
AdmiralAllen
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
what kinda psi does that take?
13-02-2008 08:16
Qbranch
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
The usual 120psi in the two storage tanks, the usual 60psi in the working area of the pneumatic system (and the two 60psi accumulator tanks)...
-q
13-02-2008 08:27
D_Price
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
Nice protoype but it looks like it needs to be cleaned up!
14-02-2008 01:02
AdmiralAllen
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
you regulate the accumulator tanks?
personally i'd put the accumulator tanks before the regulators to get a greater quantity of air in the system
14-02-2008 07:48
Qbranch
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
Regulators don't deal too well with shock-loads on the pneumatic system (low flow). I realize it has less air capcity, but what we have is what we need to handle shock loads on certain parts of the pneumatic system.
-q
15-02-2008 16:56
AdmiralAllen
Re: pic: First Fully Functioning 1024 2008 Machine - Isometric View
i'm guessing that massive launcher thing is your idea of a shock load?
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