.:`=-~rANdOm~`-=:. Game Servers
.:`=-~rANdOm~`-=:. Game Servers (Read Only) => Discussion => Topic started by: Jhon on January 21, 2014, 12:10:18 AM
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Racing mecha, 'nuff said.
(http://images.indiegogo.com/file_attachments/168064/files/20131101001633-1-Prosthesis-Title.jpg?1383290193) (http://www.indiegogo.com/projects/prosthesis-the-anti-robot)
Would be so frikkin awesome to go to a race of these robots.......I want one D=
There's also this, much more expensive, mecha: http://kuratasrobot.com/ (http://kuratasrobot.com/)
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Looks too heavy, too slow, underpowered, and over engineered.
Why are they making it out of steel, that is ridiculous aluminum would work just fine and make it 1/3 the weight. I also don't see any real way of adding much power to the robot, it looks like it might top out at 5-10 mph tops. It also looks like it is going to beat the hell out of you when you ride it. That walking motion is not going to be smooth.
I think races between those really only have novelty in the fact in that they are walking. Otherwise not too exciting to watch those behemoths amble around.
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Looks too heavy, too slow, underpowered, and over engineered.
Why are they making it out of steel, that is ridiculous aluminum would work just fine and make it 1/3 the weight. I also don't see any real way of adding much power to the robot, it looks like it might top out at 5-10 mph tops. It also looks like it is going to beat the hell out of you when you ride it. That walking motion is not going to be smooth.
I think races between those really only have novelty in the fact in that they are walking. Otherwise not too exciting to watch those behemoths amble around.
Our oh Great Lord has spoken!
My gad Xwain you smaat
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I think this robot machine is more properly built for a demolition derby, or a off-road course. If you want it to be built for a race, its best to scrap the robot and start over.
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Looks too heavy, too slow, underpowered, and over engineered.
Why are they making it out of steel, that is ridiculous aluminum would work just fine and make it 1/3 the weight. I also don't see any real way of adding much power to the robot, it looks like it might top out at 5-10 mph tops. It also looks like it is going to beat the hell out of you when you ride it. That walking motion is not going to be smooth.
I think races between those really only have novelty in the fact in that they are walking. Otherwise not too exciting to watch those behemoths amble around.
I'm not sure why they aren't using aluminum, but my guess is - Safety. This article might be appropriate - http://www.cineventions.com/steel_aluminum.html (http://www.cineventions.com/steel_aluminum.html)
One of their stretch goals is to use carbon fibre and titanium.
I've seen in one of his videos that the robot is planned to reach about 30 kph (18.6 mph). You could always ask him......If you're interested.
I think this robot machine is more properly built for a demolition derby, or a off-road course. If you want it to be built for a race, its best to scrap the robot and start over.
He did mention in one of his videos something like, the pilot will need to get used to controlling it on different terrains, so off-road course might be the plan. It's still a race though (just...Off-road lol).
I'm hoping this project will cause other people to build their own "racing mechas" which will be better than this one. If this one succeeds, the chances of someone else trying to do it will rise. "This is only the beginning."
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I'm not sure why they aren't using aluminum, but my guess is - Safety. This article might be appropriate - http://www.cineventions.com/steel_aluminum.html (http://www.cineventions.com/steel_aluminum.html)
One of their stretch goals is to use carbon fibre and titanium.
I've seen in one of his videos that the robot is planned to reach about 30 kph (18.6 mph). You could always ask him......If you're interested.
That link actually isn't very applicable. It speaks only to a specific usage (camera jigs) which require a very high level of stiffness. This is because its a long boom with a camera at the end, so if it jiggles every time you move it, your footage would be pretty useless. Everything has an appropriate application.
This case however, the weight they were quoting was 3500kg or nearly 8000 lbs. That is crazy heavy for something that you are going to use as a racing vehicle. You might as well just race around D4 Caterpillar dozers. It speaks to me that they haven't really put much engineering design thought into optimizing for weight and speed. Its a fracking racing mech. The only things you care about is low weight and maximizing speed.
I would envision a racing robot as adding akin to adding a saddle to the Boston dynamics cheetah. Now that would be some interesting racing. :D
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That link actually isn't very applicable. It speaks only to a specific usage (camera jigs) which require a very high level of stiffness. This is because its a long boom with a camera at the end, so if it jiggles every time you move it, your footage would be pretty useless. Everything has an appropriate application.
This case however, the weight they were quoting was 3500kg or nearly 8000 lbs. That is crazy heavy for something that you are going to use as a racing vehicle. You might as well just race around D4 Caterpillar dozers. It speaks to me that they haven't really put much engineering design thought into optimizing for weight and speed. Its a fracking racing mech. The only things you care about is low weight and maximizing speed.
I would envision a racing robot as adding akin to adding a saddle to the Boston dynamics cheetah. Now that would be some interesting racing. :D
Yeah, I wonder if they have a good reason for that.....So I asked him =P We'll see if they really haven't put enough thought into it.
LOL, riding that Cheetah would be awesome, although from how it looks now, it would fucking hurt your balls xD
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....
I completely forgot about this topic.
Albeit late, I'll post his answer anyway:
"...First of all, aluminum and carbon-fiber are used extensively in the interface and power plant.
For the legs and chassis The Alpha Leg is made of mild steel and the final machine will be Chromoly. There are two main reasons I've chosen steel.
1) Fatigue. Aluminum has no lower fatigue limit. This means that parts made of aluminum *will* break, it's just a matter of when. Yes, you can push that out to "100 years" but weight savings will diminish.
2) Repairability and ability to modify. Aluminum needs to be heat treated after welding to reach max strength. This is an expensive process that requires putting the part in an oven for, literally, days. This makes in-field repairs or mods impossible (or extremely risky)
Of course, if I had a million bucks, I'd make the whole thing off titanium."
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I completely forgot about this topic.
Albeit late, I'll post his answer anyway:
"...First of all, aluminum and carbon-fiber are used extensively in the interface and power plant.
For the legs and chassis The Alpha Leg is made of mild steel and the final machine will be Chromoly. There are two main reasons I've chosen steel.
1) Fatigue. Aluminum has no lower fatigue limit. This means that parts made of aluminum *will* break, it's just a matter of when. Yes, you can push that out to "100 years" but weight savings will diminish.
2) Repairability and ability to modify. Aluminum needs to be heat treated after welding to reach max strength. This is an expensive process that requires putting the part in an oven for, literally, days. This makes in-field repairs or mods impossible (or extremely risky)
Of course, if I had a million bucks, I'd make the whole thing off titanium."
1) I'm not quite sure what the issue is here, yes aluminum is more susceptible than steel to repeated stress fracturing. But how long are you expecting this robot to walk for 100,000 miles? I thought it was a racing robot, the thing should just barely be holding itself together by its bootstraps. On a more serious note lowering the mass lowers all of the forces involved in that walking motion. This is what engineering is about, applying steel where the forces involved necessitate it and using aluminum where you can.
One of my preferred methods of construction is carbon fiber coated aluminum. You use thinner aluminum tube and layup carbon fiber over the assembled structure. The aluminum dampens out oscillations keeping it from wiggling so bad, while the carbon fiber adds gobs of strength.
2) Yes to maximize the strength of aluminum, annealing is a good idea. But I don't really think they are that close to the safety margins that welding without heat treatment will compromise the integrity of the vehicle. Granted, Over time the vehicle will need to be overhauled to replace things that are getting dodgy. But saying you have to heat treat every time you weld aluminum in this realm of application is not true in the slightest.
But welding isn't the only way to assemble aluminum. Make the root fixtures out of steel, then thread the inside of the steel tubing, and each end of the aluminum tube; coarse class 2 threads would be the way to go to make it come together easy. Hard anodize the threads if you are going to take them apart frequently, and add some thread locker, and now you have a screw together robot, that if you break a tube you can swap it out in a few minutes and you still can weld the steel together. Everyone wins!
It will take a bit more to get everything fabricated since each thread takes about 20 minutes of lathe time, annodization sounds expensive but you can do it in a plastic bucket in your shop if you are determined. But you should be able to shave off quite a bit of mass overall, and increase repairability.
I would encourage them to look around more more innovative construction methods than triangle frame tubular construction. There are a million ways to assemble that bot, and many of them involve a lot less weight.
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What they say about the fairbanks engineering program must be true, lol. Spoken like a real engineer there.
Now, let's put these ideas into making contraptions to explore under the ice of europa or something interesting like that...
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1) I'm not quite sure what the issue is here, yes aluminum is more susceptible than steel to repeated stress fracturing. But how long are you expecting this robot to walk for 100,000 miles? I thought it was a racing robot, the thing should just barely be holding itself together by its bootstraps. On a more serious note lowering the mass lowers all of the forces involved in that walking motion. This is what engineering is about, applying steel where the forces involved necessitate it and using aluminum where you can.
One of my preferred methods of construction is carbon fiber coated aluminum. You use thinner aluminum tube and layup carbon fiber over the assembled structure. The aluminum dampens out oscillations keeping it from wiggling so bad, while the carbon fiber adds gobs of strength.
2) Yes to maximize the strength of aluminum, annealing is a good idea. But I don't really think they are that close to the safety margins that welding without heat treatment will compromise the integrity of the vehicle. Granted, Over time the vehicle will need to be overhauled to replace things that are getting dodgy. But saying you have to heat treat every time you weld aluminum in this realm of application is not true in the slightest.
But welding isn't the only way to assemble aluminum. Make the root fixtures out of steel, then thread the inside of the steel tubing, and each end of the aluminum tube; coarse class 2 threads would be the way to go to make it come together easy. Hard anodize the threads if you are going to take them apart frequently, and add some thread locker, and now you have a screw together robot, that if you break a tube you can swap it out in a few minutes and you still can weld the steel together. Everyone wins!
It will take a bit more to get everything fabricated since each thread takes about 20 minutes of lathe time, annodization sounds expensive but you can do it in a plastic bucket in your shop if you are determined. But you should be able to shave off quite a bit of mass overall, and increase repairability.
I would encourage them to look around more more innovative construction methods than triangle frame tubular construction. There are a million ways to assemble that bot, and many of them involve a lot less weight.
Wow, I'd like to see what he has to say about this. Would you mind if I send this to him?
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lol if it can only go in a straight line