Shop OBEX P1 Docs P2 Docs Learn Events
Raytheon's 'Sum Of All Fears' robotic arm — Parallax Forums

Raytheon's 'Sum Of All Fears' robotic arm

HollyMinkowskiHollyMinkowski Posts: 1,398
edited 2009-10-28 07:59 in General Discussion
Just opened at Epcot center...now this would be a fun propeller project smile.gif
I wonder if large car starter motors could power this?
www.youtube.com/watch?v=ilpBKRwqIsE
6a00d83451c3cb69e20120a63f3ab9970c-450wi

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"Where am I? Where am I going? Why am I in a handbasket?"

Comments

  • James LongJames Long Posts: 1,181
    edited 2009-10-23 23:48
    Nope....forget it......a starter motor can not hold a single position....and servo motors big enough to do so would require a huge amount of power.

    Try Ebay...look for Fanuc.

    James L

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    James L
    Partner/Designer
    Lil Brother SMT Assembly Services

    Are you addicted to technology or Micro-controllers..... then checkout the forums at Savage Circuits. Learn to build your own Gizmos!
  • ElectricAyeElectricAye Posts: 4,561
    edited 2009-10-24 01:33
    The dome over the people's heads should be shaped to look like a T-rex and have the legs sticking out from between its teeth. tongue.gif
  • James LongJames Long Posts: 1,181
    edited 2009-10-24 01:44
    Elec......yea that would be great.

    I looked for a robotic are strong enough to swing around that much weight.....but didn't find one. I didn't search very thoroughly though.

    I'm pretty sure it is a Fanuc or one of the large brands which provided the arm. Pretty scary....because I used to work with those, and have seen when things go wrong. I saw one launch a TV about 400 ft. Not a small TV either.

    James L

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    James L
    Partner/Designer
    Lil Brother SMT Assembly Services

    Are you addicted to technology or Micro-controllers..... then checkout the forums at Savage Circuits. Learn to build your own Gizmos!
  • ercoerco Posts: 20,260
    edited 2009-10-24 01:46
    Holly, you know about STARTER MOTORS, too? You're dangerous, and so much more than 104 pounds of trouble. [noparse]:)[/noparse]

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    ·"If you build it, they will come."
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2009-10-24 02:33
    @erco

    I read about some guy using them as motors in a project.
    If I remember correctly he turned them into some sort of giant
    stepper motors. They must be strong...they can make a big
    gasoline motor spin.

    Maybe if you had a large air compressor you could move an arm that big with that?
    Don't they do that to make the stuff work on those big tracked vehicles you
    see at construction sites?

    BTW... I saw the new videos of the twins on your youtube page.
    I loved the active baby clip smile.gif
    The one with the baby snoring was precious as well.

    You should take lots of footage of you and their mother
    holding them....those will be very important to the girls
    decades in the future.

    You just can't take too many pictures.
    I have a short clip of me as a baby with my parents.
    I keep meaning to make a digital copy of it for safety
    as it is on an old tape that is like 20 years old...it may start
    to fade away. I figure if I post stuff like that on youtube
    it will become eternal as I can't imagine the vids there
    will ever be lost.

    You just have to see this video of a baby girl dancing to
    a music video!
    www.youtube.com/watch?v=ikTxfIDYx6Q

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "Where am I? Where am I going? Why am I in a handbasket?"

    Post Edited (HollyMinkowski) : 10/24/2009 2:44:08 AM GMT
  • W9GFOW9GFO Posts: 4,010
    edited 2009-10-24 06:23
    Heavy equipment uses hydraulics. The engines that power some of them are not as big as you might think. My 8,000lb mini excavator uses a 27 hp three cylinder diesel. Certainly trucks use compressed air but only for brakes, horns and sometimes suspension and less commonly, starters.

    397004254_ZfAzG-M.jpg

    Rich H

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    The Simple Servo Tester, a kit from Gadget Gangster.
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2009-10-24 07:25
    @W9GFO

    So those tubes with the rods in them are full of liquid then?
    Since liquid is not compressible like air there must be another
    cylinder and rod that has a motor pushing the rod in/out to
    squirt out the liquid and then pull the rod to suck it back in?
    Those little hoses running to the tubes must be very tough smile.gif

    That digging machine looks like it would be fun to play with.
    If you put a seat where the shovel is it would almost be like that
    new ride at Epcot! You could sell tickets and join a carnival ... LoL

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "Where am I? Where am I going? Why am I in a handbasket?"
  • W9GFOW9GFO Posts: 4,010
    edited 2009-10-24 17:34
    HollyMinkowski said...
    So those tubes with the rods in them are full of liquid then?
    Since liquid is not compressible like air there must be another
    cylinder and rod that has a motor pushing the rod in/out to
    squirt out the liquid and then pull the rod to suck it back in?
    Those little hoses running to the tubes must be very tough smile.gif

    The liquid is hydraulic oil. The tubes with rods in them are called cylinders. There is a pump attached to the motor which provides the pressure. The pressure in those hoses is about 3,000 psi.

    en.wikipedia.org/wiki/Hydraulic_machinery

    It is fun. You can search around YouTube and find some crazy things people have done with excavators.

    Redneck ride

    Dangerous fun

    Also dangerous - on a smaller scale

    Rowing?

    Excavator car wash

    Rich H

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    The Simple Servo Tester, a kit from Gadget Gangster.

    Post Edited (W9GFO) : 10/24/2009 6:21:17 PM GMT
  • icepuckicepuck Posts: 466
    edited 2009-10-24 18:48
    "German safety video" is another funny one to watch, but not so funny when having to deal with OSHA after wards.
    www.youtube.com/watch?v=Tqd4aPs5WTA
    -dan

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Arguing with myself--sometimes me, myself, and I don't always agree.
    (Former) Caterpillar product support technician
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2009-10-24 23:52
    Those are some fun videos smile.gif


    Hydraulics seems like a really excellent way to power robotics.
    But I don't see how they prevent fluid leakage and loss under such
    high pressures!?

    Has anyone ever done hydraulics with a completely closed system?
    I mean with something like expandable membranes at both ends
    instead of the cylinders and rods? Not as much linear motion but
    there would never be any fluid loss.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "Where am I? Where am I going? Why am I in a handbasket?"
  • icepuckicepuck Posts: 466
    edited 2009-10-25 00:11
    said...
    But I don't see how they prevent fluid leakage and loss under such
    high pressures!?

    I was going to try to explain it but the following link does a better job plus it has pictures...
    -dan
    en.wikipedia.org/wiki/Hydraulic_cylinders

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Arguing with myself--sometimes me, myself, and I don't always agree.
    (Former) Caterpillar product support technician

    Post Edited (icepuck) : 10/25/2009 12:18:47 AM GMT
  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2009-10-25 00:42
    Thanks icepuck! smile.gif

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    "Where am I? Where am I going? Why am I in a handbasket?"
  • W9GFOW9GFO Posts: 4,010
    edited 2009-10-25 00:53
    icepuck said...


    I was going to try to explain it but the following link does a better job plus it has pictures...
    -dan
    en.wikipedia.org/wiki/Hydraulic_cylinders

    I was too, that's why I put the exact same link in my post above... smilewinkgrin.gif

    Rich H

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    The Simple Servo Tester, a kit from Gadget Gangster.
  • SRLMSRLM Posts: 5,045
    edited 2009-10-25 02:14
    There are some hobbyists out there who use compressed air as a mechanical force. I used to be involved in model railroading in the garden, and some people preferred compressed air actuators over electric for things like switches. But as for robots, I don't think it would be too practical. You need to generate the pressure somehow, so you need a big electric motor and batteries, or some sort of internal combustion engine. It is somewhat similar to a steam engine, and those never worked out on a small, personal scale.
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2009-10-25 03:01
    Lego has (or had) air actuators: en.wikipedia.org/wiki/Lego_pneumatics. That's pretty small-scale.

    The compressibility of air is a big problem from a safety standpoint, though. In an industrial environment, if a pneumatic actuator jams, the pressure can build up until the jammed component frees itself with explosive suddenness. Hydraulics are much safer in this regard.

    My car (a 1982 Mercedes diesel) uses reverse pneumatic (i.e. vacuum) actuation for a bunch of functions, including door-, fuel- and trunk-locks, brake assist, and motor kill. If you lift up the floor mats, you will see plastic vacuum lines running all over the place. In the trunk there's a "vacuum reservoir" ('hafta laugh every time I describe it that way smile.gif ). Before I understood this system, I was having a problem with my engine not shutting off, unless the driver's side door was locked. 'Turns out, after some sleuthing with a hand-actuated vacuum pump, that there was a vacuum leak in the left rear door lock. Replacing it (about $15) fixed the engine shutoff problem.

    -Phil
  • ElectricAyeElectricAye Posts: 4,561
    edited 2009-10-25 03:53
    Phil Pilgrim (PhiPi) said...
    ....

    The compressibility of air is a big problem from a safety standpoint, though. In an industrial environment, if a pneumatic actuator jams, the pressure can build up until the jammed component frees itself with explosive suddenness. Hydraulics are much safer in this regard.

    Quite true about pneumatics, which is one reason you shouldn't try to pressurize air in PVC pipes, etc. The springiness of the air allows more energy to be stored in the system compared to a fluid like hydraulic oil or water, so when a pressurized pneumatic system lets rip, it can accelerate the pieces much faster than a liquid fluid. However, getting a leak in a high-pressure hydraulic line, if it just so happens to be the right size hole, can create a powerful jet that is easily capable of cutting off your fingers or injecting your skull with lots of oil and turning your brains into a pink and grey version of a snow globe. If you've ever used a pressure washer on a piece of wood, you know what I mean. skull.gif
  • W9GFOW9GFO Posts: 4,010
    edited 2009-10-25 05:28
    ElectricAye said...

    Quite true about pneumatics, which is one reason you shouldn't try to pressurize air in PVC pipes, etc. The springiness of the air allows more energy to be stored in the system compared to a fluid like hydraulic oil or water, so when a pressurized pneumatic system lets rip, it can accelerate the pieces much faster than a liquid fluid.

    Yeah, and PVC doesn't just break, it shatters, sending sharp jagged projectiles at you at high velocity.

    Rich H

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    The Simple Servo Tester, a kit from Gadget Gangster.
  • W9GFOW9GFO Posts: 4,010
    edited 2009-10-25 05:32
    ElectricAye said...
    The dome over the people's heads should be shaped to look like a T-rex and have the legs sticking out from between its teeth. tongue.gif

    Lay chicken wire over it, spray paint black, then remove chicken wire and it would really look like a fly.

    Rich H

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    The Simple Servo Tester, a kit from Gadget Gangster.
  • AleAle Posts: 2,363
    edited 2009-10-28 07:59
    Those kinds of games are the ones I stay away from. Thrill or any other thing like that can be easily obtained by looking at the bank bill wink.gif.

    Starter motors are not toys, they need huge currents (~100A) and produce quite a bit of torque: If not secured properly they _jump_ when powered, very dangerous.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Visit some of my articles at Propeller Wiki:
    MATH on the propeller propeller.wikispaces.com/MATH
    pPropQL: propeller.wikispaces.com/pPropQL
    pPropQL020: propeller.wikispaces.com/pPropQL020
    OMU for the pPropQL/020 propeller.wikispaces.com/OMU
Sign In or Register to comment.