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Thread: RX-28 PLM Humanoid

  1. #11
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    Re: RX-24F PLM Humanoid

    All I can see left is increasing the rigidity of the foot, shin & thigh parts, to reduce the wall thickness, then drill out bits of the brackets on the horns & connecting the servos to the rest. Not gonna lose much though, apart from the feet - Could prob lose 1/2 the metal there - a bit more if you can shrink the feet sideways & still keep stable.

  2. #12
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    Re: RX-24F PLM Humanoid

    just curious, how much of a weight difference is there between the ax-18 and the rx-24? Could you replace the last two servos in the arms with ax-18s and use the new board that is coming out?

  3. #13
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    Re: RX-24F PLM Humanoid

    never mind that would only save about 24g and probably isn't worth the trade off in speed. The new brackets that trossen carries would allow you to connect the rx-24 to the ax-18 without any problem right?

  4. #14
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    Re: RX-24F PLM Humanoid

    Just to make things more complicated, how about only one central servo as a shoulder rotator, driving a tiny diff so the shafts going to each shoulder turn opp ways? More chance of mechanical failure, but it should be lighter....& from memory most fighters rotate the arms opp most of the time for balance anyway.

  5. #15
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    Re: RX-24F PLM Humanoid

    So you said the trigger had to be pulled by today for your design. What did you end up going with? Did you make it under weight with the reduced cables and screws?

  6. #16
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    Re: RX-24F PLM Humanoid

    I'm going with the last design I posted, using removal of the torso-twist servo as my fallback if I can't get it under weight.

  7. #17
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    Re: RX-24F PLM Humanoid

    Your first design might still work out. Go from .063 to .05 material. It will save you ~20.5% in weight.
    With the box construction of the legs the difference in material should'nt matter that much.

    How are you figuring out the weight? Inventor does this?



    How much does the estimated aluminum portion of the bot weigh?
    Last edited by Quantum; 09-29-2010 at 05:06 PM.

  8. #18
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    Re: RX-24F PLM Humanoid

    You can create material styles and input density, Inventor can then calculate how much the total weight, volume, surface area, etc of the metal used. The legs are pretty high stress, which is why I wanted to hold off on going thinner aluminum.

    I actually kind of like the 3rd design over the 1st. It's very minimalist and industrial looking.

    The weight of the frame is about 376g currently.

  9. #19
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    Re: RX-24F PLM Humanoid

    Well, there goes our stealth advantage. Didn't know about this thread. Now we are going to show up with 25 copies there. Good job Andrew. I'm going to put a parent control blocker on your internet access...

  10. #20
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    Re: RX-24F PLM Humanoid

    Looks like I need to get a copy of Inventor for myself!





    http://mike-ibioloid.blogspot.com/

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