if the hsr-5645 puts out 168 max torque which is the so called “minimum” here, how come the robonova-1 only requires 103 oz/in?
i dont understand, the hsr-5645 is freakin awesome, its cheaper than the robonoba’s servos and not only digital, metal geared (unlike RN1s karbonite)…but most importantly, stronger than it too.
i dont get why these werent installed into robonova, maybe its cause of the custom servo design that the RN1s servos are more expensive. however, it works off karbonite gears and 103 oz/in, whats up with that?
the new purple robot advertised on robot magazine only asks for 55.55 oz/in, and thats operated at 6v too!
If I am not mistaken here the RN appears to be a little smaller than the SES bipeds. There may also be some small weight advantage in having all custom made brackets vs. a more open and robust design like the SES.
As for the materials used (karbonite) it could be a manufacturing staratagy to keep cost down. I would imagine 1000 metal machined gears would cost more to produce than molded Karbonite. I’m not sure if karbonite is machined or not, or if it’s a precission mold. In any case, the manufacture of the RN1s are to make as many at the lowest cost.
right, the RN1 looks just as tall as the tallest robots, if not its off by not too much from a look at that image. Yet it runs on 103oz/in while the others at 168?
The Scout doesn’t have an upper body, and it’s just as tall. Pete might not be much taller, but it has 6 more DOF, which makes it quite a bit heavier.
I’ve seen the RN1 “run”, and it’s not that impressive. It’s a painfully slow and weak humanoid IMHO. But it’s your money… some things you just need to figure out for yourself.
All of the really impressive humanoids I’ve seen (see posts from Hivemind, noDNA, etc) use high torque servos that are much stronger even than the 5645 you are considering. Those servos are really expensive though. 8)
The solution to the mystery here is the robonova is made from really light weight brackets. Drop one from a few inches off the table and see how many brackets need replacing. The SES brackets are made from material 50% thicker and are much stronger. The SES brackets also have ball bearings in the pivot point that the robonova does not. Biped Pete is about 1" taller than robonova, but the angle of the image doesn’t show this too well. Another thing to consider is Biped Pete is a conservative assembly. You can easily change the orientation of the knee servo to increase the height. Biped Nick (has waist rotate) is taller still.
btw, if u look at the differenece between bracket size, Biped Pete has much more space inbetween each joint, thus more leverage is put on each joint, while the RN is more specific with its parts (as said earlier) so they can be more precise and inlign with the servos
It’s a painfully slow and weak humanoid IMHO. But it’s your money… some things you just need to figure out for yourself. 
