I am thinking about using the micro servos (hs-85bb / hs-85mg) to save a little bit of weight and make a smaller robot but do they have enough power to move a biped with 12 servos? Also, what are the advantages over the other? Ball bearings or metal gears?
Also, are there any bearings for these:
–> lynxmotion.com/p-151-injecti … micro.aspx
Or do they ^^ just go directly to aluminum brackets?
The 85’s will not be strong enough to make a biped. Add arms to a BRAT, sure, Add a pan and tilt to a hexapod, sure, but no way on the full biped.
There are no bearings for the micro servo hinges. They were designed for a completely different purpose. We are only selling them for the DIY’ers out there. They are not SES compatible,
I am a DIY’er. 
Are you sure they will not work because they almost have the same torque as the hs-422 which come in brats and they are twice as light. My robot will be made from aluminum and carbon fiber which is super light also.
The BRAT has 6 servos… I’m quoting you just a few posts up…
You can’t make a humanoid (10-12 servo) biped from 422’s, or 85’s. Am I sure? I’ve been doing this for 16 years… I think so.
OK thanks for the info…
Are there any micro servos that will work in a 10 servo biped?
These guys must use some type of micro servo and they must be pretty powerful right? Where can I get a micro servo this fast and powerful?
youtube.com/watch?v=lsJA-TunIm4
Although the video is of a “lightweight” Robo-one class, I don’t think it necessarily means they are using micro servos. These bots are using very powerful digital servos. The HS-85 is an analog servo.
Wow those are expensive servos. 
Just wondering, but has anyone used the i00600 or the i00800 servos in a bot yet?
Also, would the hs-5485 servos be powerful enough for a 12 servo biped?
Maybe try searching for a robot like you want to build and see what servos it is using.
Listen to this man, he knows what he’s talking about.
There is no free lunch with a 10-12 servo biped. HS-5645 would be the minimum I would recommend for anything like this, if you’re crafty and vigilant about keeping weight minimized, you might get away with using 645MGs.
@ OP:
Just because something is made of aluminum or even carbon fiber (a nightmare to work with, people tend to talk about using it without realizing just how much of a mess this stuff is), doesn’t mean it’s lightweight. Aluminum adds up quick when it comes to standard servos.
I’d highly recommend starting off with a BRAT so that you can learn the basics of programming and walking gaits. BUILDING a 10-12 servo biped is one thing, programming it to actually walk is a different thing entirely. Crawl before you attempt to fly, etc.
Id listen to both these guys.
Even the 645’s might cripple. i built a 6dof per leg biped with these: never got it walking due to the servos. (even with tention springs!)
http://i531.photobucket.com/albums/dd355/innerbreed/100_2666.jpg
even tried 5dof!
http://i531.photobucket.com/albums/dd355/innerbreed/100_1972.jpg
I’ve cut carbon fiber before so don’t worry. 
I think I am going to try something a little more simple but mainly because of the cost of servos.
Hi,
I would like to build a Brat with a Torso and Arms. I see build instructions for the Humanoid biped and was wondering if these parts would be the right ones to order - I was told to ask here in the forum for such advice.
My list:
1 x Brat (no electronics) upgraded to 645 Servos kit
1 x Torso (BT-01) kit
1 x Accelerometer (DE-11)
1 x Sensor Housing (MPSH-01)
1 x Sensor panning kit (BSP-BLK)
2 x Robot Hand B (RH-02)
1 x ARC 32
-Should I order the 6V battery ? Or get a LiPO equivalent (and what would that be?) ?
-Any extra hardware needed ? like the nylon rivets etc ?
All help is appreciated.
Thanks
A 6vdc battery is easy. You just connect it directly. If you use 7.4vdc you will need to purchase a regulator capable of delivering 6vdc at 10 or more amps.
Thanks Jim for the battery advice. What about a LiPO instead of NiMH ? Any options?
More important - I need advice on the list - is that complete and do I need anything else ?
Regards
Gopal
6vdc = NiMH
7.4vdc = LiPo
I’m sorry but I just do not know if your list is complete.
My question is - is that list a good enough one to build a brat humanoid ? I know there could be infinite variations of everything BUT is that list a good starter ?
There are references to projects on the Lynxmotion site AND in the latest Servo magazine also in the advertisement but guidance seems to be sparse.
I would like to order what is there on that list and I hope I don’t have to keep ordering bits and pieces like nylon rivets etc later.
Thanks
Those are all just for example and inspiration.
My list:
1 x Brat (no electronics) upgraded to 645 Servos kit
1 x Torso (BT-01) kit<------------it might be useful to get the ASB-06 to attach the torso to the BRAT.
1 x Accelerometer (DE-11)<------------this sensor does not include cables. 2 x SEA-01
1 x Sensor Housing (MPSH-01)<------------this could be used to hold a sensor on the head.
1 x Sensor panning kit (BSP-BLK)<------------this has no use as the torso has the pan servo.
2 x Robot Hand B (RH-02)<------------fine but it would be 2 axis arms.
1 x ARC 32<------------fine but code examples will need to be modified.
Now please understand if you buy these things I can not guarantee it will include everything you need.