Well the Robonova can actually use the 5990’s, from what i learned from hitecs site they make it for the robonova’s use. The 5498’s are also an availible option but the have significantly lower torque compared to the others. Im thinking i might just get both lynx and nova’s brackets and expierement with them.
Bioloid is without a doubt an excellent kit, and i have seen you around robosavvy with it. I would get one if the servos were of a standered issue but sadly they arent .
As for controllers- im planning on using the ssc-32 for servos, And im thinking of maybe implementing a Pico ITX the VIA makes for the master controller (if space and weight permits) or ill use a basic atom & propellor combo, have any suggestions?
That’s pretty interesting that the 5990TGs can be used with Robonova. You can have a pretty torque monster Robonova with those!
The Bioloid doesn’t use standard servos, but they are feature-rich servos. It has temperature and load sense built into each one. What really attracted me to the Bioloid’s humanoid kit was the servos, and one of their unique bracket, which attached two servos into one bracket which keeps the CG lower if you were to implement those two DOFs stacked on top of each other. The only other robots that I have seen implement this kind of bracket are the HPI/Futaba’s humanoid. The KHR-1HV and Bioloid humanoid, as well as the HPI/Futaba’s humanoid offers the hip rotate, which makes turning a bit more efficient since it can turn in place rather then sliding the two feet to turn.
As for the controller, I don’t see how you would need a PICO ITX on any of the hobby bots unless you are planning to run some very sophisticated software, such as a RTOS (real-time OS).
For me, SSC-32 + Bot Board (with Atom Pro 28) combo works fine and there are plenty of horsepower to do the work I need (which is to navigate based on Ping))) sensor and GPIRD Sensor)…
Well, the only thing im still wondering is what are some good/high speed servos with average torque that are standerd size and can fit in lynx/nova brackets?
You need to choose your servos based on the application they are going to be used in. The Lynxmotion product pages have all the information you will need to choose the servos you need for a specific use - torque information, size, speed, compatibility with the SES, etc. There are usually links to full datasheets also.
What kind of robot or other application are you going to be using the servos in? It’s impossible to help without some details, and it’s better to provide too much than too little.
The application is going to be a humanoid robot, my goal is to get the robot to walk fast but smooth, im leaning something towards what they use in robo 1 bots, anybody got any suggestions? Answers are appreciated
For this, you do not want average torque servos. You mention Robo 1, so I am guessing you are talking about a bot with at least 5 DOF per leg. Add arms to that and you are talking about digital servos for sure, at least HS-5645MG servos if not heftier ones.
Oh yes, there are several servos that exceed the HS-5645MG, but the price goes up rather quickly as you gain more torque and speed. Check out the servo section.
Oh yes, without a doubt! I wish I could afford a set of those! You will need the servo programmer if you want to get a full 180 degree of motion from them, and some other digital servos.
Yes these servos are pretty fast compared to the 5990’s and they also have a reasonably good torque. The price is quite a stretch for me, so im only going to be getting one of these every 1-2 weeks until i have enough for the legs. Well now that i have that all and decided im going to start CAD for the bot. Im also considering the dual knee joint Matt Bauer made robots-dreams.com/2007/04/jumping_robots_.html for my project. Any comments/suggestions are welcome!
I’d go with the HSR-5990TGs IMO. I believe they have an overload sensing circuit which protects it when there are too much current flowing through when driving the motor inside…
The 5955s have a reputation of blowing from what I read on another thread…
That double jointed knee is very interesting! This should be easy to do with the SES also. With the double jointed knees, one might be able to use a lower cost servo where a more expensive servo would be needed otherwise.
I suggest Alibre Design for 3D CAD. I bet nobody saw that one coming…
You will love this… I just designed a double jointed knee for the BRAT. It would actually work much better in a 5DOF leg, but it would work on a BRAT with 4DOF fairly well. A BRAT would not be able to get the major crouch without the 5th DOF though, because the knee joint would not be balanced in a 4DOF leg. The knee in on the Robonova has four servo joints in a rectangle when fully crouched - this requires at least 5DOF leg to accomplish with SES. I have actually assembled the brackets for the 4DOF leg, and it would be trivial to add another joint for the 5DOF version.
It doesn’t have a double jointed knee, but it is possible to squat with this build.
Excluding the servo for the head, it does call out 18 servos. My idea was to use 18 HSR5990TGs for it.
Also, if you want something that can squat, have you considered the biped scout? The reverse knee “chicken-walker” style is much more stable then the humanoid since the COG (center of gravity) is much more lower and concentrated underneath the “chin” of the bot…
MrMikey on these boards have constructed his own Lynx 209 in the thread “bought the wrong servo I guess”:
According to some of his reply, he bought 22 of them (which is crazy IMO considering the price of these things! )
For the scout, you only need 12 servos for a 6DOF leg. Of course, it’s only 12 servos since there are not arms, but one can easily attach something on the sides for a Mechwarrior-style robot…
I built up the brackets for the SES leg with the double jointed knee. I ran out of short 'C" brackets though. I could shorten the leg a bit by using all ASB-09’s. At some point, my BRAT is going to get double jointed knees.
The scout looks interesting but im set on a humanoid right now because i just am more willing to do that.
The dual knee joint to me also sounds like a good idea since it reduces the strain on the servos and can make the bot much quicker/flexible.
Now, im working on placing servos in the leg so i can make it strong but fast… Ill need help on this so im planning on using the 5955 and the 5990’s for the legs (if this is possible). The leg is going to be the same type as the robonova except for the dual joint knee. If theres any way somebody can plan this out for me to incorperate speed with strength it would be greatly appreciated!
P.S. Hey linuxguy, thanks for the alibre link, im learning it as i type! EDIT: also, i like what your planning with the BRAT, it looks as though your really pushing it to its potential, nice work!
Steer clear from the 5955’s. I’ve read in these, and other forums, that they can burn up easy. The 5990’s are the same price, and have protection against burning up.
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