I haven’t even gotten my BRAT to take a full step yet with the standard legs.
8-Dale
Oh, well if the 5955’s dont work whats a better one thats around the same speed/torque?
HSR 5990TGs
They are identical in specs as far as I can tell…
HS-5955TG (333 oz. in.) Digital Standard Servo
Description -
Size = Standard
Servo Erector Set = Yes
Range = 140° (180° capable after programming with DSP-01)
Voltage = 4.8 - 6.0vdc
Torque = 333 oz.-in.
Weight = 2.18 oz.
Speed = 0.15s / 60 degrees
HSR-5990TG (417 oz. in.) Digital Standard Servo
Description -
Size = Standard
Servo Erector Set = Yes
Range = 180°
Voltage = 6.0 - 7.4vdc
Torque at 6.0vdc = 333 oz.-in.
Torque at 7.4vdc = 417 oz.-in.
Weight = 2.39 oz.
Speed = 0.17s / 60 degrees
A 20msec difference over 60 degrees of motion for a hobby robot isn’t quite noticeable IMO.
I guess your right, Is there anything that surpasses the 5990’s in speed? Thanks for the suggestions, there really helping me.
At this torque and in this package (“standard” servo size), no. Not that I have come across.
There are many other servos that are faster then the 5990, but they can’t match its torque in this package.
Compare the rating against Kondo servos and Dynamixels by Robotis. The Kondos and Dynamixels are in a category of its own since the application of it (brackets) are different then what LM offers.
I’d save up for some 5990TGs, they are truly the best servo for its size and no servo that has similar specs, such as ones from KO Propo, Futaba, etc, can beat its price…
Just out of curiosity, would i be possible to reduce the chance ofthe 5955’s blowin up’ with possibly a fan or some sort of cooling system?
I suppose you can add some fast-acting fuses in series to the power wire (usually red), to make the fuse blow and open circuit if it exceeded a certain amount of current flow, but would you want to do that for 18 servos? If it’s yes, then you can definitely just fuse it across with the appropriate fuse.
At what current? Not sure, should probably ask around or start a new thread in the servo section asking about maximum current it should draw at say 6.0V. Then size up your fuse accordingly (hopefully slightly lower then the max so it will never reach there).
Fusing 18 servos for a humanoid seems like a big hassle to me, but that’s just me…
Yeah i guess that is a bit of a hassle but i did some research at servo city, and found the following servos:
servocity.com/html/hsr-5995tg_ultra_torque.html
servocity.com/html/hs-5997tg.html
servocity.com/html/hs-6985hb_hi-torq__coreless.html
Got any suggestions/opinions on these? There out for a reasonably good price to i assume.
5995s were designed for robo-one competition originally I believe, so they weren’t designed to be operated for a long period of time. Servocity seems like a great place for information, but they seem a little pricey.
www3.towerhobbies.com/cgi-bin/wt … LXRRC5&P=7
5990TGs (which are superior to the 5995s IMO). If you go to the main page of tower hobbies, you can add the “Save $25 on purchases over $199” so essentially, every TWO you buy, you save $25 (of course you’ll have to have multiple orders since this offer is only good PER order, not on PER quantity or the total amount, ex. you don’t get $50 off for $400 purchases)…
Hey Tom,
Sounds pretty good, i didnt know the 5990 can do 7.4V… thats a nice bonus for .14 sec/60 deg, is applying that kind of voltage good for the servo or bad (it does increase perfomance drammatically from what i see). From what i see, these 5990’s are really starting to impress me, now should i use these on the whole leg or use them on certain parts and lets another (fill in here) take another position?
BTW I LOVE THE SITE NICE DEALS! TY!
I’d use it all over since you don’t want the achille’s heel to be on any one portion of the robot. If the humanoid is doing pushups, you’d need a strong servo. My point is, if you want it to ultimately do some crazy acrobatics, you’d want strong servos in all the areas, so I would use it in all the areas EXCEPT the head. I can’t imagine the head needing to support anything but an IR or a PING))) sensor, perhaps even a small CMOS camera…
In short, I’d use 5990s in all 18 of the servos for an 19-servo humanoid, where the 19th servo is just the head (I’d use a weak servo for the head, such as a 475 or even the 1422. Personally, i don’t plan on doing summersaults so a weak servo is what I would use for the head.
You are welcome with the link. I’ve shopped at tower hobbies for nearly 20 years now. Sometimes they have good prices, sometimes they don’t. Gotta shop around especially for goods at prices at these scales.
Servo brackets, I’ve shopped around as well. LM has the BEST quality servo brackets for the standard servo size. No one else that I’ve seen anodize them and fit and finish at a tight tolerance and sells them this cheap then LM…
I guess your right, the only thing that bothers me about the 5990s is the whining sound it makes… is there any pay to reduce that 
anyway, to the main question- do you reccomend me using 6 volts for the servo’s or the 7.4 volts?
If I were you, I’d use it at close to 6.0V then the rated 7.2V since that is the max, and I’m not really a gambler to use it at the max 
It’d last longer too since power dissipation for prolonged period is the criteria for a burned out servos.
I don’t know what you mean by a loud whining noise. All servos make those noise when trying to hold position…
Well its a rumor that ive heard the 5990’s make a quite loud noise compared to what i hear with other servos. Ex: youtube.com/watch?v=tHci0Zib-dc He juiced his bot with all 5990’s and it looks pretty good. And as for the head… i plan on making it a lcd screen that shows expression, the camera and sensors will be mounted on various parts of the body. Im considering this one fo that purpose: robosavvy.com/store/product_info.php/products_id/390?osCsid=d8e1076c1cd7294f1c9550e08287f73f and as a bonus, its powered by the all mighty propellor chip. Over the next 6 weeks im going to be buying robonova/lynx brackets, making CAD designs, and prototyping the 5990’s with the BRAT. After those weeks, the production of the actual bot starts. Anybody got suggestions for a name?
Oh and thanks for all your suggestions on my questions, it really helped 
Not a problem, wingzero01w, you do know we hijacked this thread… 
Apologies to PaulP…
Good luck with your bot WingZero01W, keep us posted with pics and progress report (in another thread I hope )
Uh… oops… i uh… well… 
, My bad XD
Yeah ill keep you posted ON ANOTHER THREAD lol… sorry bout that, got a little carried away i suppose. And good luck with your bot aswell! i liked the CAD you did for it, looks impressive.
The 5995 was discontinued, and for good reason. The 5995 had serious heat dissipation issues. The 5990 was its replacement. If they really do have them I wouldn’t recommend you use them. The other two servos are under torqued for robo one applications.
Thanks for the info, im planning on using the 5990’s for my bot, but im gonna be prototyping them on my BRAT first.
For all you 2HV owners, look at this thread on Trossen:
forums.trossenrobotics.com/showt … 8#post6758
Seems like 2HV owners might be able to turn with hips afterall, albeit not as sophisticated as the 1HV, but the possibility is still there
Are the robonova brackets compatible with standard servos such as the 5990s?