What are the best high torque, smooth, budget servos for a biped?
HS422?
HS475?
HS645?
I don’t want to spend huge amount of money but I don’t want a weedy, wobbly biped at the end of it all. As servos are the main investment I want to make the right choice.
What do you guys use?
Hey ictiain,
You will need a minimum of HS-5645MG (168 oz. in) servos. A HS-5955TG would do a better job of keeping the biped up and can take loads… If you make the biped light and not a ton of features you can get away with HS-645MG servos but it is highly suggested to use 5645s.
Read my PM.
-robodude666
Which biped are you going to build? The servos you use depends on how large a biped you want to build.
If you are building a BRAT, then you can use HS-475HB servos. If you are going to build anything much larger, digital servos like the HS-5645MG would be the best way to go. Don’t even consider using the HS-422 for a biped.
You should look at the assembly guides here for the biped you want to build before you buy any parts. This is a great way to see what will be required.
8-Dale
I am making a custom scout… I want to end up with a full biped and am using 3mm perspex. I hope to keep the weight down.
I will be posting some info on the projects board quite soon.
The 475 is a nice cheap servo but only has 4Kg/cm is that likely to be enough? Do ankle joints need more? I don’t know how much a typical scout weighs?
S9350 seem powerful and cheap… has anyone used them? What is their resolution, response time etc?
S9350 <- 139 oz. in. for $99.00
HS5645MG <- 168 oz. in. for $54.99
Am I missing something here? 
Um, they are almost 2x the price and 3/4 the torque of the Hitec HS-5645MG. 
And the Hitech servos are high quality! 
Ah, those are not Futaba S9350 servos, which is what most people would have expected with that part number. They have gone out of their way to name it the same as an existing commercial product and sell them on e-bay with a splash and dazzle page deliberately intended to suck people looking for the real thing into buying them… the words “run away” seem to resonate in my mind for some odd reason. 
I would tend to agree with the “run away” assessment, there. Or at the very least, keep in mind the old adage, “Buy cheap, buy twice.” For something that will be placed under stress as often as the servos of a biped will, go with reputable brand that is known to work in that application.
I learned the hard way i kept trying to save a bit on the servos too. I got a good deal on some hitec hs985’s -> they kept slipping and not holding its position. got a few HS5645’s and now i’m using the 985s for the claws
Best to go with the 5645’s, there good and you know it, They won’t let you down!
HS-475’s do not work on the Scout. It will not hold itself up and is impossible to program. HS-645 have almost enough power for a basic step.
Ask me how I know…
HS-5645 are the bare minimum. You WANT digitals and you want over 100oz/in. I tried to make it work with less, and no go. Now I’m waiting on 12 X HS-5645.
lynxmotion.net/viewtopic.php … c&start=15
In this thread on page 2, I got my scout and started on experimenting with the HS-475’s. To sum the last 3 pages up, It didn’t work.
And like the other said, the S9350 servo is a overseas clone trying to impersonate a Futaba servo. They are cheap for a reason. They are garbage.
Hitec is the way to go. And you always get what you pay for with servos.
If you get some good digitals, you will be very happy with your scout. And you won’t have to upgrade your servos when you add the top half of your robot.
thats a terrible price. 70 Euro’s and 30 Euro’s for shipping??? Unbelievable
it’s 20 servo’s for 70 euros, and still 30 for shipping is expensive… and you see the gears are in plastic and the stall torque is under the 5645’s…
ahh 20. that is not bad at all actually. I thought it was 2 
WOOPS 
at that price 5645’s are less expensive!
What is the best price for 5645s shipped to the uk? and where from?
