I’m looking for an analogue Low Profile High Torque Servo that can offer that similar power to the HS-645MG servos at 133oz?
I am working on a new Hexapod ‘ergo’ leg design, that will require a slimmer look.
any ideas guys and gals?
something like this:
http://www.hitecrcd.com/photo.php?pi=523&size=eight
The HS-77BB looks about right. It has 76 oz. in. of torque. They also have an HS-7775MG which is digital and has a torque of 125 oz. in. Your image is of the retract servo which does not have a linear response. It’s nick name is bang bang…
can digital servos be used straight from the box? i understand that a programmer is needed to extend the resolution, but what else would one require one for?
i think i may have over killed the amount of torque i would require and i’m quit happy that 76 oz would be enough. this will be for the tibia.
After all we are using 83 oz.-in in the BH3-R Hexapod, and that weighs 3lb 13oz!
The other joints will use 645’s on the Femur and a 225BB’s on the Coxa.
my predictions are that it will weigh about 3lb-ish, as i will be using expanded PVC foam board for the construction. as i beleive you have also done for the Lynx-A-Pod!?
The digital servos will benefit from being programmed to increase the range to a full 180 degrees. It can also be used to adjust the deadband, speed, direction of movement, etc. Yep I love the PVC. It’s very easy to work using common wood working tools. 
yes, after building the interior of the Alien head out of it i found it very easy to cut, “with a Stanley blade” sand, heat to create bends, drill, etc. i have a large stack next to my desk ready to be formed into my new idea.
thanks for the info Jim.
I’ve been playing with a HPP 21+ plus programmer and the HS5485hb , and I like it!
What Jim said, and it can also be set up for some “protection”.
At the price, it would be nice if LM could carry it. That, and maybe make up a servo “compass” of some sort like you know who’s.
I have that as well.
Alan KM6VV
Can do on the programmer. Will try on the protractor.
Let me know if you need pix or comments on the protractor.
Another question, is there a digital version of the HSR-1425CR (57 oz.in.) Continuous Rotation Standard Servo, or is it a simple job to modify the HS485hb or HS5485hb servos (I’m guessing they have the same drive) to continuous rotation?
The HSR-1425CR servos have a very limited “control band”. I’m hoping the HS5485hb might be a little bit better in that regard. And maybe it would be possible to re-configure them to standard rotation later if desired. (I know, I just need to take them apart and see).
I did see a small range of speed adjustment on the HSR-1425CRs I have, but I’m not yet satisfied with the adjustment table I’ve incorporated in my 'bot code to keep the wheel speeds equal. (I might still have a bug).
Although I doubt it, the two servos could just be poorly matched (?). they are turning in opposite directions.
My “table” should allow for corrections at stop, slow, half, fast and full, although corrections don’t really apply at full.
[code]
/* servo values HSR-1425CR */
#define FullFwd 1650 // i4
#define FastFwd 1600 // i3
#define HalfFwd 1550 // i2
#define SlowFwd 1525 // i1
#define StopFwd 1500 // i0
#define SlowRev 1475 // i1
#define HalfRev 1450 // i2
#define FastRev 1400 // i3
#define FullRev 1350 // i4
int ServoOffsets[9][3] =
{/* LEFT RIGHT SPEED /
{-14, -12, FullRev}, / i-4 1350 /
{-14, -12, FastRev}, / i-3 1400 /
{ -7, -19, HalfRev}, / i-2 1450 /
{-13, 0, SlowRev}, / i-1 1475 /
{ 4, -17, StopFwd}, / i-0 1500 /
{-13, 0, SlowFwd}, / i 1 1525 /
{-18, -8, HalfFwd}, / i 2 1550 /
{-13, -13, FastFwd}, / i 3 1600 /
{ -7, -19, FullFwd} / i 4 1650 */
}[/code];
Thoughts?
Alan KM6VV
HS-645MG to expensive to me
surabayahobby.com/produk_265_hs-645mg-high-torque-servo-motor-%28metal-gear%29.html
Sorry about that!
Alan KM6VV
