RC Servo Torque vs Force and the Importance of Mechanical Advantage
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- เผยแพร่เมื่อ 14 มิ.ย. 2020
- Servo Torque can be multiplied by the amount of mechanical advantage that a system provides. The multiplication of torque can either increase torque or decrease torque as shown in the video. Torque is defined as a force at a distance. Since servos have fixed maximum outputs, the only means of improving either force or distance is by sacrificing the other.
- วิทยาศาสตร์และเทคโนโลยี
Im so happy that you are still making videos.
I have no plan to stop.
Thanks for sharing your knowledge.
Greetings from the Netherlands 😀
Hey Martin, thanks for the comment! Cheers from Canada!
If you need a precise distance, be certain to calculate the arc length and not directly point-to-point.
Also the greater the distance travelled the better the resolution.
Very good point! I was playing around with the radio and setup over the weekend looking at the difference in resolution of a micro size servo when EPA is brought to 50%. This will be in a future video.
Imteresting
Kg/m - kilo per meter. Thats the SI system.
Well.. 10 Newtons = 1 kg.
So if we have 155Nm its:
15.5 kg/meter.
U can define mass as a force, its kgf..
(if i undersood your Q. right..)
Hey Thanks ETAI106! I was just looking for the true unit of force in the SI(metric) system as well as the unit of mass for the imperial system.(not a term that is heard often) If the metric mass unit is used as a force I would prefer it to be written as you described kgf. However, it is still awkward. It's uncommon to see torque measured in terms of kg for most mainstream applications.
@@RCexplained
Im at the automotive industry..
All the technical literture from cars manufacturers ive seen, they do use Nm..
Except the American ones...
I live in Israel, here as well we use Nm at almost all application ive run into.
lbf or oz are very very rare to me..
Newtons are not kilograms. [N] = [kg * m / s^2], or mass * acceleration as in F = m * a.
Newton is the SI unit of force.
Torque = force * level arm, or τ = F * r, so in SI units [N] * [m], or [Nm] (Newton-meters)
Servo specifications in the rest of the world commonly use [Ncm] (Newton-centimeters).
If divided by 1g (Earth's gravitational acceleration of 9.81 [m/s^2]) your basically calculating F/a = m, so the resulting unit for this way of specifying servo "torque" (not really) is [kg*cm]. This is also a common specification.
(The weight of 1 kg under Earth's gravitation is sometimes called kilogram-force or kgf but this is not standard SI.)
So if a spec sheet says 9.81 Ncm or 1 kg*cm then you can hang a 1 kg weight from a 1cm long horizontal servo arm and the servo should be able to hold it.
@@xnoreq dang john... u wrote even better than my notebooks from collge..lol..😂🤣
Could use better lighting mate. The use of the whiteboard reminds me of Jason Fenske from Engineering Explained 👍
Hey Isogen. Thanks for the comment. I'm struggling a bit with equipment, not just with lighting. Serious lighting is on the way for next WB video. Jason from EE is brilliant!
Conspiracy! This clever genteman is a servo horn manufacturer shill! He just make us realise, we have too long servo horns. ;-p
Thanks for the video. My E-firestorm definitely could have shorter servo horn, although theoritically the speed is also important and I'll loose some if I swap.
But for crawlers...so important and so usefull knowledge! Also what hasn't been mentioned, if speed is not an issue, going for weaker servo, but maximising servo horn choice (as short as possible to work), you can actually save some battery. Which also mean less heat in ESC/BEC
Hey Polish guy, thanks for the excellent tips and the comment!
I find that by using 2 control rods (so there is push-pull at all times), it seems that the operation is altogether smoother. It's no empirical proof, just my observation. (Failing that, it may just be my illusion!) Any thoughts guys?
Hi Remko, I've never seen a setup with 2 control rods being used other than an outboard boat engine. Dual rods were used here for stiffness of the rods as the weight of the outboard is quite significant. Comparing pull pull vs push pull, my preference is push pull using one solid rod.
Nice can you do a video about gyros
Hello, what points on the topic of Gyros would you like to have coverd?
@@RCexplained topics : benefits of gyros ,proper setup and installation ,adjusting gain, is the gyro in the right orientation things like that
kgf is just (N.m)/9.8. since the gravity 9.8mS²
Aaah torque wrench! The tool needed to add torque to your cars engine ;-p
Always could use more torque!
Hi I can subscribe your channel