The Power HD 1218TH is one of the strongest standard-size servos we carry, especially when powered at 7.4 V. It has many premium features, including a coreless motor with an all-metal (titanium-covered aluminium) gear train, digital control electronics, and two ball bearings on the output shaft.
The HD-1218TH is one of the strongest standard-size servos we carry. Digital electronics combined with a coreless motor, titanium-shielded aluminium gears, and two ball bearings give this servo a distinct edge over typical standard-size servos. Unlike typical hobby servos, the 1218TH has an operating voltage range of 6 V to 7.4 V. This servo works with standard RC servo pulses at frequencies up to 333 Hz. The 12″ (300 mm) lead is terminated with a standard “JR”-style connector, which is Futaba-compatible. The picture below shows an example of the hardware that might be included with this servo (hardware might vary).
An example of hardware included with the Power HD 8312TG, 1218TH, and 1207TG servos. Actual hardware might vary
The picture below shows the all-metal, titanium-shielded aluminium gear train and ball bearings that help the servo deliver such high torque.
Titanium-shielded aluminum gears and ball bearings of the Power HD digital servo 1218TH
You can find more information about this servo under the specifications tab and in its datasheet (380k pdf).
Note that, as with most hobby servos, stalling or back-driving this servo can strip its gears.
| Size: | 40.3 × 20.2 × 37.2 mm |
|---|---|
| Weight: | 64 g |
| Digital?: | Y |
|---|---|
| Speed @ 6V: | 0.18 sec/60° |
| Stall torque @ 6V: | 18.0 kg·cm |
| Speed @ 7.4V: | 0.16 sec/60° |
| Stall torque @ 7.4V: | 21.0 kg·cm |
| Lead length: | 12 in |
| Hardware included?: | Y |
Pololu - Common RC servo connectors. From left to right: Futaba, JR, Airtronics Z
Most standard radio control servos (and all RC servos we sell) have three wires, each a different colour. Usually, they are either black, red, and white, or they are brown, red, and orange/yellow:
Please check the specs for your servo to determine the proper power supply voltage, and please take care to plug the servo into your device in the proper orientation (plugging it in backwards could break the servo or your device).
We do not specify the range of rotation of our servos because this information is not generally available from servo manufacturers. RC servos are usually intended for controlling things like the steering mechanism in an RC car or the flaps on an RC plane. Manufacturers make sure that the range is enough for these typical applications, but they do not guarantee performance over a wider range.
This means most RC servos will rotate about 90° using the standard 1–2 ms pulse range used by most RC receivers. However, if you are using a controller capable of sending a wider range of pulses, many servos can rotate through almost 180°.
You can find a servo’s limits if you use a servo controller that can send pulses outside of the standard range (such as our Maestro servo controllers). To find the limits, use the lowest possible supply voltage at which the servo moves, and gradually increase or decrease the pulse width until the servo does not move any further or you hear the servo straining. Once the limit is reached, immediately move away from it to avoid damaging the servo, and configure your controller to never go past the limit.
You might be wondering why we do not just follow the above steps for all the servos we carry and list a specification for degrees of rotation. Unfortunately, since servo manufacturers do not specify the range of rotation, it might change from one manufacturing run to the next. They will not inform us about changes that are not specified, and we have no way of knowing if or when they might change their manufacturing process.
For more information about servos and how to control them, we recommend the series of blog posts on servos starting with: Introduction to servos.
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