350kg High Torque RC Servo, 2 in 1 Mode 16V~24V High Voltage Full Metal Gear Digital Servo Angle 360°

Solid piece of equipment. Perfect for tinkering! Very heavy duty, in fact be careful you could hurt yourself if not careful

I was going to use this servo to provide the steering for a large RC project. The servo is solidly built and has multiple mounting choices. Once I got it mounted I temporarily wired it to the 6S (22.2V)battery being used to power the project so I could center it and connect the front wheels. I applied the power and the power was on for a few minutes before I turned it off. Nothing happened as expected. Next I connected the PWM output from the RC receiver and started to cycle it. That's when the magic smoke was released and a loud pop was heard before I could turn off the power. Before things went wrong the shaft was responding to the controller input. I checked the polarity and voltage of the supply and signal. The batteries were actually at 11.8V with proper polarity. The signal and ground were properly connected. I am using a DumboRC X6FG receiver. The receiver is supplied with 7.4VDC to power another servo. I don't know if the issue was caused by the signal voltage was too high or this was an infant failure issue. I have ordered a replacement servo and reduced the receiver supply to 5.0 VDC.

I have three of these servos, and they're very, very powerful. Crazy amounts of torque, and easy to set up, overall. The physical design is nice, with good placement of bolt positions. Pretty accurate in positioning, too. I wish they had a different and more-rugged power connector, though. One caveat: They're powerful enough and fast enough to be moderately dangerous. Make sure to stand clear of them and _keep your hands away_ when they're powered up. You can limit their arc and initial position easily enough, but if you moved the controller position while they're turned off, they'll go to the new position right away, at full speed and power. I ended up including some physical stops for the lever one was driving, and used a belt drive (that can slip some) for another. For the price, you won't find another servo with more power and features, especially in this form factor.

I got two of these servos for a hackathon project - that meant i had to get these up and running correctly ASAP. I was initially unsure about which size wire to use for the power, so I called customer support and somebody picked up one ring in. He helped me with that question and others, and emailed me some other helpful resources, which is better customer support than 99% of large companies I've ever had to interact with - shoutout Eong! Super unique servo, love the look and sturdy feel and can probably be used for any project where you need a very high power, compact, and easy-to-use servo (I'll definitely be recycling mine to use for future projects).

I'm very happy with these servos but there are a few things worth noting. First is the speed. I've used a lot of much smaller servos before and typically they aren't very fast, these servos on the other hand are extremely fast, do not get in the way of whatever you have connected to them! To slow them down I had to inject delays between pulses like this... void loop() { for (int i = 200; i < 400; i++){ pwm.setPWM(0, 0, i); delay(10);} } This works fine and allows you to fine-tune the speed by playing around with the delay value. Second, as previously mentioned in another review the power connector is reversed from the standard config. No problem if you are building your power cable but if not it could be a serious problem. Third, the power connector they use works great but it adds maybe 5 or 6mm of overall height when the power cable is plugged in, something that wasn't mentioned in the ad or reviews that I saw. If you have plenty of room above the servo it's not an issue but in my case, I had to get creative to make the servo fit in the space I had available for it. Lastly, another reviewer stated that the mount used non-standard hardware, on the two that I received the mounts used standard M4 hardware. They did however allow for M4 nuts to be used on both ends of the mounts, if you use M4 bolts this might be fine but I use M4 button head screws and had to put M4 washers under the screw heads to keep them from being pulled into the mounts. These small issues are why I gave them 4 stars instead of 5.