DOCYKE 550kg High Torque RC Servo, 2 in 1 Servo and Motor 16V~24V High Voltage Full Metal Gear Digital Servo

I am building a large (5 foot tall) robot for Halloween and needed a way to rotate the head (a 16" plywood cube). This easily handles the job and is far more powerful than the strongest 1/5 hobby RC servo that I could find at double the price. It also has a D-profile 8mm output shaft which is much better for high torque applications than a 25T RC servo output. I really like the manual potentiometers for precision adjustments of center point and range. Mounting this is easy as well. Lots of holes with pre-molded nut retention, etc. The plastic housing I believe is glass reinforced nylon so is very strong.

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 purchased one of these DOCYKE servos to use in industrial automation. I hooked this up to a test unit that outputs a PWM signal and the unit works really well, and very accurate. Soon I will test for durability using about 50% of its continuous capacity. I consider this to be a really great solution because it is compact, easy to operate, and it is very affordable.

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.

The difference between the s350 and s550 is the planetary gear ratio. I use both of these. The S550 is slower but has 57% higher torque. The mounting holes are the same. Electrically they are similar. The power connector on the s550 is capable of higher current and is an improvement over the 2.54 mm spaced pins on the s350. My application needs two of the higher torque units, but the final drive gears failed on one (per mfg specs, the motor torque limit should have prevented this). Amazon immediately replaced the bad unit.

Bought this for a holding mechanism that needed precise control - and the ability to have usefulness in other areas (servo or regular motor). What a great product and excellent seller! Definitely watch the video on the last image of product description (explains light codes, setting, etc). Also, note that for direction control in motor mode, use PWM with the following logic: 0-49% = motor goes forward 50% = stops (holds position) 51-100% = motor goes backwards Use direction toggle to switch these. Great value for the money. Will continue to be useful and last a long time. Seller also responds quickly to emails - so don’t hesitate to contact them with questions!