Weird sound comming from servo

Hey everyone,

I recently changed the servo motors of my 7bot arm. The new ones are KST X20-8.4-50 servos. Everything works well except that they make a veee sound. Does someone have an idea what the problem is? Im using a Arduino Due Board to control the servos.

Thanks in advance!

Link to video https://drive.google.com/open?id=0B4DT1gHpvLasZWdLREFHbWFhQzA

From watching the video, I think that this is the sound of a digital servo under load. Take one of the new servos out of the arm and run your application. Watch the servo move without any load. Does it make the same noise? Manually apply some resistance to the servo arm as it moves. Not enough to strip the gears, but enough to make the servo work a little as it moves. Does it make the same noise?

You've no counterbalancing and metal arm, so a lot of constant torque on the servos - watch out for overheating.

Most servos can only tolerate their max torque rating for a short time, ie its not a continuous rating. Metal bodied servos can dissipate a lot more heat and thus handle more load - yours appear to be metal with coreless motors so are probably pretty tough. The specs do not mention power dissipation or max continuous torque though...

They do mention the 333Hz PWM frequency which is what you can hear...

vinceherman: From watching the video, I think that this is the sound of a digital servo under load. Take one of the new servos out of the arm and run your application. Watch the servo move without any load. Does it make the same noise? Manually apply some resistance to the servo arm as it moves. Not enough to strip the gears, but enough to make the servo work a little as it moves. Does it make the same noise?

yes, thanks for your help! i tried this and they did the same noise...

MarkT: You've no counterbalancing and metal arm, so a lot of constant torque on the servos - watch out for overheating.

Most servos can only tolerate their max torque rating for a short time, ie its not a continuous rating. Metal bodied servos can dissipate a lot more heat and thus handle more load - yours appear to be metal with coreless motors so are probably pretty tough. The specs do not mention power dissipation or max continuous torque though...

They do mention the 333Hz PWM frequency which is what you can hear...

servos seem to stay cool, so you think it's "normal" they are that loud?

this might help

https://www.youtube.com/watch?v=ZsvNVPCetmI

Why are you resurrecting a zombie-thread?