Worst case scenario is the back voltage to the main motherboard. But as the technology is going forward when it comes to premium products, there are more safety standards in mind.
Trust me, nobody in the D&D thinks about this scenario because fans usually do not output any significant voltage to the motherboard if you spin them with compressed air, so it can not do any damage to the motherboard
@@dtibor5903 trust me, every good designer thinks about this scenario because the mentality when designing is not "oh, let's design for ideal conditions", the real mentality is "let's design this to survive if the average user tries to tinker with it"
@@LuisElectronico regardless of talent (good bad engineer) consumer products are designed for low cost, not for reliability. They must sacrifice protection if the probability of failure is quite low.
It doesn’t. Arguably it will clean better to hold it still and blow it out. I just didn’t hold it still in my previous video and that upset a lot of people.
While the testing methodology is not scientific it will do for me. I have used this method (with short bursts or air) without any issues for years. Beware on compressed air, hold it upright otherwise most cans will spew out frozen co2 which can actually do damage
Most fan/blowers don't run that fast - maybe a few thousand RPM, and ball bearings are often rated up to 35,000rpm, so I don't think bearing damage or load is the issue. With compressed air (not your wimpy hand-held blower) you can get eye-watering speeds, and given that the centrifugal force goes as the square of the speed, going twice the rated fan speed will create a load 4x what the fan blades are designed for. On the electrical side, the voltage generated goes up as the speed of the fan. If the fan is designed for, say, 24v and you run it at 2x speed, it can generate up to 48v that gets pumped into circuitry designed for 12v. Caps, transistors, etc. all have a maximum voltage they are rated for and manufacturers rarely use a voltage safety factor much above the supply voltage, so it's easy to see damaging some electronics as well if you don't unplug the fan altogether before spinning it up.
Are people really that pressed about this? The amount of time that the air would have to be held to the fan to shorten the life of it substantially would have to be a long long time. The wiki even has this method of cleaning for regular maintenance.
the mechanical aspect is really not an issue here, electronically yes the fan generates an electric current, but any decent circuit board has protections in place to make this not an issue
Is inducing voltage an issue, then? Moving the gantry can make the screen of some of my printers turn on which is known behaviour, so I suspect there may be some protection, but is there in the hotend/chamber fans of the Bambu printers?
Yes, inducing voltage where it's not supposed to be, and in circumstances where it's not supposed to be there, and in uncontrolled 'quantities' is absolutely a problem. There's some protection against this in some circuitry in the form of diodes, but there's no telling where those diodes are (if they exist), how much voltage they can protect against before substantial leakage occurs, or what circuitry exists between the induced power and the protection circuitry.
How do you know you are not exceeding RPM limit of the bearing? This little vacuum is safe, I agree, however your testing is flawed.. Compressed air will kill your fans bearing. It will be down the road when you think you got away with it.. Then... Death rattle..
Bro, most of the cheapest bearings can take a lot more than that. At the speed these are spinning, they are barely over operating. Now if you used a real compressor and the thing starts to whine, you know there is force on the bearings.
Was looking forward to analysis of protection circuits on on the motherboard, but got anecdotal evidence instead. :(
Worst case scenario is the back voltage to the main motherboard.
But as the technology is going forward when it comes to premium products, there are more safety standards in mind.
Trust me, nobody in the D&D thinks about this scenario because fans usually do not output any significant voltage to the motherboard if you spin them with compressed air, so it can not do any damage to the motherboard
@@dtibor5903 trust me, every good designer thinks about this scenario because the mentality when designing is not "oh, let's design for ideal conditions", the real mentality is "let's design this to survive if the average user tries to tinker with it"
@@LuisElectronico regardless of talent (good bad engineer) consumer products are designed for low cost, not for reliability. They must sacrifice protection if the probability of failure is quite low.
@@teddysoft and don't have illusions: most transportation related and automotive circuit designs are absolutely cost focused
My little desk fans died after cleaning with compressed air
Confused. How does allowing the fan to spin with the airflow clean any better than holding the blades still while you clean them?
It doesn’t. Arguably it will clean better to hold it still and blow it out. I just didn’t hold it still in my previous video and that upset a lot of people.
While the testing methodology is not scientific it will do for me. I have used this method (with short bursts or air) without any issues for years. Beware on compressed air, hold it upright otherwise most cans will spew out frozen co2 which can actually do damage
Most fan/blowers don't run that fast - maybe a few thousand RPM, and ball bearings are often rated up to 35,000rpm, so I don't think bearing damage or load is the issue. With compressed air (not your wimpy hand-held blower) you can get eye-watering speeds, and given that the centrifugal force goes as the square of the speed, going twice the rated fan speed will create a load 4x what the fan blades are designed for. On the electrical side, the voltage generated goes up as the speed of the fan. If the fan is designed for, say, 24v and you run it at 2x speed, it can generate up to 48v that gets pumped into circuitry designed for 12v. Caps, transistors, etc. all have a maximum voltage they are rated for and manufacturers rarely use a voltage safety factor much above the supply voltage, so it's easy to see damaging some electronics as well if you don't unplug the fan altogether before spinning it up.
Are people really that pressed about this? The amount of time that the air would have to be held to the fan to shorten the life of it substantially would have to be a long long time. The wiki even has this method of cleaning for regular maintenance.
The wiki is bad and should feel bad, then.
the mechanical aspect is really not an issue here, electronically yes the fan generates an electric current, but any decent circuit board has protections in place to make this not an issue
Next compressed air.
Is inducing voltage an issue, then? Moving the gantry can make the screen of some of my printers turn on which is known behaviour, so I suspect there may be some protection, but is there in the hotend/chamber fans of the Bambu printers?
Yes, inducing voltage where it's not supposed to be, and in circumstances where it's not supposed to be there, and in uncontrolled 'quantities' is absolutely a problem.
There's some protection against this in some circuitry in the form of diodes, but there's no telling where those diodes are (if they exist), how much voltage they can protect against before substantial leakage occurs, or what circuitry exists between the induced power and the protection circuitry.
Some fans die if you spin them with compressed air, but not all
I swear I bricked my 2070 during a case cleaning. Much more careful now.
How do you know you are not exceeding RPM limit of the bearing? This little vacuum is safe, I agree, however your testing is flawed.. Compressed air will kill your fans bearing. It will be down the road when you think you got away with it.. Then... Death rattle..
Bro, most of the cheapest bearings can take a lot more than that. At the speed these are spinning, they are barely over operating. Now if you used a real compressor and the thing starts to whine, you know there is force on the bearings.
😂