Originally Posted by Transman
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Originally Posted by TimS
Have been working on various vibration issues with my 72 Roadrunner, 400, 727 car. I have one with the motor from around to rpm or so while the car sits. So pronounced that the steering wheel and dash vibrate quite a bit. Doesn&#;t do this at idle around 800 rpm or when you get in the / range. I unhooked the alternator, fan and power steering belts. Still have it. I noticed the crank pulley is pretty wobbly. Bad crank pulley cause this issue or does it sound more like a bad damper?
Thanks.
When did the vibration start?Always there since the engine was built or did it start on it&#;s own or ?If from day one realize that a normal 400 is externally balanced - meaning it takes a special damper and converter or flywheel.
Previous 30+ years owner isn&#;t sure when it started but that it&#;s been there for quite some time.The damper on the motor does have a good size weight on it. Previous owner did have the motor rebuilt over 25 years ago but couldn&#;t recall if the vibration has been there that long or not.What is special about the torque converter and flyweel?
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Thread starter
haru87
Start date
Sep 12,Tags
In summary, the conversation is about someone asking for help with creating a general work instruction for motor vibration analysis in the maintenance sector. They are looking for guidance on which points to test for vibration and the methods to use, with a focus on the location and position. The motor in question is an electric motor coupled to a centrifugal pump and the application is commonly found in petrolchem plants. The maintenance involves checking vibration readings weekly and performing rectification if it exceeds 0~0.10mm/s. The suggested methods for testing include looking at axial vibration, relative phase, and vertical and transverse measurements to indicate any issues with angular misalignment or rotating imbalance. Spectral analysis can also be used to diagnose any bearing problems.
haru87
Hi everyone, this i my first post here. I need some help in doing a general work instruction for motor vibration analysis. I am totally new in this maintenance sector. I could do with some help :)
Basically i need to know which exact points i have to test for vibration and method to be use. Dont need to be too detailed, crucial thing is where and which position. I search the web and they don't really mention much on how to do a simple test.
I thank you guys in advance for the information you provide.
Science Advisor
Gold Member
what kind of motor?
what is application?
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Science Advisor
Gold Member
What sort of motor? What application?
What are you testing for vibration for?
haru87
It can be any electric motor coupled to a centrifugal pump.
It is mainly a weekly maintenance thing. To check the vibration reading to ensure it is running in good condition.
If vibration reading exceeds 0~0.10mm/s rectification will be done as a part of preventive maintenance.
Its application is commonly found at petrolchem plant. running at above 70degrees c.
I hope i answer and give enough details for you guys to help me ._.
Science Advisor
Gold Member
Well, if you've already got a criteria to indicate maintenance is required, use that.
I'd look at axial vibration on both the motor and pump and the relative phase thereof; this will indicate whether you have an issue with angular misalignment between the two machines. I'd also look at vertical and transverse measurements to indicate any rotating imbalance. You might also want to do some spectral analysis (compare to a baseline regularly) to diagnose any bearing problems.
Motor vibration analysis is a technique used to measure and analyze the vibrations produced by an electric motor. This analysis can provide valuable insights into the health and performance of the motor, helping to identify any potential issues or defects.
Motor vibration analysis is important because it can help prevent costly breakdowns and downtime of equipment. By regularly analyzing motor vibrations, potential issues can be detected early on, allowing for maintenance or repairs to be done before they become more serious problems.
Motor vibration analysis involves using specialized equipment, such as accelerometers and vibration sensors, to measure the vibrations produced by a motor. The data is then analyzed using software, which can provide insights into the motor's condition and performance.
There are several benefits of motor vibration analysis, including improved equipment reliability, reduced maintenance costs, and increased energy efficiency. It can also help extend the lifespan of the motor and prevent unexpected breakdowns.
Motor vibration analysis should be performed regularly as part of a preventative maintenance program. The frequency of analysis will depend on the type of motor and its usage, but it is recommended to perform it at least once a year or after any significant changes or repairs to the motor.
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