Dynamic Balancer for Small Parts and Spindles
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- Опубликовано: 15 сен 2024
- Worlds ugliest Franken-Balancer. A small experimental prototype made completely from chunks of scrap metal. Now replaced by a full size permanent dual axis balancer, this little Hobo is still used to balance batches of small parts because it is easy to set-up and knock down and does an excellent job on small parts and spindles. Because all of the 'guts' are exposed, it is perfect for demonstrating the basic theory of operation.
That is very cool. I bet that most people wanting to know how it is built are more curious than serious about actually building one. Just watching yours makes me want to build one, but of course I never will (having no need).
Great explanation, and thanks for showing it!
What a fantastic demonstration! Brilliant design!
There are a number of videos on RUclips that show the typical 'two target' dynamic balancer screens. They are all very similar so for those who are interested in how commercial balancing software presents the data visually, there is plenty of information available. However, I have not seen any videos that explain what the components are or how a dynamic balancer works. My short video does not duplicate the many that are already posted, but instead provides the underlying information one would actually need to understand the process. I discourage amateurs from building potentially dangerous machines. However, it becomes possible, proceeding at your own risk, to build a machine only if you know how it is supposed to work. And now you do.
This is a very cool things that I ever seen in my life. I think it's unique,simple nice and smart. Everyone who are in this way will like it because they all are would like me. I appreciate and thank to those who show me.
Excellent demonstration, and a clear explanation. Very interesting.
Van you show the data accumulated from the accelerometer and angle sensor and how to make an interpretation?
Thanks, again great video. I have been curious about the balancer since it was mentioned in one of the much earlier videos.
For the hub just drill two set-screw ports at 180deg to each other and then do the final with the collar attached. This would likely reduce resonance points making final balancing less complicated.
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Simpsons36 On this balncer is that knurled knob just an adjustable stop?
Great demo and basics about balancing... ;)
Where is the new one?
can ı use this for motorcycle wheel balancing?
I was searching for this kind of example, now I am happy, can you make single cylinder 4 strock engine example ?
Interesting, I have not seen one of these before. However, you jumped from running the device to a magically balanced part. I am guessing that after running the software the mapped out-of-balance points are retrieved by manually turning by hand until they are straight up, down, etc, or on a pointer so you know where to drill/lighten? Would it be possible to show the software screen(s) while running and how the end results are displayed? How many accelerometers are used? Two per axis (X,Y)?
All good questions. The electronics are on my other balancer and that is where the screen is. On the little guy, an accelerometer is on the back of the floating carriage and I just move the cable and encoder from the other machine to use the little one. The cable does not reach to the 'video' bench where the lights are, so I had to move the little machine back there to do the actual balancing.
To answer your Q's:
*Only one accelerometer is used. In Balancer speak, 'two axis' typically means the same plane, but on each end of the part. The little balancer actually has a floating carriage at each end and with a part mounted between the carriages, both ends can be balanced. A second accelerometer is then needed.
*Yes, the software records the azimuth of the imbalance and takes into account gyroscopic precession. My software only provides a 'severity' rating on the imbalance, not the actual amount of weight to add. That is a complex task that I do not have time to program with my schedule. I drill until the imbalance switches sides and then counter drill tiny amount until the imbalance switches back. That is why there are small holes opposite the main balancing hole clusters. Even where software indicates the amount of weight to remove, it is a bit of a guessing game to drill the correct depth to remove precisely the right amount of material, so you still end up doing a couple of iterations. Balancing a part like the one demonstrated takes about 30 minutes.
*I am trying to keep these RUclips videos short and informative. They are not meant to be comprehensive training on any particular topic. I do make that type of video on a consulting basis, i.e. they are owned by the customer, and therefor I cannot post them here.
Great, thanks for the additional insight. Having a single accelerometer (per end) certainly makes it simpler. It does makes sense that the imbalance is on a single plane and there is no need for additional accelerometers. I certainly understand how it can be trial and error in determining the volume to be removed.
Simpsons36 First of all I'd like to say, *Great video!* Did I see that at certain particular RPM wobble kicked in that wasn't observable at other RPMs? I suspect this has to do with resonant sympathetic oscillations which are contingent on the length of the axial. Do you know if it is better to gather your data at the in sync RPMs or the out of sync RPMS?
ExtantFrodo2 If by 'wobble' you are referring to the momentary lateral movement at high RPM, this is caused by torque reaction to rapid speed changes (acceleration). Torque reactions on rotating masses are subject to gyroscopic precession.
That's a big topic.
Simpsons36 so there's no specif RPM which when held constant would exhibit that back and forth wobbling like what happens on a swing that is pumped in sync with the natural period of the swing and not when the pumping is at a different rate?
Can I ask what you are using to to input all of your sensors to your computer?
+S Vin For the first 'proof-of-concept' machine demonstrated in this video, the software runs on an Arduino MEGA and collects the data from the sensors. That processor does not do the calculations, it collects the data and forwards it on to the computer where a separate program does the calculations and displays results in a GUI.
I was wondering if you could send me on a path to find the software you were talking about.
+S Vin I wrote the software that I use on my balancer. What is shown in this video is the first 'proof of concept' prototype. Later a larger permanent machine was built with proper containment fixtures and guards. You can find some software and entire machines on ebay by searching on 'dynamic balancer'. Prices start just under US$2,000
I have a question, what is the resolution of your rotary encoder? Thanks, Ron.
www.usdigital.com/products/encoders/absolute/rotary/shaft/MA3
Simpsons36 Thanks for the information.
Amazing
interesting stuff. thanks!
This is with electronics, how they doing it in the past like 30's to 50's
we cant hear you, your mic is low in sound.
F.... 😂 it is dangerous. No comment guy no comment
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This just looks like static balancing. I don't see any ability here to do dynamic balancing.