Nikola Tesla's Dynamic Balancing Machine for small Tesla Turbine rotors + FREE goodies
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- Опубликовано: 4 окт 2024
- This video shows my replication of Nikola Tesla's dynamic balancing machine, heavily inspired by Paul Townley's design, which allows you to precisely balance Tesla Turbines both statically and dynamically in one go!
The total costs of my setup are less than $500, while a Chinese made small rotor balancing machine will set you back at least $10k.
I explain Tesla's balancing patent and some museum documents, and show you how to true and balance a rotor, including speed and vibration tests.
And here are some free goodies:
Link to the 3D models and bill of materials of the balancing machine, as well as the critical speed calculator:
drive.google.c...
My open-source Tesla Turbine Telemetry suite:
github.com/nic...
🚀 SUPPORT PAUL'S TESLA TURBINE RESEARCH ON PATREON
/ teslaturbo
Follow Paul's work on RUclips:
/ @nikola.tesla.r.and.d....
It’s been a big collective effort on this topic from Jeremiah, Rob Meades, Waert, Charlie Solis, myself and now you Nick.
Sterling effort!
I love how you came to visit us in England and within a week boom! 💥 you had it almost nailed!
If you want the vibration gauge to be more sensitive, screw a shorter threaded bar inside!
I used magnet cubes on mine but the rotor weighed 1.75kg.
If you are going up the rev range then you should get four times the vibration every time you double the rpm.
Looking forward to when anyone can use this apparatus so they can balance their own rotors accurately.
Still got to sort out the maths for my version as it’s slightly different and there are a number of ways to calculate the critical speed of multiple load shafts.
I have already designed polyurethane inserts for my setup as using magnets is a bit too yieldable in my experience.
100%! This design is heavily inspired by your balancing machine, and I learned a lot from seeing you and Si balance your large rotor (like coloring the edge for the truing).
@@Waveguide I've got so many ways we can improve that setup. Eliminating the causes of the wobbles is going to make a huge difference. There could be zero dynamic imbalance and that small wobble would cause mega resonance at higher rpms, as it's an induced dynamic imbalance. Might be 1mm wobble at 100rpm but then it becomes 5mm at 1240rpm. We got it down to about 0.1mm by switching to 1 magnet per side. We even ditched the circlips and used tape instead to go further. One way or another we will balance this rotor and report our findings. It's never going to be over 100% efficiency but when the rotor starts driving the motor, it will become very obvious on the belt tension, and that is something you cannot fake.
Bravo to all of you!
Magnificent work! A very fun project. And making your data and methods available to the Tesla Turbine community is greatly appreciated and just the right thing to do.
New subscriber!
Thoroughly enjoyed this video! Well done and thanks for sharing! One possible hidden variable might run-out from the dremel chuck and disk. Look forward to seeing more of this channel 👍
Building one turbine in Europe for your home is necessary in this time and im a bit late but tnx for free calculator and information you saved me some time ♥️
I have been thinking now and maybe shaft length you use should be more like distance between bearing not complete length. Thats in bigger model
Probably a little late on this comment, but I appreciate that you are being meticulous about your construction as tesla would have. Two notes: 1) you didn't have any weights on your balance gauge. I believe it would have been more sensitive if you had put them on. You would want to increase its sensitivity after each stage of grinding to get a better reading as your rotor is becoming more balanced with each grind. 2) when looking at the graphs of vibrations on your phone, the scales of the two graphs are different which led you to a misleading conclusion. While you did see a more uniform vibration over time, the actual magnitude of the second run was higher overall. Your first run saw around 1 m/s^2 for a period, 2 m/s^2 for another period and spikes up to about 3 m/s^2. Your second run saw an almost uniform level of 2 m/s^2 with some spikes up to 3 m/s^2 and a few outliers up around 4 m/s^2. Definitely check your scaling when comparing data. Also you should take an FFT of the data (not sure if that app will do it) which will show the amplitude vs frequency rather than total vibration vs time. This might give insight into which frequencies your grinding is affecting and which one's it isn't. This may also give better insight into what the actual resonant frequency of the rotor is, as you should see a massive spike at that frequency if you are able to physically hit the RPM necessary. Also which direction is measured as Z relative to the shaft of the rotor when you are running it? If Z is inline with the axis of the shaft, your grinding will not have a great affect on that axis, as an unbalanced outer diameter will mainly affect X and Y dimensions. Again it depends on the orientation of your phone relative to the axis of the shaft.
Edit: Actually since your phone is sitting on the table, X and Y technically aren't coupled to the turbine at all. The only vibration you are really measuring is what is translated through the table which will show up as Z on your phone (assuming Z extends out of the screen of your phone). What is translated through the table may be a coupling of all three coordinates, but is most likely contributed mainly by the axis of the turbine which is perpendicular to the table.
Yeah plenty of issues indeed with the way I was measuring. Professional balancing systems use several dedicated accelerometers and sometimes even lasers to measure things properly. Outside of my budget unfortunately, but worth paying more attention to my measurements in general as you pointed out. Thanks!
very well done sir and Stirling effort all round 😍i think you will certainly progress this moving up the scale for sure. love the demo and explanation thankyou..
Wow thank you so much. Legend 👏🏻❤️✊🏼
Very very cool! So much research and manufacturing time. Thank you so much for sharing your journey.
Thanks Scott! It was a joint effort between a lot of people that led to this.
Thank you for this video🙏
thank for sharing your knowledge my friend, and that spreadsheet! Amazing. Thank you. Just wondering, you mentioned Museum Documents within this video. I searched but was unsuccessful in locating them. Where might they be found please?
Oh I found them, thank you, there was a PDF on your download page with that document. Legendary
And now I am wondering if this technique can be applied to balancing electric motor rotors and perhaps even internal combustion engine Crank Shafts, with simple equipment. Some guessing would be made in regard to Shaft Diameter, but the Vibrato-Meter (Balance Indicator from the Patent 00:56) would tell you where the harmonic peaks were.
And in regard to this, Matthias Wandel, genius RUclips woodworker, has a video where he balances a squirrel cage fan. He places a small speaker on each bearing and connects that to his oscilloscope. As the magnet shakes, microvolts are generated and he can see the peaks visually to measure vibration. Then he hangs a piece of copper around a fan blade. If it shakes more, he moves it to another blade till it shakes less.
I would consider introducing the air through a pipe to the turbine. I think the vibration app on phone is measuring vibration of the motor of the blower and also the nozzle kissing the casing.
Yeah fair point, would probably make the reading a bit more accurate. Also, the exhaust is blasting right at the phone, which I should've thought about.
@@Waveguide you can only improve these things from doing it and then analyzing afterwards. Are you going to try and balance at a higher sub-harmonic next?
@@nikola.tesla.r.and.d.centre yeah probably, just to get a further feel for the process, but I feel the rotor is already fairly balanced right now
@@Waveguide as you move into higher rpm territory that minor imbalance will become more apparent. At a guess your blower is less than a bar pressure. Using some silicon vacuum pipe you could drill a hole slightly smaller than the vacuum pipe and t-piece a vacuum / pressure gauge in so you can measure air pressure / back pressure
Insane
Very nice work, and the table is an awesome find, too. Question, where did you find the claim of 0.01 mm accuracy of the table? I was looking at various products and none stated accuracy, I may want to buy some of them.
Here: eur.vevor.com/rotary-table-c_10128/milling-machine-worktable-cross-slide-table-4-x7-3-compound-for-bench-drill-vise-p_010911031721
Not sure why an emery or abrasive cloth was not used to round out the wheel? Seems it would have balaced the disk more simply than all the calculations and the dremmel tool
Because I'm new to this haha
You are far ahead of me friend. I am enjoying your work. I have almost zero electrical experience but, I know there is more to motors and generators that others have been doing that is general public knowledge. You showed how a reed switch worked for one thing. Too many people just say, I used a reed switch or a circuit of some type, but they never break it down or even explain it for someone like myself who really has never touched a reed switch, let alone understands why they work or how to get them. So my suggestion was only meant as a humble observation. Keep up the good work.@@Waveguide