Jet Engine or Vacuum Pump?
ฝัง
- เผยแพร่เมื่อ 27 ก.ย. 2024
- In today's video, I want to show you the largest turbomolecular pump I've ever seen. It's a Pfeiffer TPH2101. The rotor of this pump weighs over 6 kg and has a diameter of 27 cm. A true monster of a turbomolecular pump!
Join my Patreon and support my projects! Your contribution means the world to me and helps bring my ideas to life. I truly appreciate your support! / advancedtinkering
I'm sorry, but dropping the nut into the rotor the second time absolutely killed me... 😂😂😂
I think it was on purpose because he likes the lovely melody
Couldn't stop laughing, felt like I was working on it
@@christiannorf1680 I swear it wasn't on purpose. But it did sound nice!
This is why you put a towel or cardboard on top to cover it off.
Wish my pump was this big
It's not the size that matters. It's even very exhausting to have to carry such a large device around.
@@AdvancedTinkeringit's not about the size, its about the sucking power!
:D
Better have more than one, so people can not call you one pump chump 😂
This is not just the largest turbomolecular pump I've ever seen, it is also the second one I've seen. My expectations have been thoroughly met. 😊
I'm glad you're not disappointed! ;)
same here, found this channel randomly through suggestions, and it's really interesting
It's excellent to put it on your tiny chamber! If the experiment fails and the system vents, the chamber will walk right over to you for maintenance!
That comment made me laugh quite a bit!
But yes, I would definitely think of some way to secure the chamber.
The thing with the concentric lands and grooves looks like a labyrinth seal. They're used in various axial compressors, like jet engines.
Ah, thank you very much! That was another guess of mine, but I didn't think that this type of seal works in a vacuum pump. And I had no idea what to call this type of seal. Thanks for the information!
@@AdvancedTinkering I second this. It doesn't look like the type of labyrinth seals that are meant to keep gasses and liquids out but the kind designed to keep small particulates (especially magnetic ones that might get created by what ever process is in the vacuum chamber) that might get into the very close tolerance gaps in the electric motor of the turbopump.
@@AdvancedTinkering I am not an expert, but I did recently read the Pfeiffer "Vacuum Technology Book Vol 2" for a project. It quickly mentions labyrinth seals in their turbopumps. I believe it is to create a flow restriction for sealing gas injected into the bearing/motor area if you use corrosive process gas. But it could also be to keep the oil from moving into the main body, the book is not 100% clear what it is ultimately used for. It certainly isn't a vacuum seal, that's for sure.
@@HuskyMachiningI concur.
@@AdvancedTinkering There is a youtube channel called AgentJayZ that has several years of videos covering jet engine maintenance.. He has mentioned labyrinth seals and probably has a video dedicated to them some place. The labyrinth seals for a jet engine are made of carbon to handle the high temperatures.
The labyrinth seals I have seen on his channel would prevent axial flow, while what you have I would guess is a radial seal.
You may not be an engineer but you're definitely a mechanic.
13:58 the difference between an engineer and mechanic
17:43 never makes the same mistake twice, just slight variations of the same mistake
19:47 The mechanic slap of approval
Agreed...
at this rate you can call your channel "the turbomolecular pump channel" love the content. These things are hecka instresting.
Thanks! The only problem is, that I really have to find some space to put those things.
@@AdvancedTinkering I know this problem all to well, I renovate old machines myself and both having to store them and use them come with some space hogging requirements.
electroboom started his channel with a video where he genuinely shocked himself, dropping the nut a second time is a+ material
The machining involved in making those vanes must be pretty incredible!
Looks pretty simple compared to any jwt engine tbh 😂
I'd assume 5 axis cnc
@@oliverer3 That, and wire EDM. Some pumps I've seen actually take a cheaper route for the stator vanes, they use stamped sheet metal instead with the vanes twisted to angle them.
@@imajeenyus42 parsons first steam turbine was pretty damn basic...
but other than improved machining techniques, not much has changed since then... had the maths down first go, basically. expansion ratios and blade pitches, areas, that sorta thing...
"I'm not taking this apart further"
(2 seconds later)
(grabs screwdriver)
"So this is apart now"
You just told the story of my life and personality.
Haha! I had to really hold myself back from also taking apart the base completely to understand how the ball bearing lubrication works.
I feel seen. Love this channel.
The engineering and machining levels on that pump are incredible, it's like military aviation level.
That sound from the intro will make any jet engine technician shiver in absolute horror. lol
It reminded me of the video by AgentJayZ.
You bring up an excellent point concerning the potential energy stored in a rotating mass. We had a failure of such a device (a GeneVac rotary evaporator) at work about twenty years ago and it was quite exciting. (The failure was entirely our fault, we overloaded the system with home-made sample cradles machined from solid blocks of metal rather than stamped from sheet.) Probably a similar amount of stored energy to your large pump (slower, but more rotating mass). The net result was a 2" (50 mm) steel shaft snapped, a 4" (100 mm) deep dent formed in the 1" (25 mm) thick aluminum case, the whole 250 pound (113 Kg) device did a 180 degree turn on the bench and jumped about a foot (300 mm) to one side, tearing out the 1" (25 mm) steel vacuum line that connected it to the vacuum pump (a liquid ring pump, quite a curious device in its own right). Also made a hell of a bang.
That is incredible! At first I marveled at your great memory. By the end, I realized that all the details would be emblazoned into my brain for the rest of my life, too.
sounds like you had the write the report
@@berrigo2 Fortunately not, but I was involved in the initial installation and operation and got to see the corpse while it was still warm. Even more fortunately, I was not involved in designing the modified cradles or approving their use. In the aftermath there was a fair bit of back and fourth with the manufacturer and it was their engineers who determined that our cradles overloaded their hangers which was what actually failed, allowing the cradle to contact the case at very high velocity and bringing the other 11 cradles and (132) samples to an abrupt halt.
@@robertlapointe4093 i wish i could get a coffee with and listen to you talk about crazy things like this
You have two, I think that means one on the top of the chamber and one on the bottom.
You have no idea how expensive those large flanges are -.-. Otherwise....
Excellent video!!! I just replace them. Never had the time to disassemble one. Thanks!
Thanks! I'm glad you liked the video!
I love the sounds it makes when you diassemble / reassemble it... it reminds me of Einstürzende Neubauten's "jet turbine".
I have to admit I laughed out loud when the nut fell in. Very relatable moment
I was so annoyed when it happened :D thankfully it came out without dissasembly.
Yup had the nut drop or screw drop too... and they are usually nonmagntic as well.😂
i'm 8 years into my job and still can't believe how often beer is seen as a totally legit form of "payment" between two companies
2 turbo pumps for a few cases of beer is one awsome trade. These were no doubt pm pulls but they would be easily good for hobby level deep vacuum experiments ❤
I want to see this pump spin some more! And I bet the sound is just as awesome as the spinning!
There will be a video with the pump reaching full rpm.
That must be some AMAZING beer you traded... 😂
Can you imagine the paperwork of a lab engineer selling used lab equipment with possible health and safety implications to a private individual? From a university or research department that is entrenched in complicated paperwork but not set up for actually selling items? Hours of work for several people including the meetings and paperwork... Alternative B: Nobody wants them, so the alternative is getting rid of them properly. Slightly fewer meetings and hours of paperwork, but now the cost is significant. The professionals receiving them will want to know every material that has ever been used even near the thing. "Take them off your hands for a case of beer"? You bet that is AMAZING beer!
The torque specifications of HNNG for big bolts and MMH for small bolts made my day
my grandfather always taught me the proper torque spec is "tighten until it snaps off and back off a quarter turn". perfect every time.
looks like 1 gutentite for the larger bolts.
For us Americans, that torture spec roughly translates to 4-5 Ugga duggas then about 2-3 ugga duggas
You Americans with your weird units. It's so much easier to calculate with nnnggghhhh than with Ugga Duggas.
What an amazing machine! I have to admit I laughed pretty hard when you dropped the nut into it a second time, thank you for including that bit!
I wish I could get a turbo molecular pump for a case of beer.
I have been working lately on Pfeiffer ATH 2303M pumps, they are stunningly massive, but I have not yet dropped a nut into them ;)
3/10, cannot recommend.
Sounds nice but it's a pain to get back out.
I sure am glad I never have problems like that nut falling in for a second time.🙂It must be so frustrating.
These pumps are frighteningly expensive, you're very lucky to get them for a case of beer.
This whole video was therapeutic 😁😍
I used to work at a potato chip factory. I don't know our power consumption in watts but we had two separate 3 phase 7200v feeds, and our power bill was around $250,000 per month. And the fryers were heated with natural gas!
Anyway, every time there was a loss of power for more than around half a second (30 cycles), all of the control equipment would reset. Our process was only certified sanitary under "steady state", so we'd have to dump all food currently in process, and get back to steady state. This cost around $30,000 of raw materials (so much more in lost revenue). During some times of year this could happen several times per day.
Given the short time horizon, and the massive power draws, management viewed it as an inherently unsolvable problem.
Well. I found a backup power solution that had carbon fiber disks in a vacuum chamber spinning at 500,000 RPM. They could come online within five cycles, and provide power for 15 seconds - which would cover 90% of our outages, but was also enough time to start diesel diesel generators kept in a "hot ready" state (coolant and oil kept at operating temperature with external heaters).
Anyway, based on historical power outage data, the flywheel system would pay for itself in 18 months just from raw material losses.
I tried for over a year to get my proposal accepted, and the fact that management wouldn't take it seriously was one of the main reasons I left the company.
This made me think of that story.
By "this" I mean you computing the energy of your spinning turbine.
I don't remember the size of the spinning disks, but given ½mv² and all that (I can't remember the formula for it spinning disk off the top of my head but you get the idea), the company had focused on rotational speed versus size. They found that these insane RPMs let them store a lot of energy for a short period of time.
Love the machining on these parts these have to be very expensive pieces of kit when they are new
I want to see how fast that thing can pump down your chamber! You could set it up to compare your other pump against this one.
I will do that!
thats very cool, but whats amazing is you bought it for beer ;-D
You know in your heart that the giant pump belongs on the top of your chamber; they belong together!
Beautifully done!
Thank you!
I used to work in helium leak detection. We would evacuate a small roughly 12 cu ft stainless steel bell jar with two large Stokes pumps to a certain vacuum level before we could expose the Turbo's to the vacuum level in the bell jar. If we exposed the turbos to atmosphere while running, the compressor blades would disintegrate from the inrush of air and from a soft startup at atmosphere level they would never ramp up to speed (70 to 75,000 rpm i think. it's been a long time ago.)so they ran all the time and were operated by a valve that opened them up when the bell jar reached the right vacuum level. I too opened one up one time. It never ran again.
Fyi. Torque specs are always based on the bolt, and material its going into. So you can look up m10 torque spec in aluminum and be pretty-alright.
That's such a valuable information! Thank you a lot! I knew that the material plays a role in the torque spec but I always thought it is also highly dependent on the use case.
@@AdvancedTinkering its really about the clamp load. For example an m8x1.25 torqued to its spec (31ft lbs) has nearly 6000lbs of clamping pressure.
So the total amount of clamp pressure required for a job is basically how many bolts you need for that specific task, and the torque rating is basically the max that the thread teeth themselves can handle with out being damaged. Thats why in aluminum will alsways be a bit less. Theres dry and wet torque specs too.. if you use a bit of oil, and then use dry torque specs you can and will start to snap bolts.
Some bit of extra fun... if youre making something with threads, your thread depth / material thickness only needs to be as thick as the nut for that thread would be to acheive full clamp load. (You dont ever need to tap something m8, 2" deep for "extra strength".. yes the teeth def wont strip, but the bolt will strech and snap instead)
Great chanel, we'd prob make good friends 😂 I should get back in the youtube game but try to be a bit less awkward about it lmao. You ask in some videos about your glass work and if you should leave clips in.. I think you should do a few vids on only glass work. How to make a hole, how to weld a joint, how to pre heat post heat, whole 9 yards... Theres lots of other "advance tinkerers" out there who might like to learn from you.. myself included. 👍🍻
As for your last idea, I support it. Having a big turbo pump is a luxury. If you had limited funds and built the setup with new components, absolutely not, but if you have a big pump available, definitely go for it. Source: We happened to randomly end up with a similar setup at the load/lock of one of our systems. Pumps down in no time, and when necessary we can open the gate valve and pump down the whole system quickly that way. Nobody is in a hurry to get back to a small turbo. 😆 The risk of unfortunate things happening when you mess with the turbo yourself is your own business in this case! Let us hope your energy calculation was not foreshadowing. 😇
I am working on it ;) but I doubt it will be a permanent setup. Since the pump must be mounted upside down, I would have to lift it every time I want to open the chamber 😅
Maybe in the future.
That is one *honking* big pump!
Turbomolecular pumps seem common these days, back when I was doing vacuum stuff back in the mid-70s, we used diffusion pumps for basic coating work, and molecular seive/ion/titanium sublimation pumps for ultra high vacuum. Turbos seem much simpler and higher-performance from a system perspective, I’m guessing turbos hadn’t been as well-developed at that time, so ion/TSP was a more effective combination in that period.
That is a fine piece of engineering.
These pumps are assembled in clean room conditions and very carefully.
Considering that rotational speed and diameter i think it is machined with insane nm tolerance, and such disassemble unfortunately disbalance rotor, even touching it by bare hand it deflect. I hope that magnetic bearing and hydrodynamic oil other side have some trickery to self balance for small deflection of main rotor.
@@AABB-px8lc I witnessed one that was cleaned professionally tear itself apart - $10K shot to hell - it was loud, but brief, but they replaced the unit. The tech probably nicked something while re-assembling. They never let us know what the cause was, but our MassSpec was down for nearly 2 weeks, right at the time we were doing our annual testing for the govt. I think it was an HP, but can't remember (30 years ago).
30,000RPM or so. I've had 14K RPM SCSI drives fail catastrophically as well, but it's more self-contained - the shrapnel didn't get through.
Dope content my friend❤ I imagine it must be very expansive piece of labgear
Thanks! I'm glad you like the videos!
Yes, those pumps are indeed very expensive. Without the generosity of their previous owner, I would never be able to show them to you guys.
Imagine if 'Manuals library' had a manual for one of these. 😊
I once knew a research group that managed to drop a nut into a pump at speed. The rotor was basically a solid at that speed, so the nut just bounced back into a remote section of the chamber. THE FIRST TIME! The next time, the pump injested the nut, blades, etc.
Almost as good as ripping into it myself
The ridged vanes you call "molecular drag stage" I believe to be a simple serpentine barrier between the motor/bearing & the working volume of the pump. Normally a small flow of purge gas is applied to the motor section to keep "krud" from getting into the motor/bearing.
Thank you for the information! Other comments agree and called it a labyrinth seal.
Thank you for the torque spec joke, 😊.
Hallo, hier der Pfeiffer Techniker,
hier mal ein bisschen Feedback zu deiner Demontage.
Magnetlager: Die Unterlegscheiben sind sehr wichtig für die Funktion der Pumpe. Sie werden zur Einstellung des Magnetlagers benutzt und kommen von unterschiedlichen Dicken (0,8mm - 2,0mm) in 0,05 mm abständen zum Einsatz. Sie werden bei jeder Montage neu gewählt damit das Magentlager die korrekte Position zum Rotor hat. Es kann sein, dadurch dass du die Fläche beschädigt hast (bei deiner demontage) der Abstand nicht mehr korrekt ist und du dadurch höhere Vibrationen in die Pumpe bekommst.
Rotor / Statorpaket: Der O-Ring ist ein Toleranzausgleich. Durch die vielen Distanzringe können sich Toleranzen der Ringe aufbauen, die das Gehäuse nicht ausgleichen kann und die Statorscheiben könnten nicht ausreichend gequetscht werden und auch hier Vibrationen erzeugen.
Ölkreislauf: hier liegst du komplett richtig mit deiner Annahme.
Labyrinthscheibe: Diese Scheibe zwischen Rotor und Gehäuse ist ein Gasschutz für den Motor. In dem Unterteil ist außen eine Schraube in der ein Schutzgas angeschlossen werden kann. Gerade wenn korrosive Gase gepumpt werden muss die Pumpe mit einen Schutzgas (z.B., Luft oder Argon) betrieben werden damit die korrosiven Gase durch den Druckunterschied nicht in den Motor kommen.
Schrauben: Ich weiß nicht wie oft mir schon diese schrauben in die Pumpe gefallen ist. Du bist nicht alleine!! Ich habe deinen Schmerz gefühlt, vor allem beim zweiten Mal.....
Wenn du weitere Fragen hast kannst du dich gerne melden.
And I though my EXT255H was oversized for my system. You win 🏆
I'm not even embarrassed to say I would try to make a small turbine motor out of them.
They just BEG to be franensteined into small turbojets!
damn that thing on is scary af
The concentric rings at the bottom of the rotor looks like a labyrinth seal in lieu of a shaft seal or o-ring.
That seems to be the consensus of the other comments too. Thanks!
That's an awesome sound, the sound of the pump ringing with the nut falling through it, twice! Just kidding, that's the expensive sound nobody wants to hear. I love the sound of it running at the end though, I'd love to hear it what it's like, installed in a setup.
The oiler makes me think of one-shot lube systems used on metalworking equipment. In those, the oil is lost rather than recirculating. I suspect the port you identified as for return oil is actually to equalize vacuum in the oiler so it doesn't have to work so hard. It probably injects a tiny amount of oil periodically - a small enough amount that it won't mess with anything downstream.
Interesting. Of course, that would also be possible.
How do these pumps stop air from flowing back into the chamber when the pressure gets very low
Oh this nice sound of the Blades and Vanes from a falling screw still makes me think "Oh F..."
I've worked in the Aviation industry on Turbofan Engines and once, i've had a screw lost in the compressor. That chimes were beatifull and horrifing at the same time.
I would not want to be in the same room when you filmed the last 10 seconds.
That shit is scary.
Oil pump systems do usually discharge high pressure through a smaller diameter path than the larger low pressure path. For reasons including thermal expansion, aeration, and deceleration while collecting in the reservoir to reduce frothing.
17:26 bwahahaha the xylophone of unemployment.
Holy shite you did it twice.
Thanks for that information! "Xylophone of unemployment" is the best term for it I've heard so far 😄
14:36 We called those _labyrinth seals_ in non-vacuum equipment.
Da mal benis reinhalten
Bildung mit dem Lorenz ;-D
Anyone else desperately want to turn that into a jet engine?
Well compressor section anyway...
I hope they have a video somewhere showing how these are made because that is an insane machine. I'd build a room sized chamber if I had one of those.
There must be some type of jig they use to remove and reinstall the magnetic bearings.
Oh definitely. I think there are quite a few special tools to service that pump.
The rotor also has a thread on the top. Presumably to easily lift it using a pulley or something similar.
part at 14:37 is called a "labyrinth seal".@@AdvancedTinkering
Thanks a lot for this information!
Good luck with the pump. They last a long time if maintained well. Do not vent fast, it does not like it.
Love to see pump down speed
There will be a video about that.
Are those rings near the winding a labyrinth seal?
Several people have commented this and I believe it is indeed the correct answer. Thank you very much!
Lucky you 2 pumps for a case of beer,... would have been nice to see if it would spin up with compressed air into the output, probably not or very slow, anyway great vid thanks.
I was just about to ask about the torque specs you were using and just like my torque spec, about one Ugg amazing videos and new sub as of the past week keep them coming
At 30k rpm, i wonder if the thing produces enough pull force to suck in your hand, like a mini airplane engine (yes i know it doesn't actually pull air in)
If you somehow had a bigger outlet port it certainly would. Otherwise it would have enough back pressure and heating that it would spectacularly disassemble itself. Seen one fail like that and it is scary AF😮
14:30 It's a dust trap I would say. The “up and down labyrinth” makes it more difficult for dust to get towards the bearing block
21:00 Same picture as mine yesterday. Only my pump is a little smaller. TMH521 with DN160.
13:10 I would like to see a turbo crash at top speed in slow motion. The kenetic energy must be incredible. We had a TPH2200 that suffered damage at high speed and fell apart into countless pieces
Yes but will it blend?
I'm pretty sure it will. Once....
Do the drive electronics have some kind of braking included? I would think left on its own, the pump might spin for several days before it finally stops.
There is no kind of breaking system that I know of. You can use the vent valve to slowly bleed in air to slow down the pump faster.
We've done a lot of these impellers
In the US we say the torque spec is "until it clicks, then back a quarter turn"
it's also a joke
How much would one of these pumps cost new? Specialized equipment is never cheap :)
I can't say for sure because Pfeiffer does not sell this model anymore. You can find them used for a few thousand up to 14k. Fully refurbished ones go for 30k. So I would guess somewhere around 30k.
The problem with very expensive and specialized equipment is, that there is no market for it. No privat person needs such a pump and in my experience the industry does not want to risk buying used equipment and has the money to buy new ones anyways.
I think that amount of tourqe is referred to as "German standard torque" a.k.a. "Gut'nTight" 😉
Exactly ;)
Last I heard that was in one of AvEs videos if I remember correctly.
@@AdvancedTinkeringI love it when he says it werks in german
I want to see that!
Check out my newest video ;)
Would be nice to see a DIY repair on a rotary vane vaccum pump. I have an Edward's E2M5 rotary vane pump which was left on the shelf for years. There is rust inside which I cleaned with the help of electrolysis and I sanded the surfaces just a little bit with 2000 grid sand paper. Changed all seals an filled up with new (cheap) vaccum pump oil. Now I may need to change the vanes because it goes down to only around 200 microns. Is it possible to build those vanes at home from the stock material? The material could be HGW2082 (PF CC 201).
Ah yes, the terrible sound you never want to hear when working on -turbine engines- turbomolecular pumps
The "moacular drag Stage " Looks Like a Labyrinth Seal to me. And the orings ON the stator Rings are probably to forcenthe airflow through the Rotor stator (efficiency).
I've got one that weighs 80KG, but I need help restoring it lol
Something like this may be at the output of a Bussard Collector before collecting hydrogen for extra fuel rather than bouncing it away.
Ahhh das gute Bayreuther!
Yes, this is the internet. Figured this video might have 100 views, after-all who would be interested in a TM pump other than a nerd like me. Well, apparently I do not nerd alone....
MOUNT THE PUMP ON THE BOTTOM! 😂 that would be an amazing chamber, build a protective screen in the bottom over the pump, you could properly make it fairly fine mesh as the loss in performance wouldn't really matter 😂 sure you'd have to do all your experiments trough the top but I think that will be manageable. Or just make an adaptor to one of the side flanges 😅
I would love to 😄. But the pump can't be mounted at the bottom or it will break. It needs to be upside down or on its side. But I will for sure mount it at the top and try it at least once!
@@AdvancedTinkering Top mounting is better from the standpoint of crap falling into the pump and destroying it.
Actually the screen out of large CRT picture tubes works very well as an intake screen because the slots cut in it are directional. Tbh this isn't much of an issue, if the chamber loses vacuum bad enough to stir up debris it is over anyway.😂
A torque of unf
And a torque of euh
Dying 😂
I think the bottom bearing is also just a crash bearing and in normal operation the conical element will be a hydrodynamic bearing. i think you should care about it in the assambling process
This is a very interesting theory. However, I have never heard of a turbomolecular pump with hydrostatic bearings. And I doubt that the small hole in the part where the conical nut sits is sufficient to generate uniform oil pressure.
08:20 ... or radioactive dust! Maybe it was used in a radioactive waste recycling factory. Better check... .
Your estimation for rotational energy would be way way off as the bulk of the mass is closer to the axis. A better estimation would be to neglect the diameter of the blades all together. Or at least, get a fictive diameter from the weight and the density of steel
That was a joke at the end, right?
Of course we want to see you mount it on that chamber. 0-high vac in about 20 seconds. Start it at ambient and watch your backing pump generate electricity. :)
So that torque spec was what, about 150 milli Advanced Tinkerings?
I am working on it ;)
Where did u get them from? When u said Switzerland I immediatley thought they might come from CERN or someplace like that. I can imagine CERN using pumps of this size for the vacuum systems of their totally enormous particle accelerators like SPS and LHC.
I unfortunately can't tell you were I got them from. But definitely not CERN. But of course I would not mind getting equipment from them :D.
CERN's equipment would likely be much cleaner than that, but accelerator rings need significantly better vacuum than turbos alone can get you. We're talking in the 10e-11 or 10e-12 range to have a long enough mean free path. Turbos to rough it down, but they'll be using cryos and probably a whole lot of ion pumps.
What type of motor does the pump use?
Nice to see you carrying international currency in your vehicle…..
BEER 😂😂
Mate, where can I buy huge turbos for beer? 😂 Hit me up. I'm already in Switzerland and always got beer 😅
Great video, I've two (3) questions, how those rotor blades are made? are they machined from a single piece of metal? what is the material? (stainless steel, aluminium,...!)
Thanks! Yes, each stage of the rotor is machined from a single piece of metal. They than are placed on the shaft using a shrink fit.
I honestly can't tell you for certain what the material is. As far as I know it's a special aluminum alloy.
@@AdvancedTinkering Thanks, keep up the good work.
I didnt hear you mention or see you mark parts you removed as to exactly the position they came out. On an unknown machine of such close tolerances, removing an end plate or cover that looks likee it can go back on 4 different ways, without a correcponding mark on each mating position, could end up introducing a problem the original fitter avoided.
Were all the stator vanes snd rings all kept in the same ordervand same side and face when assembled, and tracking during cleaning in bath? If not, and there was interference after assembly, there would be no starting point to toubleshoot..
I would have, but some say i worry too much. I would hate to break something so beautifully made. Its good you have 2 of them.
Hello, what for do you use aluminum foil on your desk?
If your wondering about the torque specification, the larger one have a torque of approximately; uuuumph 😂😂
While such a system may be overkill, would it provide the CFM needed to supply an ICE, ie small car engine?
I've been interested in the vacuum sublimation of Ammonium Perchlorate, aka rocket fuel. But this requires the gases to be transferred under vacuum.
F1/Indy cars are not 60% efficient, they hide the AP in the liminal space of the engine. It's also mixed w/ a fuel, such as silicon. The exothermic energy release of Si+N is on the order of 40x that of H+O2. NASCAR crew chiefs have been using AP, as a cheat, for decades. Problems arise during caution, as the higher vacuum provides more fuel. Example being Montoya hitting the track's jet dryer, at a Daytona night race. Footage from the left rear can no longer be found on UT, as the glowing rear brakes give away the 'secret'.
14:37 it's a labyrinth seal
That iridescent film - I'm not 100% sure that's from metal oxides (it certainly could be). I suspect they could be from accumulated polymers i.e. from deliberately or inadvertently etching photoresist... I've seen this film all over plasma etch chamber wall & components many many times, especially with many hours between PMs (obviously when performing PMs, they have max hours before cleaning that residue off is required).
You can test that by getting it wet with DI water or 10/90 IPA
BUT YOU DON'T WANT TO BREATHE THE GAS THAT MAY BE PRODUCED.
Water often reacts with those polymers and makes them come off much more easily, but the VOCs released obviously should not be inhaled.
Interesting, I didn't know that. But I cleaned the rotor with water and IPA and didn't observe any reaction so I think the colors are caused by metal oxides.