I help design a lot of industrial piping, and this overview really short-circuited the learning curve on standard vacuum components for me. Thank you very much.
Scroll pumps come in handy, you don’t have to worry about back streaming. Also, with an isolation valve between the chamber snd the turbo, you don’t have to worry as much about “dumping” the turbo and you can leave it on. Great video!
Thank you very much for making this! Great to hear an educational video from someone who is also learning this. You kind of get the perspective of 'the new guy'. Invaluable.
That chamber looks so "mad scientist" awesome - was this a surplus find? What did it cost? Guessing a tiny fraction of what it did originally. How do you go about finding the tiny leaks that limit the vacuum?
haha thanks. This chamber was probably about $60k new, I got it for a small fraction of that. And then I had to get all of the gauges and pumps and other accessories. One way of finding leaks is a helium leak test. 2:50 ruclips.net/video/DZGTh3hGzNc/видео.html
Thank you for sharing your knowledge with us. I've been working with E-Beams for a couple of years and high vacuum is the main thing in these machines. Gasckets, flanges, and pumps are very familiar to me. Very interesting and complicated field..
E beam welder here, surprising how little "cleanliness" went into the machines we worked on. Would have puddles of oil from the coating on the metal strips, fingerprints, wobbly gaskets, and more and the high vacuum would still work great. Of course the chamber and pump size was proportioned quite differently so just brute force pumping all that stuff out of there.
We found scroll pumps much more reliable than membrane pumps over years scale. This was important to not pump air in case of a rupture in the membrane pump, for helium recovery.
Awesome job :) The only feedback I can think of is, because it's such a complicated subject, it would be interesting to see a simplified path from start to finished chamber, eg; what approach you would take knowing what you know now if you were to start from scratch, pitfalls to avoid, etc - some of that you covered really well already, but it can be hard to piece it all together into a plan when you're new to the subject
Do you have a recommendation by now for such a "tutorial"? I am currently in need of one since I know nothing about this topic, but have to find something rather quickly..
We need to be friends. Hopefully getting a job soon where I can start affording that stuff. Got myself a diffusion pump and a box on conflats the other week along with calibrated HVDC source 🙌 excitedly looking forward to a few more of your vids 😅🙏
I want to build vacuum tubes (electron tube, nixie tube, etc.), achieving high vacuum is the most difficult part. Thanks for this fantastic video that allows me to have a detailed view of vacuum knowledges!
Excellent intro to a wicked niche hardware topic! The only bit that is remotely familiar to me are the copper washers, they're used in car brake lines. Now I wanna go look up how these pumps work lol. Usually think of a "turbopump" as a heavy mover application, like say rocket fuel.
O.o WOW... ...this assembly must have cost what...50-100k ?! Some of the stuff - especially the TMP - is super-rare unobtainium if one isn't backed by research institutions! I am amazed and a tad jealous ^^ Subbed.
What's a suitable pump for long term use hydration of waste vegetable oil in an old LPG gas bottle, for home processing to get water out of the veg oil?
Great video. Quick question - Why do you initially evacuate the main chamber through a separate line rather than through the stopped turbo? I understand the turbo can't run in atmosphere but I believe they are pretty much a direct pass-through when not running? Thanks
Good question, this would work but is generally frowned upon because it will cause the turbo to freewheel and spin up while not under power. Good to pump it down first through another line.
I think it is a matter of the volume to be pumped. We have them in series. and the turbo has to accelerate anyway. But our volumes are small, in the order of a few liters. The turbo is driven with a few amps to start with, and revs up with decreasing pressure. The vacuum can also be seen at the pump current, which decreases with decreasing pressure. When the drive current stays too high a bearing replacement is due.
I have got another idea on how to make ultra high vacuum pump: - Make a cylinder out of metal (the crankcase) - Make a cylinder that fits that cylinder with a 1 micron space (the piston) - The shape of the inside cylinder must be bumpy towards the center, so plastic would adhere to it - Fill the (1 micron) gap between two cylinders with nylon 66 , it is a naturally lubricated plastic compound - Using a good amount of force, remove the internal metal cylinder , the nylon 66 would un-stick from the outer cylinder and you would get a piston that will fit the crankcase with no free space between them, it would be atomically fit, it wouldn't be 1 atom fit, it would be practically 0-atom thick with no possibility for other matter to pass between. You could probably make a nylon 66 coating on the crankcase too (and do this inside a nitrogen jail to avoid oxidation of metal) , this way you would have nylon 66 coating on both, the piston and the crankcase, because otherwise the oxide on the metal might not be a good to support the force generated by the vacuum. Must work a lot better than an o-ring.
to make absolute vacuum you just need to cut any material with x-ray laser . X ray laser of say 20-30 picometers (wavelength). So you shoot this laser through the material in a circle shape, exactly one atom of material will be evaporated, this way you will create the piston for the pump. Then you just pull this piece of material and you have got vacuum , no valves or any kind of this stuff is needed. Picometer positioning is already achieved using interferometers, I have seen it here on RUclips the CNC routers of that precision (SmarAct GmbH , for curious). So, absolute vacuum is not science fiction anymore.
It's really useful, Thank you so much ☺. I would like to see more on upc, throttle valve and general mass flow controller used in chamber process. If possible please upload the same.
to avoid backstreaming from mechanical pump, it would be a good idea to cool down to a low temperature (say 1 C) the output of mechanical pump, so the atomized oil can be liquid again preventing the oil to enter the chamber vacuum?
Well done little tutorial, watch out for that NPT thermocouple gauge idk how well itll hold up in high vac...have you leak checked the NPT? Id be interested to see what your main leak points are, wouldnt be surprised if that is one. Can't wait to see what cool experiments come out of this (definitely a bit overkill for just thermal evap coating no?), keep at it!
@@yhlei5856 thanks, I’ve since done a lot of research since I first asked this question. It boils down to what the process is, what the absolute vacuum level needed is. Then chamber material, gasket material, gasket type, vaccum pump type, what vacuum system and throttling. And much more. Thanks for the responses
The material being deposited should not contaminate or even react with the remaining gaz atoms, nor would you want to include too much gaz atoms into your layering. The less deposits, doping, are allowed, the lower the pressure has to be.
Do you practice torquing down the bolts and to specs ? Once done o rings are introduce to heat then it’s best to replace them . Our -8o o rings are about 25o $
Hello Sam ! first thanks for your video its very appreciated quality stuff :) Hope to see more content from you ! Here quick question, how would you consider the overkillness of your vacuum chamber considering the needs to make IC ? And the quality of it depending the quality of the vacuum chamber ? this part seems by far most expensive and inaccessible to make home IC, so im wondering if Its possible to cut it down a bit. Thanks !
Why isn't the turbo pump just attached directly on the side. The right angle pipe would increase the chance a particle would be rejected bouncing through that port, right?
Turbo pumps have to operate with the axis vertical. The bearings are made for 90'000 rpm (1500Hz) and one of the bearings is magnetic, while the other is a ball bearing.
Is this how you will dope the semiconductors? You will need boron or arsenic coated surface on ends of electrodes in the vacuum, with high voltage to create the plasma, then an additional strong magnetic field (voltages) to propel the boron/arsenic plasmas into the silicon substrate which has been masked and etched as seen earlier in vids? Or as you said you will do it simply by spinning on some how? Then use this to deposit aluminum or what ever metal for the traces to connect the muskets or transistors?
Also for mem's inertial sensor I wonder how to create a suspended lever which can deflect changing capacitance? Maybe silicon oxide layer growth, then silicon deposition or crystal growth and then etching of the silicon oxide layer beneath?
+marshalcraft the process you describe is ion implantation. This is near impossible to do in a home garage. I do my doping with diffusion of phosphorus or boron containing spin on glass layers. I mention this in my semiconductor fab basics video
Given that this video was posted in 2017 this suggestion may come too late, but the manufacturers of the pumps that I deal with recommend that you vent through the venting valve on the side of the turbo in order to maximize its lifetime. Apparently that's where they are designed to have gas enter them. Also, while it's tempting to vent slowly, they should spin down relatively quickly so they don't spend too much time operating at any resonant frequencies of the pump. Another thing I would suggest if you want to reach good UHV conditions is not mounting the turbo around a bend like that if you have the correct adapter. I'm not sure why it's like this. Is this model of pump supposed to be operated horizontally or something? Very cool stuff. And please let me know where an ordinary person can afford this equipment without a research grant. I've been going to the wrong garage sales.
+Brian Climbs thanks for the suggestions, mine has a vent valve and I usually flow gas into the chamber via mass flow controller to spin it down faster. I get almost everything from eBay or dumpster dives at high tech companies basically
I was genuinely surprised to learn that you are supposed to vent into the middle of the pump blades. I was initially concerned about the seemingly aggressive spin down and the possibility of back-flowing. Man, I wish there was some kind of hackspace or indie lab that had this kind of equipment! @@SamZeloof
Hi, may I ask you? where did you get the main body of the chamber? or you made it? and if so, how? many thanks for any reccomendation! ..I want to build my own chamber much smaller than yours, just a simple chamber
Yes, the bearing. The rotor is quite heavy, and it runs at 1500Hz, equivalent to 90'000 rpm. One bearing is magnetic, while the other is a ball bearing.
+Alvaro Rodriguez eBay eBay eBay that's basically all you can do, and all I did. Also make connections and talk to people, you'll start to realize your friends friends have vacuum chamber parts they are willing to give you
¿Have you considered manufacturing your own parts? Im thinking wether to buy a small chinese-ish cnc, or build myself and electric oven, a press and sinter. Not too sure if sintered parts will cut it for vacuum, even if the have a 100% fill.
check out this guy's build, luciano jorge ritchie, for doing telescope mirrors for ideas: ruclips.net/video/75AoWl3jhcQ/видео.html. I don't know what you want to do but he shows how you can make a high vacuum system for not that much money.
That is a fantastic chamber! I am building a vacuum chamber and I want to add a gauge, I was thinking of buying a MKS 901p transducer, though I am not familiar with the analog output. How would I measure the pressure indicated by the analog output? Do I need an arduino, voltmeter, or what? As far as programming goes, I know how to use python, so yeah, I am quite a newbie at this...
+plls12 analog output means it will give you an analog voltage usually between 0 and 10 volts proportional to the pressure. You can just use a voltmeter
OK..... I'm Just 2 years late, but here it goes... put like a crab claw or any other exoskeleton and deposit metal on it, maybe marine exoskeleton would react different from insects
I'll just buy some diffusion pumps off ebay I said. I'll figure out a way to make a cheap vacuum chamber for sputtering I said... Oh boy the rabbit hole I'm diving into.
Why do you need those valves, can't you just pump through the turbopump directly as it will pass everything feely anyway when not running and only later when main pump cannot suck anymore you tun it on
I think I read that you can but it has some disadvantages, like lower roughing speed to get the chamber initially down to low pressure. Maybe some other problems too but I can't find the reference right now.
@@perspectivex I do not see any logical explanation for those issues, because turbopump is essentially just a plain tube with some turbines, and it practically does not interfere with airflow while adding extra valves and extra plumbing will definitely increase leaks and vacuum chamber volume increasing evacuation time that way. I could assume some safety issues because if you let air in quickly you can damage the pump but this can be solved in other ways.
@@deltaxcd No idea... I'm starting out with vacuum systems and just relaying what I was pretty sure I read so you'd have to Google it to see if you can confirm. Just because it's not obviously logical doesn't mean there's not some perhaps more obscure reason for it. Also I see now that Sam replied to Matthew Beardmore in the comments below about this, saying: "generally frowned upon because it will cause the turbo to freewheel and spin up".
@@perspectivex I never noticed any information about that either so it is hard to tell if this is some kind of stupidity or something important. and I am also just starting with the vacuum but in a less expensive way. the fact that it will cause turbopump to spin um is nothing to care about either I suspect that this can be a mistake copied from ion pumps because if instead of turbopump you use ion/getter pump it is absolutely required to use this kind of system
Sam Zeloof I'm shooting for a vac in the -6 to -10 range and I'm losing the battle, I have some kf connections that I cant get rid of (sensors and the connections to my roughing and backing pumps) do you have any pointers on how to get the best seal from KF? I have stopped clamping down super tight and I'm using new rings every time I reconnect flanges, I perfectly clean with acetone and dry. Is there something I'm missing or am I expecting too much performance from these seals? Does it matter if I use buna, silicone or FMK? Thanks for the video BWT great info
my question from a total beotian why dont you use more welding, why to use windows. we have very small cameras they could be put inside and just a USB 3 connector must be embedded this connector can take the maby cameras+ all the probe inside+ small robotics hands control . From outside it will not be very glamour but it could be much cheaper please tell me what is the point I missed ?
@@SamZeloof I think he's saying put cameras and other equipment inside and make the chamber basically without ports so it'd be cheaper, just small holes to feed cables in that are sealed somehow. But I guess the outgassing from all the stuff inside would negate getting to high vacuum and introduce lots of contaminants.
Hey Sam, Great to see a video on this equipment. I am a Vacuum Specialist with 25 years in the industry, I run a Company in the UK. Please feel free to get in touch if you have any questions. We would be happy to help. Check us out on www.evapsolutions.co.uk
Get rid of the acetone residue? Are you freaking serious? If the acetone has some non-evaporating stuff in it, then who's to say that the same thing isnt true for the isopropyl alcohol mixture? If you're that worried about non-evaporating stuff in acetone, you should distill your acetone instead of using isopropyl alcohol later on
I help design a lot of industrial piping, and this overview really short-circuited the learning curve on standard vacuum components for me. Thank you very much.
+joshmnky glad to help!
I'm gonna put one of these in my bedroom right by the window so my neighbors are always on their toes wondering what I'm doing.
Scroll pumps come in handy, you don’t have to worry about back streaming. Also, with an isolation valve between the chamber snd the turbo, you don’t have to worry as much about “dumping” the turbo and you can leave it on. Great video!
Thank you very much for making this! Great to hear an educational video from someone who is also learning this. You kind of get the perspective of 'the new guy'. Invaluable.
Your channel is absolutely fantastic man! Can't wait to see more great videos from you
thanks!
i worked at Vacgen for 25 years 20 years making flanges 4 1/2 to 16" must have made thousands 304 and 316
i could make them in my sleep
Thanks a lot for the detailed vacuum chamber basics. I am new to semiconductor chip making industry, and needed such overview video.
That chamber looks so "mad scientist" awesome - was this a surplus find? What did it cost? Guessing a tiny fraction of what it did originally.
How do you go about finding the tiny leaks that limit the vacuum?
haha thanks. This chamber was probably about $60k new, I got it for a small fraction of that. And then I had to get all of the gauges and pumps and other accessories. One way of finding leaks is a helium leak test.
2:50 ruclips.net/video/DZGTh3hGzNc/видео.html
But how much exactly dude?
@@ralfiasz id assume 2 to 3 thousand just for the chamber if it were used
Thank you for sharing your knowledge with us. I've been working with E-Beams for a couple of years and high vacuum is the main thing in these machines. Gasckets, flanges, and pumps are very familiar to me. Very interesting and complicated field..
E beam welder here, surprising how little "cleanliness" went into the machines we worked on. Would have puddles of oil from the coating on the metal strips, fingerprints, wobbly gaskets, and more and the high vacuum would still work great. Of course the chamber and pump size was proportioned quite differently so just brute force pumping all that stuff out of there.
We found scroll pumps much more reliable than membrane pumps over years scale. This was important to not pump air in case of a rupture in the membrane pump, for helium recovery.
Great job introducing high vacuum machinery & basics!
Very few channels show us nanotechnology equipment! Great work man!
Awesome job :)
The only feedback I can think of is, because it's such a complicated subject, it would be interesting to see a simplified path from start to finished chamber, eg; what approach you would take knowing what you know now if you were to start from scratch, pitfalls to avoid, etc - some of that you covered really well already, but it can be hard to piece it all together into a plan when you're new to the subject
Do you have a recommendation by now for such a "tutorial"? I am currently in need of one since I know nothing about this topic, but have to find something rather quickly..
Repress with N2 and when not using chamber keep it at < 400 torr. That will help with water vapor. Ideal vac sells tc kf gauges.
Nice!! I am starting to build a vacuum chamber. It is good to know this terminology thing in vacuum field. Thanks!!
I am about to set up three vacuum chambers, and this was a great overview; thanks!
Hi siddhant could you provide your contact ..if you are from India
i would like to talk to you to understand on the Vaccum chamber
@@stalwardstallion I'm actually at Purdue (Indiana). But we can do a zoom if you send me your email.
@@boyastro100 stalwardstallion@gmail.com,thank you
Great tutorial! If you do more of these in the future, please consider using whiteboard sketches to illustrate the flow paths.
I'm about to build a vacuum chamber so this was a big help for me.
And just where do you get the money to buy all of this the view port alone can run you $280
Man i loved that video. i just got an Edwards ST-301 turbo molecular pump and controller. So very glad to see this most informative video. Thank you.
We need to be friends. Hopefully getting a job soon where I can start affording that stuff. Got myself a diffusion pump and a box on conflats the other week along with calibrated HVDC source 🙌 excitedly looking forward to a few more of your vids 😅🙏
Nailed it. Is this just a hobby? You're hired!
I want to build vacuum tubes (electron tube, nixie tube, etc.), achieving high vacuum is the most difficult part. Thanks for this fantastic video that allows me to have a detailed view of vacuum knowledges!
I guess you saw tubecrafter.com/index.html.
Is that an accelerator tube you wanna build? Sorry it was long back. Hope you already succeed
Great video, very useful, thanks! Stupid (?) question: I don't see too many KF10 clamps -- are KF16 clamps compatible with KF10 flanges?
Is there a reason you use the tapered down conical KF for turbo pump or is it just for dimension purposes.
Excellent intro to a wicked niche hardware topic!
The only bit that is remotely familiar to me are the copper washers, they're used in car brake lines. Now I wanna go look up how these pumps work lol. Usually think of a "turbopump" as a heavy mover application, like say rocket fuel.
thanks! this vacuum stuff is a lot of fun.
O.o WOW...
...this assembly must have cost what...50-100k ?!
Some of the stuff - especially the TMP - is super-rare unobtainium if one isn't backed by research institutions!
I am amazed and a tad jealous ^^
Subbed.
Turbopumps are actually suprisingly cheap, often under 500€.
Used....
What's a suitable pump for long term use hydration of waste vegetable oil in an old LPG gas bottle, for home processing to get water out of the veg oil?
Great video. Quick question - Why do you initially evacuate the main chamber through a separate line rather than through the stopped turbo? I understand the turbo can't run in atmosphere but I believe they are pretty much a direct pass-through when not running? Thanks
Good question, this would work but is generally frowned upon because it will cause the turbo to freewheel and spin up while not under power. Good to pump it down first through another line.
I think it is a matter of the volume to be pumped. We have them in series. and the turbo has to accelerate anyway. But our volumes are small, in the order of a few liters. The turbo is driven with a few amps to start with, and revs up with decreasing pressure. The vacuum can also be seen at the pump current, which decreases with decreasing pressure. When the drive current stays too high a bearing replacement is due.
Thank you for the video! It is impressive work! How did you learn to do all that?
what high voltage plazma type experiment can be done in ultra high vacuum chamber ????
What is the highest vacuum you can get from it ???
I have got another idea on how to make ultra high vacuum pump:
- Make a cylinder out of metal (the crankcase)
- Make a cylinder that fits that cylinder with a 1 micron space (the piston)
- The shape of the inside cylinder must be bumpy towards the center, so plastic would adhere to it
- Fill the (1 micron) gap between two cylinders with nylon 66 , it is a naturally lubricated plastic compound
- Using a good amount of force, remove the internal metal cylinder , the nylon 66 would un-stick from the outer cylinder and you would get a piston that will fit the crankcase with no free space between them, it would be atomically fit, it wouldn't be 1 atom fit, it would be practically 0-atom thick with no possibility for other matter to pass between. You could probably make a nylon 66 coating on the crankcase too (and do this inside a nitrogen jail to avoid oxidation of metal) , this way you would have nylon 66 coating on both, the piston and the crankcase, because otherwise the oxide on the metal might not be a good to support the force generated by the vacuum. Must work a lot better than an o-ring.
to make absolute vacuum you just need to cut any material with x-ray laser . X ray laser of say 20-30 picometers (wavelength). So you shoot this laser through the material in a circle shape, exactly one atom of material will be evaporated, this way you will create the piston for the pump. Then you just pull this piece of material and you have got vacuum , no valves or any kind of this stuff is needed. Picometer positioning is already achieved using interferometers, I have seen it here on RUclips the CNC routers of that precision (SmarAct GmbH , for curious). So, absolute vacuum is not science fiction anymore.
how do the turbo pumps work? what kind of engines do they use, how fast do they spin, how do they provide sealing?
For more info visit google.com
a 3 phase rotating field, If you get a permanent magnet balanced it would be a BLDC otherwise an asynchronous motor onto whatever surface
It's really useful, Thank you so much ☺. I would like to see more on upc, throttle valve and general mass flow controller used in chamber process. If possible please upload the same.
to avoid backstreaming from mechanical pump, it would be a good idea to cool down to a low temperature (say 1 C) the output of mechanical pump, so the atomized oil can be liquid again preventing the oil to enter the chamber vacuum?
It is a good idea. Maybe we can install an oil mist filter to avoid the situation.
Well done little tutorial, watch out for that NPT thermocouple gauge idk how well itll hold up in high vac...have you leak checked the NPT? Id be interested to see what your main leak points are, wouldnt be surprised if that is one. Can't wait to see what cool experiments come out of this (definitely a bit overkill for just thermal evap coating no?), keep at it!
How do those VCR gasketed pipe joins compare to yor-lok fittings? Both bite metal to metal
16:33 this is exactly what happened and I thank you for that.
I make all its mechanical parts . Can you tell me how career growth can happen in this?
@ Sam Zeloof what would be the best vacuum pump configuration for PECVD deposition?
this is a good question. In general, the type of pump you config depends on the size of your chamber and the vacuum level required.
@@yhlei5856 thanks, I’ve since done a lot of research since I first asked this question. It boils down to what the process is, what the absolute vacuum level needed is. Then chamber material, gasket material, gasket type, vaccum pump type, what vacuum system and throttling. And much more. Thanks for the responses
The material being deposited should not contaminate or even react with the remaining gaz atoms, nor would you want to include too much gaz atoms into your layering. The less deposits, doping, are allowed, the lower the pressure has to be.
Why does the chamber look so overbuilt? Is the vacuum that strong?
How did you afford all this? What do you work with? That must be e few hundreds of thousand dollars!
Do you practice torquing down the bolts and to specs ? Once done o rings are introduce to heat then it’s best to replace them . Our -8o o rings are about 25o $
O-rings must not be exposed to heat. Some are specified for 100 degrees, while others are for 180 degrees, but I wouldn't operate them with vacuum.
Hello Sam ! first thanks for your video its very appreciated quality stuff :) Hope to see more content from you ! Here quick question, how would you consider the overkillness of your vacuum chamber considering the needs to make IC ? And the quality of it depending the quality of the vacuum chamber ? this part seems by far most expensive and inaccessible to make home IC, so im wondering if Its possible to cut it down a bit. Thanks !
You forgot to add gate valve to protect your turbo pump from sudden leakage
He will acquire one along the way. I think he is experimenting with a setup at the moment. Gate valve is highly critical though.
when will you be able to build a compact machine like a 3d printer that can print any silicon ship by feeding some wafers into it?
Why isn't the turbo pump just attached directly on the side. The right angle pipe would increase the chance a particle would be rejected bouncing through that port, right?
Turbo pumps have to operate with the axis vertical. The bearings are made for 90'000 rpm (1500Hz) and one of the bearings is magnetic, while the other is a ball bearing.
sweet system. i dont know much about this subject but your turbo facing upwards like that gave me anxiety. i can picture something falling into it
can you make high vacuum pump from 40 pvc tubes?
Comes the full vacuum into your hot cathode ionisation gauge? I mean holds the gals body the pressure from the high vacuum?
Where you get all this component
Is this how you will dope the semiconductors? You will need boron or arsenic coated surface on ends of electrodes in the vacuum, with high voltage to create the plasma, then an additional strong magnetic field (voltages) to propel the boron/arsenic plasmas into the silicon substrate which has been masked and etched as seen earlier in vids? Or as you said you will do it simply by spinning on some how? Then use this to deposit aluminum or what ever metal for the traces to connect the muskets or transistors?
Also for mem's inertial sensor I wonder how to create a suspended lever which can deflect changing capacitance? Maybe silicon oxide layer growth, then silicon deposition or crystal growth and then etching of the silicon oxide layer beneath?
+marshalcraft the process you describe is ion implantation. This is near impossible to do in a home garage. I do my doping with diffusion of phosphorus or boron containing spin on glass layers. I mention this in my semiconductor fab basics video
+marshalcraft there are plenty of techniques for creating free standing mems structures.
I see.
Given that this video was posted in 2017 this suggestion may come too late, but the manufacturers of the pumps that I deal with recommend that you vent through the venting valve on the side of the turbo in order to maximize its lifetime. Apparently that's where they are designed to have gas enter them. Also, while it's tempting to vent slowly, they should spin down relatively quickly so they don't spend too much time operating at any resonant frequencies of the pump.
Another thing I would suggest if you want to reach good UHV conditions is not mounting the turbo around a bend like that if you have the correct adapter. I'm not sure why it's like this. Is this model of pump supposed to be operated horizontally or something?
Very cool stuff. And please let me know where an ordinary person can afford this equipment without a research grant. I've been going to the wrong garage sales.
+Brian Climbs thanks for the suggestions, mine has a vent valve and I usually flow gas into the chamber via mass flow controller to spin it down faster. I get almost everything from eBay or dumpster dives at high tech companies basically
I was genuinely surprised to learn that you are supposed to vent into the middle of the pump blades. I was initially concerned about the seemingly aggressive spin down and the possibility of back-flowing.
Man, I wish there was some kind of hackspace or indie lab that had this kind of equipment! @@SamZeloof
thanks so much for sharing! awesome video!
So what do you do with it?
With equipment that expensive you could justify buying a mill to make your own.
Hi, may I ask you? where did you get the main body of the chamber? or you made it? and if so, how? many thanks for any reccomendation! ..I want to build my own chamber much smaller than yours, just a simple chamber
Thank you so much for this video!
Thanks, interesting and informative.
Dude how did you get ahold of all of this stuff.
What the cuss do you need this vacuum for?
+The Plane Truth please watch your language there are children
Ni vcr gaskets are good also
What's your job role ?
You should do fusion
Hi Can you shoot video installation device step by step and where we can buy parts of the device
thanks for sharing! super helpful!!
Damn, I bet you could fry a chicken in about 30 seconds with that thing.
Hi I have a question . To get to ultra high vacuum is it possible to use a double “o” ring ? In theory ???
Thanks very much
No. Ultra high vacuum requires heating the lot out. Therefore no rubber.
4:05 Is there a reason the turbo pump needs to be in a vertical position?
Yes, the bearing. The rotor is quite heavy, and it runs at 1500Hz, equivalent to 90'000 rpm. One bearing is magnetic, while the other is a ball bearing.
Make sure to wear gloves when touching parts. Proceeds to touch every part bare handed...
You failed at listening.
well explained, Thanks!
How much money did you put in there? Any advice for us diy-enthusiasts for keeping the costs down?
Thx!
+Alvaro Rodriguez eBay eBay eBay that's basically all you can do, and all I did. Also make connections and talk to people, you'll start to realize your friends friends have vacuum chamber parts they are willing to give you
¿Have you considered manufacturing your own parts?
Im thinking wether to buy a small chinese-ish cnc, or build myself and electric oven, a press and sinter.
Not too sure if sintered parts will cut it for vacuum, even if the have a 100% fill.
check out this guy's build, luciano jorge ritchie, for doing telescope mirrors for ideas: ruclips.net/video/75AoWl3jhcQ/видео.html. I don't know what you want to do but he shows how you can make a high vacuum system for not that much money.
thank YOU
That is a fantastic chamber! I am building a vacuum chamber and I want to add a gauge, I was thinking of buying a MKS 901p transducer, though I am not familiar with the analog output. How would I measure the pressure indicated by the analog output? Do I need an arduino, voltmeter, or what? As far as programming goes, I know how to use python, so yeah, I am quite a newbie at this...
+plls12 analog output means it will give you an analog voltage usually between 0 and 10 volts proportional to the pressure. You can just use a voltmeter
Thanks, I guess MKS has a manual that lists X voltage means Y pressure (Torr), if not, how can I interpret my pressure in Torr?
Thank you.
is that Teflon tape a problem?
Very informative. Thank you
OK..... I'm Just 2 years late, but here it goes... put like a crab claw or any other exoskeleton and deposit metal on it, maybe marine exoskeleton would react different from insects
Where did you get your chamber?
I'll just buy some diffusion pumps off ebay I said. I'll figure out a way to make a cheap vacuum chamber for sputtering I said... Oh boy the rabbit hole I'm diving into.
Impressive equipment! Have you ever come across Edwards speedivac connectors? Are they suitable for UHV?
Never seen one, but because they're made be Edwards I would assume they're good for at least high vacuum.
thank you for much
Why do you need those valves, can't you just pump through the turbopump directly as it will pass everything feely anyway when not running and only later when main pump cannot suck anymore you tun it on
I think I read that you can but it has some disadvantages, like lower roughing speed to get the chamber initially down to low pressure. Maybe some other problems too but I can't find the reference right now.
@@perspectivex
I do not see any logical explanation for those issues, because turbopump is essentially just a plain tube with some turbines, and it practically does not interfere with airflow
while adding extra valves and extra plumbing will definitely increase leaks and vacuum chamber volume increasing evacuation time that way.
I could assume some safety issues because if you let air in quickly you can damage the pump but this can be solved in other ways.
@@deltaxcd No idea... I'm starting out with vacuum systems and just relaying what I was pretty sure I read so you'd have to Google it to see if you can confirm. Just because it's not obviously logical doesn't mean there's not some perhaps more obscure reason for it. Also I see now that Sam replied to Matthew Beardmore in the comments below about this, saying: "generally frowned upon because it will cause the turbo to freewheel and spin up".
@@perspectivex
I never noticed any information about that either so it is hard to tell if this is some kind of stupidity or something important. and I am also just starting with the vacuum but in a less expensive way.
the fact that it will cause turbopump to spin um is nothing to care about either
I suspect that this can be a mistake copied from ion pumps because if instead of turbopump you use ion/getter pump it is absolutely required to use this kind of system
Should I use greese when I connect a kf style connection?
+Island Labs usually grease is used for old o rings that have cracks but a little bit doesn’t hurt for mid vacuum.
Sam Zeloof I'm shooting for a vac in the -6 to -10 range and I'm losing the battle, I have some kf connections that I cant get rid of (sensors and the connections to my roughing and backing pumps) do you have any pointers on how to get the best seal from KF? I have stopped clamping down super tight and I'm using new rings every time I reconnect flanges, I perfectly clean with acetone and dry. Is there something I'm missing or am I expecting too much performance from these seals? Does it matter if I use buna, silicone or FMK?
Thanks for the video BWT great info
@@islandlabs7641 go for viton, don't soak in solvent the rubber absorbs it
Did I sell some parts to you ? :) :)
my question from a total beotian
why dont you use more welding, why to use windows. we have very small cameras they could be put inside and just a USB 3 connector must be embedded this connector can take the maby cameras+ all the probe inside+ small robotics hands control .
From outside it will not be very glamour but it could be much cheaper
please tell me what is the point I missed ?
Honestly i have no clue what youre asking but this system could not have been made much simpler.
@@SamZeloof I think he's saying put cameras and other equipment inside and make the chamber basically without ports so it'd be cheaper, just small holes to feed cables in that are sealed somehow. But I guess the outgassing from all the stuff inside would negate getting to high vacuum and introduce lots of contaminants.
What is an NPT, and what does it stand for?
National pipe thread, usually used by plumbers and not high vac people
thank you!
could you make pyrolytic graphite with this and put it as a video? btw excellent video. loved it. please upload more such videos.
Do you use the ceramic metallization in the brazing vacuum components? What is metallization? Pls check as below: ruclips.net/user/shortsn1w9N9KF30w
Hey Sam, Great to see a video on this equipment. I am a Vacuum Specialist with 25 years in the industry, I run a Company in the UK. Please feel free to get in touch if you have any questions. We would be happy to help. Check us out on www.evapsolutions.co.uk
Get rid of the acetone residue? Are you freaking serious? If the acetone has some non-evaporating stuff in it, then who's to say that the same thing isnt true for the isopropyl alcohol mixture? If you're that worried about non-evaporating stuff in acetone, you should distill your acetone instead of using isopropyl alcohol later on
Very expensive hobby.
99 percent alcohol :)))
That is vacuum out a whole new level I want one.
Thank you.
Where did you get your chamber?