How the hell it maintains high vacuum with bearings and shaft going through the glass? Or it is only magnetically copouled with outside without shaft protruding?Does it stop supplying power when one wants to start x-ray production? I would guess magnetic field from the motor would influence trajectory of electrons from the kathode, and make x-rays of lower quality (energy spread and poorer colimiation).
It's magnetically coupled. I don't know if the rotor power supply switches off during x-ray usage - that's a good question. Maybe. It would be no problem at all to switch it off because the anode will rotate very very long once it is turning. I tried it... 1 hour easily without even slowing down much.
I'm guessing the magnetic field doesn't have that much range, and will very likely be much weaker (negligibly weaker) than the electric field pushing the electrons against the anode
And thus becomes clear the noise I heard as a small child when getting an X-Ray in the hospital. The noise in the X-Ray head sounded very sinister to me. I was completely sure that something bad was going to happen or it was going to hurt or I'd end up dead.
Why does the anode plate have to rotate at high RPM's ? Is the flux of electron beam energenic enough to cause surface damage to anode plate if rotated too slow ? GREAT camera work here. Especially the close-up of the filaments !
@@jessederue1418 THANKS ! ! I didn't even give too much thought to any focus position point .....but, here we are discussing x-ray beam energy, and, .....x-ray wavelengths that are so, so, small. Thank you. Gary S.
What circuit are you using to spin the anode? I see what appears to be (2) electromagnets taped together about 90 degrees apart. Could you describe this setup in more detail? Thanks.
Yes, two contactor coils. One directly connected to a variable transformer and the second one with a cap in series to provide a phase shift. That creates a "rotating field" that drives the rotor. In fact its a Steinmetz circuit.
@@RateReducer So I looked more closely at my tube. It still has the "coils" installed around the rotor inductor. Three wires for connection are still there: yellow, black and red. Could I apply voltage to these wires in lieu of external coils? If so, would you know the assignment of the colored wires? I could send you an image of what I have for clarity. I'm unable to attach to this thread. Thanks again.
@@barbaraeasley6164 use Google. "Steinmetzschaltung" that's exactly what you need. You have two coils that are internally connected. You just need a capacitor (few uF) and a variac. You can't really break anything if you watch the current.
How did you wire up the filaments and rotating anode. I'm an xray tech and have 4 tubes, complete with their stators, but I don't know how to wire. Been trying to look up diagrams, and I'm good with electrical work, just don't know the correct voltages. Trying to make it for display and don't want to burn the filaments out on my tubes, and getting them to spin would be awesome. Tried straight ac once but didn't work. Not sure how the (and what specific kind) of capacitor it needs to start. I know the filaments are ac also, but would a dimmer switch work or enough voltage from DC?
Hi. I used a adjustable DC power supply on the filaments. I don't know the proper voltage or amperage of the filament so i just increased the voltage until the filament(s) light up. It does not matter if use DC or AC on the filaments... I used coils of old contactors as a improvised stator winding. One coil on AC and the other coil also on AC but with a capacitor in series. The cap generates a phase delay and so there is a rotary field created by the two coils. Your stator supply should be a 110V or 230V type. Try a cap in the 10µF range. When you have a variac - use it.
Daniel Rivera,Hola el filamento del Tubo prende con 16 VAC no más porque daña el filamento.como poner a rotar el Anodo todavía no se.si sabés cómo me deja saber.Lindo día.
The larger the spot size the lower the resolution. It directly affects the resolution of any image you take, think of it like that, a small light source casts clear shadows while a larger one casts very diffuse shadows. But the smaller filament won't boil off as many electrons so you have to do longer exposures or generally use less dose.
No. That's just the glow of the filament. The tube is operated in a sealed container filled with oil. No light comes out of this container. The targeting light is a separate device
thaumas ein For heat dissipation. There's vacuum inside and the anode gets hot fast in those conditions so it must be rotated to extend operation time.
Hi I work on these machines and most tubes i know have the stator and rotor on the inside of the glass housing. But normally tubes come shipped in the tube enclosures already. Dealing with tube oil can be quite the pain if youre not careful!
My question was is the motor or the coil is which rotates the anode inside the xray tube is that coil or motor fixed inside the xray tube or they are separate part? As I came to know from a xray tube seller he tells both are separate part, there is no motor or coil inside the xray tube. Maybe the coil or motor can be inside the shield housing of the xray tube, but not inside the xray tube.
@@muhaiminchoudhury2866 looks like motor core is inside tube and exciting coils are outside. So either induction motor or perhaps permanent magnet rotor.
Hi my friend. Can you explain me diagram of external exciter to anode? i would like to create one. Always i used start capacitor motor. this way is more practical. Thanks
Do you know the Type No./Manufacturer of the tube? Also, at which voltage did you drive the filaments? Asking cause I might have the same tube, here. Greetings
Yes, because it would not work outside of it's oil filled container. There would be a instant high voltage short circuit. I just explain how the tube works.
@@RateReducer Nice! I didn‘t want to seem rude. I just wanted to know how it looks when one pole is rotating. However ,my curiosity is in no way important compared to your safety and health. Please be careful with these things and have a nice day.
Rotating anodes are a must in CT scanners. Dental X-ray machines uses a much smaller tube with a fixed anode.
This video helped me immensely with understanding how an X-ray tube works. Thank you so much.
The video and the viewer's comments are excellent.
Thanks! :)
Thank for your demonstration.
How the hell it maintains high vacuum with bearings and shaft going through the glass? Or it is only magnetically copouled with outside without shaft protruding?Does it stop supplying power when one wants to start x-ray production? I would guess magnetic field from the motor would influence trajectory of electrons from the kathode, and make x-rays of lower quality (energy spread and poorer colimiation).
It's magnetically coupled.
I don't know if the rotor power supply switches off during x-ray usage - that's a good question. Maybe. It would be no problem at all to switch it off because the anode will rotate very very long once it is turning. I tried it... 1 hour easily without even slowing down much.
@@RateReducer hi
Can i meet you?
@@RateReducer What is your job?
@@RateReducer Can you give information about this subject?
I'm guessing the magnetic field doesn't have that much range, and will very likely be much weaker (negligibly weaker) than the electric field pushing the electrons against the anode
And thus becomes clear the noise I heard as a small child when getting an X-Ray in the hospital. The noise in the X-Ray head sounded very sinister to me. I was completely sure that something bad was going to happen or it was going to hurt or I'd end up dead.
Thom Thumbe I know I always wonder what that noise was
@@wardogies It's high voltage.
@@joshualogan6655 no it is the anode spinning
What kind of power does it draw? I'm not an electrical engineer, but does this have some special power supply as well?
Anode needs high voltage DC, I think it was 125kV or 150kV. Yes it has a special power supply.
very special power supply but if you are just warming up the filament like he is doing you can use extremely low volatages to use as a cool lamp!
Why does the anode plate have to rotate at high RPM's ? Is the flux of electron beam energenic enough to cause surface
damage to anode plate if rotated too slow ? GREAT camera work here. Especially the close-up of the filaments !
Yes exactly 👍
Imagine 50kW of power on a small spot...
Thank you!
Hi Gary. Yes the anode spins at about 10k RPM reason being is for heat. Too much heat melts the target and then changes the focal point.
Yes...look at the traces on the anode face
@@jessederue1418 THANKS ! ! I didn't even give too much thought to any focus position point .....but, here we are discussing
x-ray beam energy, and, .....x-ray wavelengths that are so, so, small. Thank you. Gary S.
This is awesome!
Thanks!
What circuit are you using to spin the anode? I see what appears to be (2) electromagnets taped together about 90 degrees apart. Could you describe this setup in more detail? Thanks.
Yes, two contactor coils. One directly connected to a variable transformer and the second one with a cap in series to provide a phase shift. That creates a "rotating field" that drives the rotor. In fact its a Steinmetz circuit.
@@RateReducer So I looked more closely at my tube. It still has the "coils" installed around the rotor inductor. Three wires for connection are still there: yellow, black and red. Could I apply voltage to these wires in lieu of external coils? If so, would you know the assignment of the colored wires? I could send you an image of what I have for clarity. I'm unable to attach to this thread. Thanks again.
@@barbaraeasley6164 use Google. "Steinmetzschaltung" that's exactly what you need. You have two coils that are internally connected. You just need a capacitor (few uF) and a variac. You can't really break anything if you watch the current.
How much the vaccum pressure in the bulb....and can we fix it....other way ...if tupe expier date .....what it is expier ?????....can we fix it???
Can you help me a little bit more? How long does a X ray tube will survive if you run it continuously? (like 30 minutes or more)
Without the housing which is filled with oil to cool the tube not even 30 minutes. A couple of minutes max. The whole thing would just overheat.
@@Butterkeks551 try seconds
Hi, what power supply did you use for the filaments?
Adjustable laboratory power supply
Watch out for the Roentgens if you fire up the Anode. ;-)
3.6 Roentgen - Not great not terrible.
@@torquemada1971 Most likely just energizing the filament preheat circuit so no radiation.
@@jamescostello6529 plus you need a potential difference across the anode and cathode of at least 50,000 volts
Was it intended to run horizontally? I wonder how it sounds operated vertically. Nice video, Thank you.
I don't know. It sounds quite similar. I have another video of these tubes with turning anode but in vertical position.
Rodney I work on them. They are intended for horizontal or vertical positions hence CTs.
@@jessederue1418 Thank you.
obrigado
Thank you
May I know where is the location of the bearing?
It's on the opposite side of the anode, far away from the heat.
What did you use for the stator supply?
Two coils from old contactors and a capacitor on a variac.
Nice a two phase AC (rotating magnetic field).
How did you wire up the filaments and rotating anode. I'm an xray tech and have 4 tubes, complete with their stators, but I don't know how to wire. Been trying to look up diagrams, and I'm good with electrical work, just don't know the correct voltages. Trying to make it for display and don't want to burn the filaments out on my tubes, and getting them to spin would be awesome. Tried straight ac once but didn't work. Not sure how the (and what specific kind) of capacitor it needs to start. I know the filaments are ac also, but would a dimmer switch work or enough voltage from DC?
Hi. I used a adjustable DC power supply on the filaments. I don't know the proper voltage or amperage of the filament so i just increased the voltage until the filament(s) light up. It does not matter if use DC or AC on the filaments... I used coils of old contactors as a improvised stator winding. One coil on AC and the other coil also on AC but with a capacitor in series. The cap generates a phase delay and so there is a rotary field created by the two coils. Your stator supply should be a 110V or 230V type. Try a cap in the 10µF range. When you have a variac - use it.
Daniel Rivera,Hola el filamento del Tubo prende con 16 VAC no más porque daña el filamento.como poner a rotar el Anodo todavía no se.si sabés cómo me deja saber.Lindo día.
Sir namaste.how long distance between anode and cathode of x-ray tube.plz solve my problem.
I can only estimate the distance.
2 - 3cm.
1 cm, by book
What is meant by resolution and exposure here?
The larger the spot size the lower the resolution. It directly affects the resolution of any image you take, think of it like that, a small light source casts clear shadows while a larger one casts very diffuse shadows. But the smaller filament won't boil off as many electrons so you have to do longer exposures or generally use less dose.
@@leothecrafter4808 Thank You
How Old is it?.
So x-ray tube is actually also a source of visible "targeting" light?
No. That's just the glow of the filament. The tube is operated in a sealed container filled with oil. No light comes out of this container. The targeting light is a separate device
@@RateReducer The device being just a casual visible light source?
@@polishpatriot7953
Small light bulb in the collinator housing. I believe there is a mirror to deflect the light down.
You don't power to cathode? only you powered to anode?
Neufloxin Floaxacin i do not produce x-rays i just spin the anode and heat the filaments.
@@RateReducer To produce you would need high voltage to propel electrons at high speed to anode.
but why does it have to rotate,... is it to do with the angle of emanation of electron or because of overheating?
thaumas ein to improve power handling
thaumas ein For heat dissipation. There's vacuum inside and the anode gets hot fast in those conditions so it must be rotated to extend operation time.
Well done. Thank you. Rotate anode to prevent hot spots?
Robert Gift yes - to increase power handling
The energy is turned into 99% heat and 1% x rays
What is the name of the used oil?
but why were there no white "snow" pixels on the screen? was the voltage on the fillament too low? why didn't we see the radiation on camera?
Zeekat heating the filament is not enough to produce x-rays you also need to apply high voltage between anode and cathode. For this tube 150kV.
How much radiation does it emit ?
It doesn't if there is no electric field pushing the electrons against the anode
Cooolllll.
Is the motor separate from the tube?
Hi I work on these machines and most tubes i know have the stator and rotor on the inside of the glass housing. But normally tubes come shipped in the tube enclosures already. Dealing with tube oil can be quite the pain if youre not careful!
My question was is the motor or the coil is which rotates the anode inside the xray tube is that coil or motor fixed inside the xray tube or they are separate part? As I came to know from a xray tube seller he tells both are separate part, there is no motor or coil inside the xray tube. Maybe the coil or motor can be inside the shield housing of the xray tube, but not inside the xray tube.
@@muhaiminchoudhury2866 looks like motor core is inside tube and exciting coils are outside. So either induction motor or perhaps permanent magnet rotor.
Ooof. Those bearings... 😬
What is the function of the filament?
It emits electrons
Hi my friend. Can you explain me diagram of external exciter to anode? i would like to create one. Always i used start capacitor motor. this way is more practical. Thanks
I used 2 relay coils on a variac, one directly on the variac and the other one in series with a capacitor. It was just an experimental construction ^^
also,... is it safe to stand so close while it is operating?
thaumas ein it needs about 125kV to produce xrays... I only run the filaments and turn the anode.
I have a query -what safety measures are you taking while operating the X-ray tube
None because I don't run it. There is no high voltage applied.
Where did you get this? So cool to collect
Rylan Sasaki Henry Ebay
RateReducer okay, thanks!
how many watts will it consume if you run it for 10 minutes?
Do you know the Type No./Manufacturer of the tube?
Also, at which voltage did you drive the filaments?
Asking cause I might have the same tube, here.
Greetings
It's a Philips tube. 125kV.
I think I used about 5V on the filament. MFK - Daniel ;)
You didn’t even fire up the tube, you just turned on the heating filament
Yes, because it would not work outside of it's oil filled container. There would be a instant high voltage short circuit. I just explain how the tube works.
@@RateReducer Have you ever tried it inside the oil container?
@@venceremosallende422 no but i have another smaller xray unit left. Maybe ill try to run it ;)
@@RateReducer Nice! I didn‘t want to seem rude. I just wanted to know how it looks when one pole is rotating. However ,my curiosity is in no way important compared to your safety and health. Please be careful with these things and have a nice day.
Cool and for what the utility?
how on earth were you not exposed to xrays?
Cooldude 265 simple... there is no high voltage applied on the anode.
Playing with xray for fun??? OMG
It needs high voltage applied to generate x-rays. I did not do it in the video.
It will burned
silent movie? blah
Yes... I am thinking about to talk in my next videos - shall I do it?
@@RateReducer it is a pet peeve of mine that so many UA-cam videos are silent. Is it fear? Embarrassment? or what that is the limit?
@@mr1enrollment englisch is not my mother tongue, so yes maybe embarrassment.
@@RateReducer just go for it