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.

@RateReducer

2 жыл бұрын

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).

@RateReducer

4 жыл бұрын

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.

@ibrahimkaragoz9596

3 жыл бұрын

@@RateReducer hi Can i meet you?

@ibrahimkaragoz9596

3 жыл бұрын

@@RateReducer What is your job?

@ibrahimkaragoz9596

3 жыл бұрын

@@RateReducer Can you give information about this subject?

@vpr1422

2 жыл бұрын

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

This is awesome!

@RateReducer

5 жыл бұрын

Thanks!

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???

obrigado

Watch out for the Roentgens if you fire up the Anode. ;-)

@torquemada1971

4 жыл бұрын

3.6 Roentgen - Not great not terrible.

@jamescostello6529

3 жыл бұрын

@@torquemada1971 Most likely just energizing the filament preheat circuit so no radiation.

@t8283287

2 жыл бұрын

@@jamescostello6529 plus you need a potential difference across the anode and cathode of at least 50,000 volts

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.

@wardogies

5 жыл бұрын

Thom Thumbe I know I always wonder what that noise was

@joshualogan6655

4 жыл бұрын

@@wardogies It's high voltage.

@t8283287

2 жыл бұрын

@@joshualogan6655 no it is the anode spinning

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)

@Butterkeks551

6 жыл бұрын

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.

@jessederue1418

2 жыл бұрын

@@Butterkeks551 try seconds

Hi, what power supply did you use for the filaments?

@RateReducer

2 жыл бұрын

Adjustable laboratory power supply

What kind of power does it draw? I'm not an electrical engineer, but does this have some special power supply as well?

@RateReducer

4 жыл бұрын

Anode needs high voltage DC, I think it was 125kV or 150kV. Yes it has a special power supply.

@jessederue1418

2 жыл бұрын

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 !

@RateReducer

3 жыл бұрын

Yes exactly 👍 Imagine 50kW of power on a small spot... Thank you!

@jessederue1418

3 жыл бұрын

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.

@t8283287

2 жыл бұрын

Yes...look at the traces on the anode face

@garyspencer1711

2 жыл бұрын

@@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.

@RateReducer

Жыл бұрын

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.

@barbaraeasley6164

Жыл бұрын

@@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.

@RateReducer

Жыл бұрын

@@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.

What did you use for the stator supply?

@RateReducer

7 жыл бұрын

Two coils from old contactors and a capacitor on a variac.

@flaplaya

2 жыл бұрын

Nice a two phase AC (rotating magnetic field).

Was it intended to run horizontally? I wonder how it sounds operated vertically. Nice video, Thank you.

@RateReducer

3 жыл бұрын

I don't know. It sounds quite similar. I have another video of these tubes with turning anode but in vertical position.

@jessederue1418

3 жыл бұрын

Rodney I work on them. They are intended for horizontal or vertical positions hence CTs.

@rodneymiller5926

3 жыл бұрын

@@jessederue1418 Thank you.

Thank you May I know where is the location of the bearing?

@RateReducer

6 ай бұрын

It's on the opposite side of the anode, far away from the heat.

What is the name of the used oil?

Sir namaste.how long distance between anode and cathode of x-ray tube.plz solve my problem.

@RateReducer

5 жыл бұрын

I can only estimate the distance. 2 - 3cm.

@radakovicv

4 жыл бұрын

1 cm, by book

How Old is it?.

You don't power to cathode? only you powered to anode?

@RateReducer

6 жыл бұрын

Neufloxin Floaxacin i do not produce x-rays i just spin the anode and heat the filaments.

@anthonyboarman3833

3 жыл бұрын

@@RateReducer To produce you would need high voltage to propel electrons at high speed to anode.

How much radiation does it emit ?

@vpr1422

2 жыл бұрын

It doesn't if there is no electric field pushing the electrons against the anode

but why does it have to rotate,... is it to do with the angle of emanation of electron or because of overheating?

@RateReducer

7 жыл бұрын

thaumas ein to improve power handling

@belabertalan

6 жыл бұрын

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.

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?

@RateReducer

7 жыл бұрын

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.

@luiscuevasborrero5377

6 жыл бұрын

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.

What is meant by resolution and exposure here?

@leothecrafter4808

Жыл бұрын

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.

@ashwinganapathy223

Жыл бұрын

@@leothecrafter4808 Thank You

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?

@RateReducer

6 жыл бұрын

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.

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

@RateReducer

3 жыл бұрын

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 ^^

Ooof. Those bearings... 😬

So x-ray tube is actually also a source of visible "targeting" light?

@RateReducer

3 жыл бұрын

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

@polishpatriot7953

3 жыл бұрын

@@RateReducer The device being just a casual visible light source?

@craigroth8710

6 ай бұрын

​@@polishpatriot7953 Small light bulb in the collinator housing. I believe there is a mirror to deflect the light down.

Is the motor separate from the tube?

@jessederue1418

4 жыл бұрын

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!

@muhaiminchoudhury2866

4 жыл бұрын

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.

@neogeo8267

3 жыл бұрын

@@muhaiminchoudhury2866 looks like motor core is inside tube and exciting coils are outside. So either induction motor or perhaps permanent magnet rotor.

Well done. Thank you. Rotate anode to prevent hot spots?

@RateReducer

7 жыл бұрын

Robert Gift yes - to increase power handling

@jwrn4u

2 жыл бұрын

The energy is turned into 99% heat and 1% x rays

What is the function of the filament?

@RateReducer

2 жыл бұрын

It emits electrons

Cooolllll.

also,... is it safe to stand so close while it is operating?

@RateReducer

7 жыл бұрын

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

@RateReducer

2 жыл бұрын

None because I don't run it. There is no high voltage applied.

Cool and for what the utility?

You didn’t even fire up the tube, you just turned on the heating filament

@RateReducer

3 жыл бұрын

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.

@venceremosallende422

3 жыл бұрын

@@RateReducer Have you ever tried it inside the oil container?

@RateReducer

3 жыл бұрын

@@venceremosallende422 no but i have another smaller xray unit left. Maybe ill try to run it ;)

@venceremosallende422

3 жыл бұрын

@@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.

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

@RateReducer

5 жыл бұрын

It's a Philips tube. 125kV. I think I used about 5V on the filament. MFK - Daniel ;)

how on earth were you not exposed to xrays?

@RateReducer

7 жыл бұрын

Cooldude 265 simple... there is no high voltage applied on the anode.

Where did you get this? So cool to collect

@RateReducer

6 жыл бұрын

Rylan Sasaki Henry Ebay

@thatonethattalksalot7656

6 жыл бұрын

RateReducer okay, thanks!

Playing with xray for fun??? OMG

@RateReducer

5 жыл бұрын

It needs high voltage applied to generate x-rays. I did not do it in the video.

It will burned

silent movie? blah

@RateReducer

3 жыл бұрын

Yes... I am thinking about to talk in my next videos - shall I do it?

@mr1enrollment

3 жыл бұрын

@@RateReducer it is a pet peeve of mine that so many KZread videos are silent. Is it fear? Embarrassment? or what that is the limit?

@RateReducer

3 жыл бұрын

@@mr1enrollment englisch is not my mother tongue, so yes maybe embarrassment.

@mr1enrollment

3 жыл бұрын

@@RateReducer just go for it