The Nutter Pulls Apart Dental Xray  - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: November 01, 2012, 04:44:34 pm
content: cool yes but rather dangerous hence nutter who bottles pcb oil ?

author: Mediarocker
author_rank: Contributor
timestamp: November 01, 2012, 05:18:45 pm
content: I definitely hope he's wearing some form of radiation protection.... I don't care how well that leaded shield protects..

author: M. András
author_rank: Super Contributor
timestamp: November 01, 2012, 06:01:00 pm
content: wow that geiger counter was almost at maximum

author: G7PSK
author_rank: Super Contributor
timestamp: November 01, 2012, 06:24:31 pm
content: He was as safe as the dentist that used it originally. He did not put himself in the X ray beam at any time.

author: M0BSW
author_rank: Frequent Contributor
timestamp: November 01, 2012, 08:58:38 pm
content: Messing with this stuff, I think some people should be locked up for their own safety sake, let alone ours.

author: Dago
author_rank: Frequent Contributor
timestamp: November 02, 2012, 09:11:06 am
content: So uhh whats the big deal? The only hazard there MIGHT be is that the oil might be PCB.But an X-ray machine does not contain anything radioactive. It does not emit X-rays unless you like... power it on (seehttp://en.wikipedia.org/wiki/X-ray_tube).So unless the oil was PCB I don't see anything "nutty" in the video.

author: firewalker
author_rank: Super Contributor
timestamp: November 02, 2012, 09:32:49 am
content: The oil should be vegetable (Canola, Soya) oil as it is equipment constantly around people.Alexander.

author: amyk
author_rank: Super Contributor
timestamp: November 02, 2012, 01:38:44 pm
content: Interesting. I thought Xray tubes needed DC to operate, but didn't see a rectifier anywhere inside the unit.Looks likehas a competitor.

author: SeanB
author_rank: Super Contributor
timestamp: November 02, 2012, 02:57:12 pm
content: They don't need DC to operate, as the tube ia actually a diode, which just so happens to have a load built into it at the anode. It is quite happy with AC applied to it.Same with a microwave magnetron, the capacitor and diode is just there so that the transformer can be cheap, as it does not then need to be wound for 2kV isolation on the coil and the former, which would make it more than double the size and also require it to have a big core gap to handle the saturation, or it will need a big ferrite bias magnet to keep it in the linear core region.This one is oil cooled and has a very low duty cycle so the heat dissipation is not an issue for it, they just went for massive overkill as it worked out cheaper on a low production run unit. These tubes generally are run for under 100 hours total at 4-6 seconds at a time, not like a microwave where it will do thousands of hours at full power

author: Mediarocker
author_rank: Contributor
timestamp: November 02, 2012, 07:27:14 pm
content: Quote from: G7PSK on November 01, 2012, 06:24:31 pmWell given that this guy appears to open and test a lot of xray heads, I would expect him to at least take precautions to minimize his exposure. Of course he wasn't in the direct path of the beam, however with that open end of the shield I'd expect some leakage.. possibly negligible...

author: 8086
author_rank: Super Contributor
timestamp: November 03, 2012, 12:24:26 am
content: I feel sorry for the guys chisels.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 03, 2012, 12:50:40 am
content: QuoteMore so, as the dentist would have used it far more frequently.

author: Zero999
author_rank: Super Contributor
timestamp: November 03, 2012, 01:02:27 pm
content: He also ran it at a much lower voltage than the rated voltage (otherwise it would've arced over) so the X-ray output was less energetic.

author: Excavatoree
author_rank: Frequent Contributor
timestamp: November 03, 2012, 03:24:26 pm
content: Quote from: 8086 on November 03, 2012, 12:24:26 amObviously he's never heard of a cold chisel. Shop teachers* everywhere cringe in horror.*-sorry, I mean Industrial Arts Instructors

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: November 04, 2012, 10:00:38 am
content: Quote from: Excavatoree on November 03, 2012, 03:24:26 pmYes! I thought I was the only one who noticed!hammering plastic handles ... tsk ..tsk safety violation! who do I report?

author: SeanB
author_rank: Super Contributor
timestamp: November 04, 2012, 10:17:45 am
content: Cheap chineeeeeese chisel sets are only good as that. I see builders that treat all tools as one of 2 things, either a hammer, or a cold chisel.Will admit though that when using screwnails into concrete I will drill the hole and drive the screwnail in using the same SDS bit on the drill.

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: November 06, 2012, 01:51:28 pm
content: glasslinger (aka Ron Soyland) has a great YT channel. That bloke has kick arse glass working skills. Love his vacuum tube tutorials.