Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - Moink

Pages: [1]
Any Other Business / Re: Camcorder Help
« on: May 24, 2013, 09:03:25 PM »
Interesting: there are parallels to some work I did more than 20 years ago, while I was at the University of Arizona in Tucson.

I worked with Roger Angel in spring 1992 on the spin casting of the 6.5m diameter primary mirror for the MMT telescope on Mount Graham in southern Arizona. (MMT originally stood for Multiple Mirror Telescope, because it originally had 6 individual 1.8m diameter mirrors; the 6.5m single mirror replaced them all). Roger's spin casting technique involves melting chunks of glass in a giant rotating oven. Because the oven is rotating, the glass adopts a parabolic shape when it turns into a liquid: by holding that spin rate and then turning the oven off, you freeze the glass in a shape very close to the one you need to polish it to to make it useful in a telescope. Saves literally years of machining / polishing time.

(Actually, it's even cleverer than that, but I'll leave the interested to google for more info).

Anyway, during the casting of the MMT 6.5m mirror, I worked with a student called Dave Wittman to take pictures of the inside of the oven as the rotated, so we could make a time lapse movie of the glass melting and adopting its parabolic shape. This involved a CCD camera bolted to the outside of the oven staring through a glass window, taking a picture every 3 minutes for 33 hours or so.

Now, like you, we had the same problem: staring into a hold oven with melting glass over the base meant almost nothing was distinguishable: it was just a glowing mass of cherry-red and yellow. How was that solved? By firing a powerful UV flashgun every time the camera took a shot, and relying on the CCD being sensitive at short wavelengths. That provided all the contrast we needed, as can be seen in the resulting time lapse movies: (see the bottom of the page)

     The pictures were b/w; we colourised them to make them look like the inside of an oven  8). And remember, this was 1992; be kind (I'm amazed that these are still on the web, to be honest ;)):

     So, fast forwarding to the 21st century, one option for you could be to use a strong blue / UV spotlight on your metal work and use a corresponding filter on a stock video camera, admitting just that light. (If you use UV, of course, you need to be careful about your eyes too).

     But I also suspect that this is a solved problem in similar areas, so some googling might be in order ...  ;)

Many many thanks Mr Artist, i do actually understand some of it but i think i will have to read it a couple more times before it sinks in! Most people would think it's an easy problem to solve but this is certainly the best advice i have received so far.
I knew nothing was beyond the knowledge of the Frostieverse.
Many thanks again   :) 

Any Other Business / Camcorder Help
« on: May 23, 2013, 03:55:18 PM »
Hello Folks
I work at a Drop Forging company in the West Midlands. I realise it is a bit cheeky ;) but could I ask if anyone could advise in finding a suitable camcorder?
We need to be able to video our processes but the problem we have is, it is a dark atmosphere and we use hot metal (1300 degrees C) so there is a lot of thermal glare. With a normal camera it is almost impossible to make out any sort of detail (We have to manipulate the metal and need a way to record this)
Are there any suitable cameras that you could recommend?
I do know that there are quite a few fellow Frosties that do this professionally or are gifted amateurs so any help would be greatly appreciated.

Frost* / Re: Fogey's Big Banana World Tour - Sign-Up List
« on: January 05, 2011, 12:45:38 PM »
Bung me on the list as well , if i'm not too late :cry:

Frost* / Re: Jem back on twitter
« on: December 31, 2010, 10:21:32 AM »
That about sums it up perfectly Pedro

and Happy New Year to everyone as well  :)

Any Other Business / Re: BUGGLES AGE OF PLASTIC!
« on: August 01, 2010, 03:35:46 PM »
Quote from: "ChrisX"
Quote from: "Twang"
The album Age of Plastic is a hidden Classic......Discuss.

Nope, Adventures In Modern Recording is the hidden one... That one finally got a re-release with a truckload of quite interesting extra tracks incl. some tunes intended to be used by Yes.

Very true, as far as i remember it was actually a better album. Just going to see if i can still get it .................. ;)

Frost* / Re: Ah we're back I see :-)
« on: March 29, 2010, 01:02:09 PM »
Late as usual, tis very posh in here now though, don't you think?

Frost* / Re: Spousal Verdict
« on: December 01, 2008, 12:45:32 PM »
Not really the much better half's music taste, but she does quite like it. Saline is her fave at the moment

« on: November 28, 2008, 02:14:58 PM »
Mine arrived today as well woohoo, Many thanks JJJ & TLD all your efforts are well appreciated

Frost* / Re: CRS selling EIMA
« on: November 19, 2008, 05:54:19 PM »
Yeah big THANKS to TLD and JJ. Obvious they are under pressure (Due to lost orders by CRS) but even so, quick & sensible  ;)  replies to PM's, and i think things are getting sorted now.
And to top it all TLD is a Baggie - Woohoo :lol:

Frost* / Re: Well this is nice.
« on: November 07, 2008, 01:28:53 PM »
Oooooooooooooooh, very nice in here isn't it?

Pages: [1]