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Mine Exploration Forum

Author Explorer cameras
tomh

Joined: 16/07/2009
Location: st austell

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Posted: 10/08/2012 12:05:07
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As my friends and I are doing more exploration we are finding there is nothing more dissapointing than finding a shaft, rigging it, descending it to find it goes to nothing.

Also it can be frustrating to get to a shaft or winze underground and not be able to see whats above or below you.

Has anyone had any experience of putting a video camera on the end of a rope/stick and dangling it down a shaft to see what is/isnt there. Preferabely with a screen for playback.
IP: 86.186.89.37
pat

Joined: 22/11/2007

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Posted: 10/08/2012 12:28:38
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have done a little of this,see denzil vids on utube or give us a bell IP: 88.111.14.163
stuey

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Joined: 15/08/2007

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Posted: 10/08/2012 13:23:53
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Dines and the 6" maps are usually enough to tell you what's what and if it goes.

Just drop them!
IP: 92.29.174.67
tomh

Joined: 16/07/2009
Location: st austell

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Posted: 10/08/2012 13:32:26
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you obviously have not been to st blazey woods before! More shafts than you can shake a stick at! IP: 86.186.89.37
stuey

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Joined: 15/08/2007

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Posted: 10/08/2012 13:46:14
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Lots of trees to rig off! IP: 92.29.174.67
tomh

Joined: 16/07/2009
Location: st austell

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Posted: 10/08/2012 14:06:03
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Yes in most places, the main problem is there are too many holes to make random drops viable! IP: 86.186.89.37
RJV

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Joined: 16/03/2008
Location: Cleveland

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Posted: 10/08/2012 14:15:20
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tomh wrote:

Yes in most places, the main problem is there are too many holes to make random drops viable!


If that's your local patch you should count your blessings. A large number of us live in areas with a finite number of holes, if any...
A lifetime of exploring!

--

'Planning is just bad adventure.'
IP: 93.191.34.90
mikehiggins

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Joined: 11/08/2008
Location: Doncaster

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Posted: 11/08/2012 01:01:52
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Sticking a camera on the end of a rope isn't a good idea as it will inevitable hit the side of the shaft at some point and you'll probably need to buy a new one - and as some shafts are a bit on the wet side that'll have the same result. I built a casing to hold a digital camera with the facility to take video (Canon Powershot A1200 to be precise) out of bits of wood and aluminium and plastic tube that I had lying around, illumination via an LED Lenser P7. Amazingly, as it cost nothing to build, it works! Hang it on the end of a rope, set it running, switch on the light, drop it down (needs a bit of practice to minimise the rotation effect), pull it back up and, hey presto, you can see what's at the bottom (and anything interesting on the way down). IP: 86.186.223.33
lozz

Joined: 03/08/2012
Location: Cornwall

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Posted: 11/08/2012 10:48:33
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Back in the 80's here in Cornwall I used to work on TV/Video equipment, a video recorder turned up in the workshop one day with a tape in it, the tape was of a shaft decent at United Downs it was very good although I cannot remember the name of the shaft, Grylls maybe or something like that. I do not know if it was a bloke on the end of the rope holding a camera or just the camera on its own but I do remember that it's decent was quite stable. I think the footage was taken by someone at either Wheal Jane or Mt. Wellington possibly. As a guess I would say there must have been a drum winch feeding a centralized pully wheel over the shaft.

Lozz
IP: 86.174.135.152
tomh

Joined: 16/07/2009
Location: st austell

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Posted: 11/08/2012 19:49:46
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were planning to use if possible a high line with a pulley in the center or if nothing to rig off a long stick with a pully on the end of it.

Would be awesome to have a direct feed from the camera to the surface but am guessing that would be some serious £££

We were considering a go pro hd with a torch attached but then theres the question of how to watch it back at the surface.
IP: 109.152.93.228
pat

Joined: 22/11/2007

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Posted: 11/08/2012 19:58:56
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gopro now do a remote camera add on,if you look on their website you should get an explanation. I dont understand the techno bable ! but iv e just been to the gopro stand down at fistral boardmasters and seen it work IP: 88.111.0.233
lozz

Joined: 03/08/2012
Location: Cornwall

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Posted: 11/08/2012 20:30:34
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Some video cameras have a 50 or 75 ohm composite video output so enabling the signal to feed into a standard coaxial transmission line, you wouldn't need the expensive high quality stuff just bog standard aerial coax would be fine, that could be taped every 2 foot or so to the rope and you could plug the surface end into a monitor, you can get domestic wideband transmitters that you don't need a licence for but I am unsure of the maximum range, with a transmitter you would have to be limited to line of sight unless you rigged up a leaking feeder system but that would cost quite a lot for an off the shelf job and would probably require a repeater over long distances. The other poss is a wildlife/surveilance camera, some now come with a reasonable amount of digital storage. Out of all these I would plumb for an oldstyle video camera with an analogue composite video output and stuff that up some coax, if you used a higher grade coax you might even be able to dispense with the rope.

Lozz.
IP: 86.174.135.152
lozz

Joined: 03/08/2012
Location: Cornwall

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Posted: 11/08/2012 21:47:42
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A 100 mter roll of RG59U coax is around £40, cheapo monochrome cameras are cheap, if you lose/damage the camera it won't break the bank, led light clusters can be got cheap, You can use a twin wire feed taped to the coax for the DC feed, depending on lamp current consumtion you may be able to use a single wire and use the outer of the coax for the DC feed. For the coax single strand inner is best, the signal power attenuation over a correctly terminated coaxial line of 100 meters should not to be to bad.
Just an idea.

Lozz
IP: 86.174.135.152
KH....

Joined: 27/10/2010

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Posted: 11/08/2012 22:18:56
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I am tending towards Cat 5 cable and use a pair of balun's for the video, the other cores would power the camera and some Led lighting or use self powered lights.
Cat 5 cable is as cheap as chips!
Capture the video on a laptop.
Only done initial experiments so far, from my previous attempts stopping the camera spinning is the biggest problem!
Perhaps Cat 5 will be better as it is dispensed from the box.
IP: 95.147.59.112
SimonRL

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Joined: 27/11/2005
Location: North Wales

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Posted: 11/08/2012 22:47:50
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IA Recordings have put together some very trick camera gear for their video productions...

http://www.iarecordings.org/minecam.html

--

Half the lies you tell ain't true
IP: 217.44.18.49
Moore Books: Specialist Books I.A. Recordings: Mining and Industrial History DVDs Starless River - Caving Store Explore a Disused Welsh Slate Mine
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