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Posts by royfellows

Showing 3880 results below:

Author Message
Topic: Grindon Hill Shaft (photo)
royfellows

Forum: North East England   Posted: 20/04/2015 12:03:08   Subject: Grindon Hill Shaft (photo)
I really have no idea but would be very careful
Hanging death, bad air, all suggests itself.

Inside the enclosure appears to be very vague about what is covered shaft and what is solid
Topic: Lamp Building for Dummies
royfellows

Forum: Lamps & Lighting   Posted: 17/04/2015 13:17:00   Subject: Lamp Building for Dummies
Yes and the Chinese bike lamps and torches that use LEDs in arrays parallel them to a common driver!
:o
Topic: Lamp Building for Dummies
royfellows

Forum: Lamps & Lighting   Posted: 17/04/2015 08:36:21   Subject: Lamp Building for Dummies
[quote="BertyBasset"]Does that mean that for multiple Leds, they need independent current sources?[/quote]

It depends how they wired, series, as Chris explained, the voltage adds up, in oth
Topic: Lamp Building for Dummies
royfellows

Forum: Lamps & Lighting   Posted: 16/04/2015 08:29:48   Subject: Lamp Building for Dummies
Found an old one and just tried it in 2 minutes off the lab power supply. In Effect, driving at say 60 mA will work....for a time.
Volts Current
3.0 = 0.01
3.2 = 0.03
3.5 = 0.05
Topic: Lamp Building for Dummies
royfellows

Forum: Lamps & Lighting   Posted: 15/04/2015 22:46:37   Subject: Lamp Building for Dummies
NO

Wouldn't it be nice if politicians gave such explicit answers to questions!

The difference in voltage between the Vf at the recommended current of 30 mA and poop will be less
Topic: Rhiwbach plans
royfellows

Forum: North Wales   Posted: 15/04/2015 22:34:19   Subject: Rhiwbach plans
Yes, I have them but on large sheets.
I can try to photograph them. I believe that I was given them a long time ago by 'Mole' Hine. If so I would need to ask him if OK first if only out of common
Topic: Lamp Building for Dummies
royfellows

Forum: Lamps & Lighting   Posted: 15/04/2015 17:39:25   Subject: Lamp Building for Dummies
Good luck with it.

I think I have made my point about the voltage, so if you want a better burn time why not use 2 X 2AA holders wired together + to + and - to -, that is, in parallel. So y
Topic: Lamp Building for Dummies
royfellows

Forum: Lamps & Lighting   Posted: 15/04/2015 08:18:40   Subject: Lamp Building for Dummies
[quote="Wormster"]hehe Roy!

Oh and I forgot to sa I saw it run on 2x AA duracell on the workbench!

[/quote]

So they must be parallel. 2S X AA = 3V, likely Vf of the LE
Topic: Lamp Building for Dummies
royfellows

Forum: Lamps & Lighting   Posted: 14/04/2015 22:12:43   Subject: Lamp Building for Dummies
A bit more
Assuming they parallel, the AA battery holder is series (usually are, 1.5V only drives clocks) and the vF at a 30mA drive current is about 3V, then 4 AAs will give about 6V

Topic: Lamp Building for Dummies
royfellows

Forum: Lamps & Lighting   Posted: 14/04/2015 22:01:47   Subject: Lamp Building for Dummies
A few things.
Oldham headsets normally switch on the low side, the block at the bottom is usually called the "positive terminal block" which has an external stud which is to engage and contact th
Topic: Fellows lamps forum.
royfellows

Forum: Lamps & Lighting   Posted: 13/04/2015 17:43:54   Subject: Fellows lamps forum.
[quote="NewStuff"][quote="royfellows"]...but the 4 cell packs are heavy and bulky[/quote]

I wonder what you would make of my 9 and 12 cell packs... :confused:[/quote]

I do a 12 c
Topic: Fellows lamps forum.
royfellows

Forum: Lamps & Lighting   Posted: 13/04/2015 15:59:04   Subject: Fellows lamps forum.
Lynx X2000

I thought I had better put this up.
Max output 2200 lumens, combines beam with low output foot light.

Weight 200 grams

Price £175

Basically
Topic: Fellows lamps forum.
royfellows

Forum: Lamps & Lighting   Posted: 13/04/2015 15:47:38   Subject: Fellows lamps forum.
[quote="gNick"]Roy,
A little question.

You say that your lights that work at a low voltage (single battery or multiples in parallel) will just get dimmer as the battery runs out wherea
Topic: New caplamp required
royfellows

Forum: General Chat   Posted: 13/04/2015 13:38:03   Subject: New caplamp required
The walk mode on all my lamps is about 200 lumens, battery time on this is 14 hrs plus for 4V lamps, 12 hrs plus for 8V lamps, on 2 cell battery packs.

8V lamps use 4 cells and are as effic
Topic: New caplamp required
royfellows

Forum: General Chat   Posted: 13/04/2015 11:33:45   Subject: New caplamp required
[quote="Tony Blair"]Roy, I am going through a bit of a change in how I operate. I've invested in some decent SRT equipment. The Trigon (which is my lamp of choice) is great. I do note that the users o
Topic: New caplamp required
royfellows

Forum: General Chat   Posted: 13/04/2015 10:42:29   Subject: New caplamp required
Oldham conversions are now discontinued bar remaining stock of Eco Stars, so its 2 dragon models or, as of today, 4 Lynx models.

I am about to announce the Lynx X2000 as a replacement for t
Topic: Copper staining (photo)
royfellows

Forum: South West England   Posted: 02/04/2015 17:19:33   Subject: Copper staining (photo)
They have all been taken in the adit. America Shaft is on the left as you go in, you can walk down into the cove and into the adit in relative safety, take a good torch. The shaft is on the left and w
Topic: Copper staining (photo)
royfellows

Forum: South West England   Posted: 02/04/2015 15:37:16   Subject: Copper staining (photo)
I was with her on that trip, its on the right hand side of the adit which is a footwall drive at that point.
If I could only find my survey!
Topic: Flooded Shaft (photo)
royfellows

Forum: South West England   Posted: 02/04/2015 15:31:24   Subject: Flooded Shaft (photo)
It is in the grounds of the hotel.
If I could find my survey it would be possible to extrapolate it to surface.
Best bet is an old map, the line of the deep adit is almost straight and follo
Topic: Wheal Hermon
royfellows

Forum: South West England   Posted: 02/04/2015 09:58:14   Subject: Wheal Hermon
I believe that adit (with a catwalk?) comes to day higher up. Not a tremendous lot to see in that mine which you will not have already found.
Topic: Wheal Margery
royfellows

Forum: New recruits!   Posted: 02/04/2015 09:49:06   Subject: Wheal Margery
The deep adit goes in from a little cove north of Porthminster Point. On the cliff top above are covered over shafts including America Shaft open underground.

The adit continues inland pass
Topic: Looking up at stopes (photo)
royfellows

Forum: South West England   Posted: 02/04/2015 09:39:55   Subject: Looking up at stopes (photo)
It doesn't look like it.
Stoping in the entrance of the adit has granite stemples, there are some small stopes further in with prominent copper staining.

Tell us more about the picture
Topic: Cambrian Mines Trust
royfellows

Forum: General Chat   Posted: 01/04/2015 08:52:31   Subject: Cambrian Mines Trust
Cwmystwyth Hydro Latest

Following a meeting with Barratt Associates on Sunday last it has been confirmed that connection issues with Scottish Power have been resolved.

Also a new
Topic: Access at Craig Y Ddinas silica mine
royfellows

Forum: South Wales   Posted: 31/03/2015 19:24:53   Subject: Access at Craig Y Ddinas silica mine
I have no intention of fitting any gates.

My approach regarding legal compliance with regard to potential public liability is to keep the surrounding fence in good order so as to provide a
Topic: Dry dark hole sought near Llanberis (Bolted up)... Its raining
royfellows

Forum: North Wales   Posted: 30/03/2015 20:25:01   Subject: Dry dark hole sought near Llanberis (Bolted up)... Its raining
Thinking about it, you dont want much do you.
Close by parking, dry, straightforward SRT, ready bolted.
You forgot the pub within 100 yds.

If you do find it, any chance of lettin
Topic: Dry dark hole sought near Llanberis (Bolted up)... Its raining
royfellows

Forum: North Wales   Posted: 30/03/2015 17:50:21   Subject: Dry dark hole sought near Llanberis (Bolted up)... Its raining
[quote="ChrisJC"]Llanberis copper mine has some nice pitches which are dry sometimes.

Chris.
[/quote]

A bit advanced as well as a climb to get there?
Topic: Underground Surveying
royfellows

Forum: Exploration Chat   Posted: 30/03/2015 17:00:25   Subject: Underground Surveying
Yea, mind made up.
I say ban and delete his threads.

Reason

Although mining relevant if he wants to advertise let him pay for it towards upkeep of the site
;D
Topic: Underground Surveying
royfellows

Forum: Exploration Chat   Posted: 30/03/2015 15:30:35   Subject: Underground Surveying
Does he contribute anything to the site?

I mean I plug my lamps, albeit under a general Q and A thread, but I think anyone who comes on here simply to post an advert should be given short s
Topic: Life of a lithium ion battery?
royfellows

Forum: Lamps & Lighting   Posted: 27/03/2015 20:55:28   Subject: Life of a lithium ion battery?
Don't mix up Lithium Ion and Lithium Ion Polymer which are different chemistries. The LiPo are ones to be careful with.
To further complicate matters there are different Lithium Ion chemistries,
Topic: What's your favourite digging tool? I've just found mine!
royfellows

Forum: General Chat   Posted: 27/03/2015 20:01:24   Subject: What's your favourite digging tool? I've just found mine!
[quote="Graigfawr"]No one's mentioned a shovelling board as being important!

My vote is for the humble 3ft x 2ft steel sheet.[/quote]

Piece of off cut from a pond liner, you know
Topic: Access to Long Rake Spa lower level?
royfellows

Forum: Midlands   Posted: 27/03/2015 10:26:33   Subject: Access to Long Rake Spa lower level?
Sounds like there has been some changes in there.

A roadside shaft opened up last year and has been infilled, so stuff is moving.
Place is ruined in my view anyway with the rock dust b
Topic: What's your favourite digging tool? I've just found mine!
royfellows

Forum: General Chat   Posted: 26/03/2015 20:46:03   Subject: What's your favourite digging tool? I've just found mine!
From my personal experience the most useless thing in the world is a conventional shovel.
I have moved tons of stuff with a gardening trowel, its a lot more effective than you would think and ca
Topic: Life of a lithium ion battery?
royfellows

Forum: Lamps & Lighting   Posted: 26/03/2015 20:33:33   Subject: Life of a lithium ion battery?
Back again
Quality cells, at least 500 discharge/ charge cycles.
One UG trip a week, 52 weeks in a year, 52 X 10 = 520 cycles
Store under cool conditions, never leave idle for long per
Topic: Life of a lithium ion battery?
royfellows

Forum: Lamps & Lighting   Posted: 26/03/2015 20:26:54   Subject: Life of a lithium ion battery?
[quote="John Lawson"]
The point I was making is that other than small lithium ion cells, these batteries seem to have an extraordinary long life.
I was hoping that either you or Simon might
Topic: Cwmorthin - changes to access system
royfellows

Forum: North Wales   Posted: 26/03/2015 14:36:46   Subject: Cwmorthin - changes to access system
Looks as though you have thought it all through Mate, good luck with it all.
:thumbsup:
Topic: Cwmorthin - changes to access system
royfellows

Forum: North Wales   Posted: 26/03/2015 12:14:36   Subject: Cwmorthin - changes to access system
[quote="RockChick"]A few questions on this:
Are you planning on leaving a key inside in case anyone needs to come out separately to a group/looses the key underground? clearly there's the potent
Topic: Fellows lamps forum.
royfellows

Forum: Lamps & Lighting   Posted: 26/03/2015 09:54:16   Subject: Fellows lamps forum.
I have just done some duration tests which are rather exciting, it went for over 12 hours on Standard which is over 200 lumens, and over 6 hours on middle mode which is over 500 lumens, from 2 cell po
Topic: Life of a lithium ion battery?
royfellows

Forum: Lamps & Lighting   Posted: 26/03/2015 08:58:46   Subject: Life of a lithium ion battery?
Speleo Technics wound up when its owner retired, the quality of FX Ion will depend on the quality of the cells that were used, as described in postings above.
Unless someone has insider knowledg
Topic: Fellows lamps forum.
royfellows

Forum: Lamps & Lighting   Posted: 25/03/2015 17:20:47   Subject: Fellows lamps forum.
[quote="Roy Morton"] and may your 'Magic Dragon' never go puff:lol:[/quote]

powering up the second one built find that I wired supplementary driver circuit backwards, but not go "puff" than
Topic: Life of a lithium ion battery?
royfellows

Forum: Lamps & Lighting   Posted: 25/03/2015 17:17:39   Subject: Life of a lithium ion battery?
[quote="steve turbo"]from personal experience of ultrafire 18650 batterys ,do not use this crap. if bought with their brand of charger they go on fire .very lucky i forgot my wallet one day ,or no mor
Topic: Life of a lithium ion battery?
royfellows

Forum: Lamps & Lighting   Posted: 25/03/2015 16:25:16   Subject: Life of a lithium ion battery?
My interest now being hooked........
Anyone have precise tech info on the Oldham setups?

I am thinking of the answers to such questions as "is there protection circuitry in the power p
Topic: Wheal Owles - New Poldark Series
royfellows

Forum: South West England   Posted: 25/03/2015 12:48:50   Subject: Wheal Owles - New Poldark Series
Same in lead mines Roy, think its the low ph of the water.

Ladders up to Llanrwst from Parc 2 where suspended by a tape round a corroded rung until I overhauled it. When it was freed the ru
Topic: Life of a lithium ion battery?
royfellows

Forum: Lamps & Lighting   Posted: 24/03/2015 20:45:10   Subject: Life of a lithium ion battery?
It does make one wonder. I use Sanyo which are OEM, they are re-branded into a lot of the reputable makes and also used in a lot of laptops.

I bought a netbook computer SH of eBay about 3 y
Topic: Fellows lamps forum.
royfellows

Forum: Lamps & Lighting   Posted: 24/03/2015 20:41:02   Subject: Fellows lamps forum.
I am stuck for delivery of a load of XMLs so decided to put another D1200 together, such is my confidence!

I put the test model on at standard mode about quarter to eight this morning and j
Topic: Life of a lithium ion battery?
royfellows

Forum: Lamps & Lighting   Posted: 24/03/2015 20:34:07   Subject: Life of a lithium ion battery?
I would say its mainly charge/ discharge cycles with better quality cells lasting longer than JunkFire brands. Oldham will of course fit good quality cells and its reasonable to expect an extended lif
Topic: Fellows lamps forum.
royfellows

Forum: Lamps & Lighting   Posted: 23/03/2015 15:40:31   Subject: Fellows lamps forum.
The Magic Dragon

I am now testing the first of the Dragon 1200s, "The Magic dragon", so christened because it really is magic.
An old say is that "There is never a second chance to mak
Topic: Old shaft near Upperwood Circa 1920s (photo)
royfellows

Forum: Midlands   Posted: 22/03/2015 17:11:50   Subject: Old shaft near Upperwood Circa 1920s (photo)
I had to move up the field which is south towards the first house to take it at what I thought was the right angle from memory. If I had your original with me I would have been nearer the house to ge
Topic: Access at Craig Y Ddinas silica mine
royfellows

Forum: South Wales   Posted: 22/03/2015 17:03:28   Subject: Access at Craig Y Ddinas silica mine
But no indication as to who owns it?
Topic: Welsh government planning to clean up mines
royfellows

Forum: Mid Wales   Posted: 21/03/2015 20:23:49   Subject: Welsh government planning to clean up mines
[quote="John Mason"]Some interesting ideas there Roy - Pugh's has ever been an ochre-ridden nightmare. But the worst problems are associated with risings up the Ystwyth Fault. I find it hard to imagin
Topic: Old shaft near Upperwood Circa 1920s (photo)
royfellows

Forum: Midlands   Posted: 21/03/2015 20:21:59   Subject: Old shaft near Upperwood Circa 1920s (photo)
This is hopping field above hopping pipe adit. Camera position is wrong, but there is your shaft and ground looks right.

[link]100314[linkphoto]100314[/linkphoto][/link]

I would
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