While driving to the space we came up with the idea of making the hearth
run on bottled gas, which I suspect will be more workable than having
mains gas installed in the space, and the associated issue of having to
plumb it in at one site permanently. I *think* it would also mean
avoiding those working on repairing it having to be CORGI registered.
The hearth appears built to take mains gas, with an optional oxygen
tank. Mains gas is (apparently) between 22-30mbar (peak 75mbar). A tank
of propane is (apparently) 700 to 13600mbar. So it'd need a pressure
I've also found an old coin-payment gas meter on ebay. It takes
shillings and sixpence, but could be modified to take pound coins and
50p maybe, or else get an electronic valve and use the coin unit from
the old gambling machine. The idea here would be to ensure there was
always enough money to get the bottle refilled by charging for gas
The problem with doing it electronically is finding a flow sensor. I
couldn't see one cheaply, and unless anyone has objections or better
ideas, I'll try and grab the ebay meter which ends in 3 days.
Billy also suggested using the large fans out of the HellBench (laminar
flow bench) to build an extractor for it.
We should keep an eye out for spare bits of metal ducting we can use to
keep it ventilated to outside with.
It'd probably be good to get it on some locking castors too.
It's currently by the bellow-hearth. I think the new one will surpass
the bellows one in all ways once it's working.
I'd be keen to help in getting it running, obviously. :)
Also thanks to Kal we have a wide selection of welding-rod sizes (some
may be contaminated/damp), some graphite crucibles and a few other bits,
which I'm sure Kal will go into with any usage advice/constraints. :3
good job btw
Kal stuck his neck out for the space here convincing the uni to let us
take what we did and deserves thanks for his effort! :)
The engineer present was lovely and enthusiastic, and seemed eager to
see these things being potentially re-used rather than scrapped. He was
pretty much loading things into our arms. Small things that might not be
noticed by admin, but things. :)
I think Billy may have persuaded him to come visit the space too!
Well done folks
I am curious, had he already got a quote on how much they'd give him for
the lot? Steel and iron, traders buy at no more than �200 per tonne. So
about 20p a kilo! Aluminium only 50 to 70p/Kg or so.
There's probably some money in the copper windings of the motors and
coils, but not a lot since they're a pain to recycle easily.
But he did seem pretty stuck on it going, so guessing he wouldn't have
sold them direct.
Don't suppose you know which scrap merchant they're using? Could maybe
still get some of the interesting bits if we're willing to pay? Not all
scrap merchants will sell, but you never know.
We'll just get the hearth working as-is and fit in some sort of
Anyone got any castors with brakes on? Can use some of the angle iron
that's about to make a trolley for it with space behind for bottle
storage and extraction gear.
On 17 Aug 2011, at 13:44, Sci <s...@sci-fi-fox.com> wrote:
> Okay, the pay-meter on ebay is at £12, and that's getting to more than I
> want to gamble on it being both usable, convertible AND functional.
> We'll just get the hearth working as-is and fit in some sort of
> pay-timer later.
> Anyone got any castors with brakes on? Can use some of the angle iron
> that's about to make a trolley for it with space behind for bottle
> storage and extraction gear.
> ~ Sci
> On 15/08/2011 21:42, Sci wrote: