Bitcoin: better than a Euro bank? (by alaric)

Ah, Bitcoin. I've written about its security and regulation mechanisms before, invested in it just before the June 2011 bubble; as the bubble peaked I sold enough at the higher price to cover my meagre initial investment, so didn't feel too worried when the bubble burst - the bitcoins I held were, essentially, free.

I could have made more money if I'd known when it would burst (indeed, at the time, I wasn't sure if it would ever burst; that ramp could have been the start of a worldwide shift to bitcoin as the de-facto international currency, for all we knew); I could have sold all my bitcoins right before the drop, then used the proceeds of that to buy back at the very depths of the crash, and netted myself a heap of bitcoins that would be worth an astronomical amount right now.

Hindsight, eh? Read more »

Sultanas (by alaric)

THE SCENE: Jean is eating a chelsea bun.

JEAN: "I don't like sultanas."

ALARIC: "They're... really sad to hear that. They say they tried as hard as they could to be tasty for you."

JEAN: "I absolutely hate them."

ALARIC: "Oh no! Some of them are crying now!"

JEAN: "Well, I'm eating them anyway."

ALARIC: "Ah, that's cheered them up a bit!"

JEAN: "What, even though I'm killing them?"

ALARIC: "Oh, you're not killing them, you're liberating their trapped souls."

JEAN: "Really? Well, they'll just be 'tanas' then, without their 'souls'."

Day 4 of making the ladder (by alaric)

I wasn't scheduled another project day until later in the month, but I had some spare time and the opportunity to grab a volunteer (my father in law, Len) to help, so yesterday I mounted the ladder on the wall!

(Background: Days 1, 2 and 3).

The first step was drilling the holes. I held the ladder up against the wall, and checked it with a spirit level, while Len pencilled the holes in.

Then it was time to drill. I'm very fond of my SDS+ drill (as I have mentioned previously) so it was good to have an excuse to get Vera out again:

Without further ado, I started to drill:

However, disaster struck on one of the holes - the bit suddenly went sideways, into some kind of void inside the concrete blocks of the wall. Doh! I fitted a smaller drill bit and managed to drill back into the route the hole was supposed to take, then drill that out so the bolt could go in straight, but now it was in the middle of a much larger hole than intended so it would just rattle around and not hold anything.

Thankfully, I over-engineered the design so that it had far more mountings to the wall than it really needed, so none of them were all that critical. What I did was to jam a piece of wooden dowel into the misaligned part of the hole to fill much of the space, then squirt a load of fine mortar (2 parts sand to 1 part cement) into the rest. More on that later.

With that done, I could fit the anchor bolts to the ladder. The anchor bolts consist of a normal-seeming bolt that goes through the ladder, into a sleeve that goes into the wall. The sleeve is a metal tube, but at the far end is a conical nut that the bolt screws into. When the bolt is tightened the conical nut is pulled into the metal sleeve, forcing it to expand to tightly squeeze against the surrounding masonry.

So to start with, I put all the bolts through the ladder and screwed the sleeves on a few turns to hold them in place:

Then we lifted it up and guided the bolts into the holes and wiggled it into place. Of course, as it's nearly impossible to drill holes into masonry accurately, the holes were a few millimetres out from where the holes in the ladder are, so beyond a certain point the bolts started to chafe against the masonry and had to be tapped into place with a mallet:

All except the hole packed with mortar, of course, which the bolt just slid into squelchily.

Then we tightened the bolts - all except the one in the wet mortar; I'm going to give that a few days for the mortar to cure before I tighten it, otherwise there's no resistance to the expanding sleeve and it'll just squeeze the mortar out.

And then it was time for a test.

After gingerly doing a few pull-ups on the ladder, I climbed onto it. And then to check it's really secure, I put as much strain on it as I could by stretching myself out to get the maximum torque:

This failed to tear it out of the wall, so the next step was to actually climb up to the roof:

See how the top rung protects the gutter? That's careful design, that is! 🙂

However, it was cold, damp, and slimy up there, so I climbed back down and had some lunch. After lunch, I put some sealant around the edges of the mounting flanges, to prevent water getting in behind them where it might soak into the wall through the bolt hole, or lurk around and make the flanges rust. Also, I like sealant and will use it whenever I can:

This stuff is "frame sealant", which is specifically designed to join metal, wood and masonry outdoors, as opposed to the stuff you use in your bathroom. It's extra sticky to bond to awkward surfaces and extra stretchy to account for thermal expansion differences.

I also cut some small cubes of wood and pressed them into the open ends at the top of the ladder, packed with plenty of sealant. I tapped them in with a hammer to about a centimetre below the open end and squeezed more sealant in on top, and domed it slightly to keep rain from pooling.

Now that ladder is done, as soon as I get some time I'm going up there to secure part of the plastic sheet that's flapping up, and have a general poke around to see if I can find any holes to seal. With more sealant! Yay!

Also, I need to touch up the paint on the ladder in a few spots where I dinged it moving it around. Whoops!

Day 3 of making the ladder (by alaric)

Well, after two days of prior work on the ladder, yesterday I settled down to another day.

I started by welding together the second side of the ladder, to match the first. With that done, I now had the two sides of the ladder, ready to join them together with the rungs:

With that done, I carefully aligned everything on the welding bench and ground the welds on the inward sides down so that the rungs could fit on nicely:

I set the rungs back half a centimetre where they were attached at the same point as a spacer, so they were welded both to the uprights and to the spacers, as I felt this would be stronger. The pieces of wood you can see under the rungs are maintaining that spacing.

Now, as I mentioned before, I'm not very good at welding; I can make things structurally sound, but not pretty, because my welds often go wrong and I have to go over them again. This usually leads to big, messy, welds, and on a couple of occasions with this job, I actually melted a hole in the metal and had to patch it up. Here's one particularly terrible weld:

I ground the lumps around the edge of the hole down:

Then welded a metal plate over it:

This, in contrast, is I think the neatest weld I've ever made:

With all that done, the ladder was actually a ladder:

I sanded it down to get the weld gunk off, then washed it thoroughly in white spirit to remove the grease the metal came covered in, and laid it out in the kitchen to paint:

Then I gave it a priming coat and left it to dry overnight (I did it in the kitchen so it would be warm and dry overnight, rather than the cold and damp of the workshop):

It'll need another couple of coats of paint, and I need to cap the open ends of the uprights at the top, then I can mount it on the wall.

Part of welding that I always find quite profound is the way that a bunch of bits of metal, initially held together with clamps, and gingerly handled in case it comes undone, slowly transforms into a structure made of solid steel. This was driven home with the ladder project when, finishing the welds on the rungs, I found the best way was to lay it on its back like in the last photos and sit on it so the welds were flat (the best orientation, as molten metal likes to run away when the weld is vertical) and comfortable to reach; it didn't even flex!

I can't wait to be using it to get up on the roof. There's a flap of plastic sheeting lifting up in the wind and letting rain in, and I can't reach it in any other way...

Continue to day 4...

Sealing up the workshop’s eaves (by alaric)

I keep moaning about how the workshop roof leaks, causing rain to drop down on all my nice tools and supplies. But that's not the only problem with the workshop roof!

The workshop is basically a set of walls, with the roof resting on top. The roof is a large, flat, box with the bottom open (exposing the rafters that give it strength), slightly larger than the outline of the walls. The rafters rest on the tops of the walls, and the roof hangs slightly over the walls.

As you may have guessed if you've been following that, this means there's gaps all the way around the edge of the roof. Howling winds blow through them. These holes are enormous at the ends of the building, where the roof overhangs further; twenty centimetres high and occupying most of the length of the walls (interrupted only by the rafters themselves), but I've pinned up sheets of plastic to temporarily block them until I get around to cutting lots of rectangles of wood to properly cover them with.

Along the longer walls of the building, the gap is more like a centimetre, but again more or less the entire length of the building (which is somewhere around ten metres).

And the worst part is, the rear wall is close to a row of trees, which are covered in ivy. And the ivy has found the gaps and keeps oozing its way into the roof.

And as well as being faintly disturbing, the ivy also drops foul grime down onto my stuff.

So, although stopping the roof leaking is a long-term project I work on when I get entire days to spend building the ladder to get up there, I've been fighting the ivy when I've just had a few hours here and there. I've been cutting bits of thin wood (left-over cladding) and nailing them in place over the larger holes, and then liberally applying left-over bits of sealant to all the edges (I suspect the ivy attacks a gap if it sees light, so hopefully this will make it lose interest). The black marks on the ceiling are damage made by ivy I've torn out:

There's no less than three different colours of sealant there - two different cartridges of brown "frame sealant", one light and one dark, and some leftover bits of white stuff from the bathroom! Unbelievably, it looks miles neater than the mess of cobwebby, grimy, ivy that was there!

I have to climb right up into the eaves to get most of the gaps, however. This picture is not particularly clear, but there's a thin plank of wood that I've nailed down to the top of the wall in order to cover the two-centimetre gap between the top of the wall and the vertical wooden beam at the back, then I've run sealant all around all the gaps and joints:

I quite like working with sealant (I've been sealing gaps in the bathroom, and replacing existing manky mouldy sealant - and doing it neatly, unlike the ghetto job I'm doing in the workshop), and it's nice to think that I'm keeping out all those draughts and grubby plants! I want to properly seal all the gaps in the workshop - and then introduce an extractor fan over the welding bench at one end, and an air inlet vent at ground level at the other end, with a small heater under computer control so I can regulate the temperature and keep the humidity down in here!

I've also started varnishing a bit of scrap MDF that, I have realised, is exactly the right size to make a shelf to go over my workbench (not the welding bench, the one where I have the column drill). That will give me a place to put loads of things that currently sit ON my workbench for lack of a shelf. Also, I'll be able to fit a decent light to the bottom of the shelf; right now, when I work at the workbench, I cast a huge shadow over whatever I'm doing.