Solved: temperature control

I am very pleased. For years, now, I have striven to develop a clean and simple temperature control algorithm for my coffee machine which gets it to a stable temperature in the minimum possible time. This weekend, I cracked it: two minutes to a stable 95°C on my Gaggia Baby Class with no oscillations at all1That’s not quite all that is needed – the brew head needs bringing up to temperature as well. But that’s a different topic and I’m still working on it. Two minutes is also not an absolute minimum because the boiler power can be increased. Also a topic for another day. For the purposes of this post, we’ll use the stock 1350W the machine shipped with..

This is how I did it…

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1. That’s not quite all that is needed – the brew head needs bringing up to temperature as well. But that’s a different topic and I’m still working on it. Two minutes is also not an absolute minimum because the boiler power can be increased. Also a topic for another day. For the purposes of this post, we’ll use the stock 1350W the machine shipped with.

See how these Christians love each other

I would hope that anyone who has experienced any significant measure of the grace of God would be able to agree that the phrase “fight fire with fire” isn’t really the sort of thing we hear Jesus saying. I would hope that we’d be more inclined to fight fire with fire extinguishers. To pour oil on troubled water. But, I wonder, is this enough? Might it be that one person’s “fire extinguisher” is another’s “fire” or, at the very least, the other’s “water cannon”? Might one person’s oil on “troubled waters” be another’s oil on a “raging blaze”. Recent escalations in the disagreement between a number of prominent (on social media) Christians seem to suggest so.

Want to know what I’m talking about? Have a look at what Adrian Hilton is saying about Jayne Ozanne and vice versa. But, for goodness sake, don’t join the fray!

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A vote of confidence

Who can comment with any certainty on the current state of British politics? In the surge of the present media maelstrom, so many words and phrases have bubbled briefly to the surface before sinking again out of sight. Chaos reigns. But in the chaos, I think some things can clearly be said and, indeed, need to be said to call our leaders to account. Indeed, it is the very chaos which most excites comment.

Where does this chaos originate? Why could calm not have followed in the wake of last week’s referendum? Indeed, would a period of calm reflection not have been exactly the thing that was needed in the circumstances? Do we not, in emergency situations, praise the people who are able to keep their heads and help everyone else to respond calmly? What airline would want the crew to ran about screaming and inciting chaos in an emergency? Or to begin fighting each other? Indeed, cabin and flight crew are trained to do exactly the opposite: to keep their cool and to help everyone else to respond in a calm and ordered manner.

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Gaggia boiler specs

So, you’re obsessed with implementing the perfect temperature controller for your Gaggia Baby Class (or Classic or any other derived model)1Oh, you’re not: is it just me then?. You’ve realised that you really need to know the values of some important parameters and the only easy way to get those is to take the boiler apart. And you don’t want to do that2Are you sure you don’t? If you do, you can take the opportunity to improve the brew head temperature.. The good news is I’ve done it for you3Where I also took the opportunity to improve the brew head temperature.. Here is everything you need to know4At least, I hope so: I don’t want to take it apart again.: Continue reading

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1. Oh, you’re not: is it just me then?
2. Are you sure you don’t? If you do, you can take the opportunity to improve the brew head temperature.
3. Where I also took the opportunity to improve the brew head temperature.
4. At least, I hope so: I don’t want to take it apart again.

Improving Gaggia brew head temperature

Over recent weeks, I have wasted invested a lot of time investigating the Gaggia boiler thermodynamics. (All part of my master plan to have the entire machine at a stable temperature inside 2 minutes from power on.) A major obstacle to getting a stable temperature quickly is that the brew head takes for ever to warm up. Whilst thinking about this, I hit on an idea for improving the heat transfer from the aluminium boiler shell to the brew head: put heat-sink compound in the join between the shell and the brew head. Continue reading

Scary promises

Yesterday for morning prayer, we had the story of Caleb and Joshua and the spying out of the promised land from Numbers 14. I was struck by how the Israelites were so fearful of entering the promised land, full of God’s bounty and, instead, wanted to go back to slavery in Egypt. I think we are often like this: God’s generosity is an unknown quantity and feels scary. Egypt is unpleasant but it is a known quantity and that feels safe.

Isn’t this true? Do we not all sometimes think “Better the Egypt you know than the promised land you don’t”?

What is so sad about the Numbers 14 story is that the promises were lost to the people. That entire generation had to pass away. Forty years had to pass by before God’s promises could, finally, be fulfilled.

Oh Lord, help us to trust you and not to rob ourselves of the bounty you have laid up for us.

Covenant parish community

Having previously set out some of my thoughts about what we were calling “parish monasticism”1We’re now calling it “new monasticism in the parish context” because that’s what we really mean – even if this name is a little bit of a mouthful. The emphasis here is on new monasticism to be clear that “parish monasticism” is not a different thing to “new monasticism”, but, rather, an expression of new monasticism in a particular context., the next question is how to proceed practically. It’s all very well to talk about doing this – but how do we actually begin?

This week, I began a foray into new monasticism with my church at our annual parochial church meeting. My thinking was aided by discussions held around an upcoming New Monasticism conference in October in which we pondered what “new monasticism” actually is. Like most movements of the Holy Spirit, this one proves difficult to pin down. However there was broad agreement around one thing: having a common rule or rhythm of life. This set me wondering as to whether this is a good place to begin.

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1. We’re now calling it “new monasticism in the parish context” because that’s what we really mean – even if this name is a little bit of a mouthful. The emphasis here is on new monasticism to be clear that “parish monasticism” is not a different thing to “new monasticism”, but, rather, an expression of new monasticism in a particular context.

The great wonky veg debacle

Wonky veg has been all over social media recently since ASDA began selling their Wonky Veg boxes. ASDA is now promising to roll these out nationwide. I first became aware of the great wonky veg waste problem through Hugh Fearnley-Whittingstall and the BBC show Hugh’s War on Waste. The problem has been that supermarkets will only sell the most regular-shaped vegetables, whilst nature stubbornly insists on producing vegetables of all shapes. This results in farmers having to destroy large parts of their crops because they simply cannot get the supermarkets to sell the “wonky” vegetables. Bad news for the farmers and bad news for a planet in which there are people starving.

So, everyone is excited to see the supermarkets beginning to move on this issue. However, at this point I want to sound the alarm bells. This latest move could prove disastrous. The trouble with demanding that supermarkets sell wonky veg is that we fail to see the real problem, which is more about overproduction than about wonky vegetables. The real problem is that people in the UK eat far less veg than the farmers produce. So a lot of veg has to be destroyed regardless. That it happens to be the wonky veg which is destroyed is almost a side-issue.

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