skydragondave Senior Member Joined: 18 Feb 2013 Posts: 168 Location: Ontario, Canada Expertise: Professional
Espresso: Commercial Only Grinder: Commercial Only Roaster: Has Garanti HG5
Posted Tue Nov 26, 2013, 8:26pm Subject: Re: My Appia modding thread (was Automation of HX cooling flush?)
One of my clients has an Aurelia II. It's the only commercial machine I found so far that benefits from conical group gaskets. If you enjoy tinkering with your machine that's great but to be blunt if you're still struggling to make a perfect shot on a stock espresso machine you're going to reach your intended destination much faster by training with a pro barista before you tinker with your machine. I'm not saying don't tinker; I do it all the time in my shop. But you need that solid foundation to guide your efforts and working with the right barista to get a good shot on any machine is a lot of fun and the best bang for your buck. All the best
Posted Tue Nov 26, 2013, 8:38pm Subject: Re: My Appia modding thread (was Automation of HX cooling flush?)
At this point it's not about trying to correct bad shots. The coffee I produce is good, or so says my wife (I don't drink coffee which I'm sure is slowing my progress).
I haven't got the shots to the point where my wife and mom can drink the espresso straight without making a face - but I'm pretty sure the last time my wife tried a shot of espresso in the best shop in town she made the same face so I think they're just latte drinkers.
I'm just trying to see if it can get any better. :)
I've tried looking for a barista class in town but the closest I've found is a 'home espresso' class where they play with Silvias.
Closest pro barista class I've found is in Vancouver (1000km/600miles) away.
I've managed to set up a coffeegeek meet in my city and attracted the attention of the 2013 Canadian Barista Champ who will be attending and giving some training so hopefully that angle is being worked as well.
Thank you again for the tips. Tough love I know. :D
Posted Mon Apr 7, 2014, 7:28am Subject: Re: My Appia modding thread (was Automation of HX cooling flush?)
Doing a little more work on the machine. Updating some of the components.
1) These are a little pricey but work much better than the circuit I was using. They sell both a single RTD and a dual RTD version on ebay. Got them working on the lab bench today. Figuring out how to solve for Temperature with the Callendar-van-husen formula was fun (math > me).
2) This display with be a lot prettier. I really like the look of OLED displays.
3) Going to start trying to play with pressure profiling. I have a 150psi (10.35bar) pressure sensor (might be cutting it a little close... but I don't think you want to extract at more than that anyway right?) and a digital AC dimmer to try to control the rotary pump speed. I think the ADC resolution on the arduino should be fine for this.
4) I might just take out the cooling flush routines, I never use them anymore.
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