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, 9:26pm 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, 9:38pm 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, 8:28am 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.
Groundz Senior Member Joined: 13 Jun 2014 Posts: 5 Location: Canada Expertise: I like coffee
Posted Mon Jan 5, 2015, 8:49pm Subject: Re: My Appia modding thread (was Automation of HX cooling flush?)
Hi General Appia design. I picked up a Appia 2012/13 model . ( another black tar mess internally ) sold as Excellent condition for $1200 CAD ARGG RE: Preinfusion if that chamber in the previous post is the pre infusion my 1995 Premier has the same feature. RE: Grouphead- I was thinking of buying the Aurelia GH and putting it on the Appia . Then I noticed that the Appia 2 2014 model has a different GH than the 2008 version . SimonelliUSA site. Not sure why I got the older GH version on my Semi Automatic version. The mount is different for the newer GH . You might be able to order the steel plate . But probably more practical to mod it . As there's no release of a 1 group Aurelia ( which would be outa my $ range) This might be a cool mod to try? With Simonelli there's no literature on any feature details .. like what the newer GH is supposed to improve on. For $400 investment it might be nice mod , I quess the goal would be temperature stability , What do you guys think ?
Posted Sun May 3, 2015, 2:59pm Subject: Re: My Appia modding thread (was Automation of HX cooling flush?)
Sorry Groundz, don't know how I missed this back in January.
The only grouphead I'd try to transplant into this machine would be the Aurelia II T3 heated grouphead. But it also has a different mounting method and would have to figure out pid circuitry to keep it a the proper temp. Still don't think it's really worth the trouble. I'd only do it if somehow a parts Aurelia II T3 dropped into my lap for cheap.
As for the rest of my project, I kind of lost interest for a while, just recently started tinkering again.
Never did get the wifi data logging integrated with the rest of the project. The wifi chip I had been using wouldn't drop one of its communication lines properly so it was screwing up the communication of all the rest of the components. I've since received different chips that I haven't played with yet.
Finally got the zero cross detector part of my dimmer working only to find out that the triac on the board wasn't up to the task of the current running through an espresso machine motor. I have bigger triacs on order now.
I also found out that I misplaced the latest revision of the code I was running. So I lost all of the work I had done on showing all three rtd sensors and the pressure. Gotta reprogram all of that.
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