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Bibliomansion/EspressoMachine
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== July 2016 Status and Notes == Finally got things wired back up and successfully pulled some shots. Bryan detached the copper tubing and external european high-pressure pump and reconnected the original ("vibrator") pump, which seems to provide plenty of pressure. If we want more pressure we could get a compatible upgrade like this one on amazon: [https://www.amazon.com/Ulka-EX5-Vibratory-Pump-Dramatically/dp/B00B8KBVZE Ulka-EX5] The Silvia casing still hasn't been re-attached, so the machine isn't super safe to use. It would be good to add electrical tape in a couple places before re-assembling, but otherwise it seems to be working well enough that we don't need internal access any more. The steam wand knob was stuck, but after turning the machine on it got un-stuck; maybe the metal needed to heat up? The PID settings (tuning, etc) were left as-is, except the set value (target temperature) was changed to 223 F (from 225 F). The steam button does set the set-point to 300 F, but the PID doesn't keep the boiler current on above 260 F or so... not sure if B wasn't following the directions correctly, or maybe there is a safety mode enabled in the PID controller? Note that the PID isn't perfect, it seems to way over-shoot when re-heating after shots, but works well enough. You can flush water through the system to cool it; not sure what effect this has on the actual temperature of water coming out the spout. Didn't check what the current PID mode or parameters are... if we wanted to start from scratch we could start with these values from [http://www.vogie.com/coffee/tuning-log.html vogie.com]: Set duty cycle back to 1 second (from 10 seconds) Set P=3.7% Set Ar=7.50% Set P=3.7% I=85.8S, D=16.5S, AR=7.50%) The current screen (aka, where the portafilter attaches) has a big old nut in it. Others have complained about this and modded the screen to accept a more flush screw, but this might require a lathe. Had trouble adjusting the grinder fine-ness. Eventually took the grinder apart partially to clean it out, which greatly helped, and let us go from "as fine as possible" (when spinning by hand could feel the burrs hitting each other) and step back a quarter-dial or so. Had lots of trouble getting the portafilter in the machine when we filled the basket to the drop and then tamped (leaving the grinds about 2mm below the lip). Maybe because of the screen screw, the portafilter won't even engage or start locking with this much coffee. Needed to only fill up to about the indent line in the basket and then press, which maybe isn't enough coffee. Need a deeper (double) basket? It's hard to add a fixed about of coffee to the grinder and get it all out. If you don't let the grinder run a long time, it won't finish grinding (slower grinding the finer the grind). A lot of grinds get stuck in the little gap between the burrs the and cylindrical holding ("dosing"?) area. Might be worth reading the manual to see what it says about that.
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