Search found 340 matches

by popeye
March 30th, 2021, 7:03 pm
Forum: Grinders
Replies: 1510
Views: 180705

G-IOTA / DF64 espresso grinder

The review on the UK forums mentioned a single phase AC motor with a start capacitor. Does anyone know if that can be driven by a variable speed drive? It seems like it might be able to be speed controlled, especially since the internal wiring is simply that - wiring. But I'm not smart enough to fig...
by popeye
September 23rd, 2019, 1:29 pm
Forum: Grinders
Replies: 5
Views: 1752

Ditting Lab Sweet vs. Bunn burrs

I got the SSP burrs and I run them at a (variable) low rpm and they are crazy clean. For a comparison, I use a baratza vario w/ steel burrs (considered pretty good for drip) at our roastery for cupping and V60s take about 30-40 seconds to draw down at the end of the pour with that grinder.
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by popeye
May 30th, 2019, 2:00 pm
Forum: Coffee Roasting
Replies: 17
Views: 1680

Sweet Maria's Arrival Dates

Nobody can really offer "fresher" coffees. Coffee from a certain origin gets harvested at a certain time of the year. Doesn't matter really when it ships, arrives, etc... if you are roasting Ethiopian coffee right now it was picked nov 2017 to feb 2018. The coffees that were just harvested nov 2018 ...
by popeye
May 27th, 2019, 1:58 pm
Forum: Coffee Roasting
Replies: 17
Views: 1680

Sweet Maria's Arrival Dates

It makes sense for them because they need to keep origins in stock. If they post all of their ethiopia in summer/fall, and it's gone by winter, where is their customer going to go? To some other site to buy greens that have just been listed (perhaps sans arrival date). So they probably do a lot of w...
by popeye
May 16th, 2019, 6:02 pm
Forum: Coffee Roasting
Replies: 17
Views: 1473

Replicating a roast

I've matched* roasts and achieved different flavor profiles precisely by varying the heat transfer characteristics of my roaster. In other words, the same BT profile but different drum speeds, airflows, and gasflows will certainly mess with the flavor of the beans. I've actually fantasizing about cr...
by popeye
May 11th, 2019, 4:04 pm
Forum: Espresso Machines
Replies: 12
Views: 1073

Decent espresso DE1 in los angeles

Oh man, I'm in Corpus. If only i could get you to bring the monolith flat down here!
by popeye
December 26th, 2018, 1:55 pm
Forum: Coffee Roasting
Replies: 69
Views: 2639

EBay Burkert Digital Control Valve

What are neutral gases? The Burkert website says the valve is rated for neutral gases (and liquids on request). Does that mean non-corrosive gases? Someone versed in chemistry want to chime in on long-term use of this valve with propane or natural gas?
by popeye
December 10th, 2018, 1:46 pm
Forum: Espresso Machines
Replies: 1
Views: 243

Anyone have a DE1PRO in the Austin, TX area?

Got a DE1+ (non-pro) down here in Corpus. Let me know if you come down
by popeye
September 8th, 2018, 12:36 pm
Forum: Coffee Roasting
Replies: 160
Views: 9184

Are today's small batch roasters too inconsistent?

I've been writing roast control software for over 4 years now. I've actually forgotten why I made some design decisions that I did. But here's why ROR and ROROR (first and second order derivative control) is generally not used. BT control requires one data point - the current BT ROR control requires...
by popeye
September 6th, 2018, 4:09 pm
Forum: Coffee Roasting
Replies: 160
Views: 9184

Are today's small batch roasters too inconsistent?

roasting software does follow ROR. Most software (I know ours does) works on a combination of PID and algorithmic control. A PID is a good tool when you don't know much about the system. Algorithms are a better tool when you know specific responses of the system. PID control incorporates Proportiona...