Search found 49 matches

by ethorson
November 25th, 2012, 6:49 pm
Forum: Tips and Techniques
Replies: 25
Views: 6134

Chronic ring/side/donut channeling solved.

I think that any change in the diameter of the basket is more dependent on the portafilter temperature than the basket temperature. When the portafilter is locked in place the concave basket lip is very tightly coupled to the portafilter rim. Since the portafilter wall is much thicker than the baske...
by ethorson
November 7th, 2011, 10:12 am
Forum: Espresso Machines
Replies: 27
Views: 1313

Multiple PIDs for More Temperature Stability

Port townsend is a few miles NW of the City of Milk and Coffee
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by ethorson
November 6th, 2011, 7:04 pm
Forum: Espresso Machines
Replies: 27
Views: 1313

Multiple PIDs for More Temperature Stability

I was asked this same question in a previous post on CG regarding the non-PID incantation of this machine. There is no flux capacitor, however it has an electrodynamic molecular compressor, free electron phonon generator, supercritical entropy amplifier, and confabulation augmentation. The three PID...
by ethorson
November 6th, 2011, 11:48 am
Forum: Espresso Machines
Replies: 27
Views: 1313

Multiple PIDs for More Temperature Stability

Here is my machine with PIDs for control of boiler temperature, group temperature, and shot temperature. I know this is a little excessive but at least I don't have to flush the group before a shot. {image}
by ethorson
October 31st, 2011, 10:42 pm
Forum: Tips and Techniques
Replies: 38
Views: 14306

What is a cortado?

I found that the Metropolis Coffee training videos provide a good distinction of the macchiato vs. the cortado ({link}). The cortado is my favorite drink prepared at home but espresso establishments usually don't know what it is so I order a macchiato, which most times turns out to be a cortado. It ...
by ethorson
August 2nd, 2011, 12:36 am
Forum: Espresso Machines
Replies: 27
Views: 2173

Question on HX temperature profile

I have added a few PID controllers and a timer in an attempt to stabilize my old HX machine. There is a PID to regulate the boiler temperature (top left in photo), a PID to regulate the group temperature (bottom left), and a PID that just measures the brew water temperature at the shower screen (rig...
by ethorson
April 27th, 2011, 6:38 pm
Forum: Grinders
Replies: 8
Views: 9587

Installing Mazzer Super Jolly burrs in a standard issue Mini

I am very pleased with the performance of the modified mini. It is solid, fast, and consistent yet an appropriate size for home use. I run a little less than a pound of beans per week and have found that the grind just needs to be adjusted when I change coffee and is remarkably consistent through th...
by ethorson
March 19th, 2011, 12:18 pm
Forum: Espresso Machines
Replies: 11
Views: 2270

Silicone o-rings

I have purchased silicone o-rings on eBay, which has a huge variety of sizes from various sellers. Here's an example: {link}
by ethorson
January 26th, 2011, 4:41 pm
Forum: Grinders
Replies: 8
Views: 9587

Installing Mazzer Super Jolly burrs in a standard issue Mini

There have been a number of posts here and at CG regarding using Super Jolly burrs in a Mazzer Mini ({link} and "Grind quality of Mazzer Mini E vs. Super Jolly?"). It appears that the Mini motor has enough power to drive the larger SJ burr set for low duty cycle home use, so I decided to do a
by ethorson
January 12th, 2011, 3:42 pm
Forum: Espresso Machines
Replies: 9
Views: 4949

Adding preinfusion to a rotary pump machine

A stepper motor with sufficient torque should be fine for pressure profiling. You may not even need a pressure transducer for feedback if you provide a way to move the motor to a home position on power up. By the way, on my other espresso machine I just put a knob on the pump pressure adjustment scr...