Cafelat Robot User Experience - Page 250

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#2491: Post by jpender »

It's really hard to discern that column of air between the piston and water in the video of the transparent PF. If you start with 1cm or less of space between the water and the top of the basket and apply 6 bar or more it's going to be a pretty thin column, something on the order of 1mm. And it will be very hot, moist air as well. At the same time, the distance between the basket and PF is also pretty small, at least up higher on the basket. I really don't know how to calculate the whole heat transfer problem. That's why I'm measuring examples instead.

One thing to consider is that a preheated PF will start having an effect as soon as PF and basket are mated whereas a preheated piston won't matter as much until the shot starts.

I haven't collected enough data to say anything definitive. I'm just another monkey in the jungle. But it "seems like" preheating the PF has a significant effect upon the initial brew water temperature whereas preheating the piston has a greater effect upon maintaining the temperature over the course of the shot.

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#2492: Post by yakster »

Freddofl wrote:I aksed this in an older thread but based on your experience with the robot do you guys think that a small pad heater for reptile tanks applied to the piston would work to warm it up without presoaking hot water?

Example: ... ater-95290
This idea doesn't strike me as practical, I'm not sure a reptile pad would get the piston hot enough to make a significant difference. I could be wrong, and I find pre-heating the piston unnecessary for my tastes, I just preheat the portafilter and basket on top of my kettle while heating the brew water; this doesn't waste any water beyond any evaporated water vapor.

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#2493: Post by mkane »

^^^^^^^^^this. And after the first the second may taste different.

The first and foremost reason we purchased the Robot is ease of use.


#2494: Post by Charlemagne »

In my experience:
  • Dark Roasts - No preheat necessary, I've even been using 97C water to tame bitterness. Super low effort for great shots.
  • Med Roasts - Preheat portafilter and basket in kettle, 100C water. A little more effort, but worth it.
  • Light Roasts - Preheat portafilter, basket, and piston for the best flavor, 100C water of course. A lot more effort to preheat everything, but at least it's possible to get a good shot from light roasted beans this way. Most times I don't feel like the effort it is worth it and I enjoy my light roasted beans in a pour over.


#2495: Post by Uno » ... hare_sheet

The new levelling tamper and mittens are available!

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#2496: Post by patrickff »

Uno wrote:The new levelling tamper and mittens are available!
Now Paul needs to make boxing gloves. But in all seriousness, these mittens will handling a little bit more comfortable.


#2497: Post by dak »

New toys ordered and stocking up for the apocalypse!



#2498: Post by violin_geek123 »

Beautiful - I have also ordered the mittens and the leveling tamper!
Brian Hong

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#2499: Post by coffeepress »

Seems they ran out of the leveling tamper. Nowhere to be found on the site. They should just show it as sold out. Same happens with the polished aluminum robot. They just deactivate the product which makes one thing something is wrong.


#2500: Post by grind727 »

mkane wrote:The first and foremost reason we purchased the Robot is ease of use.
Amen. I'm constantly amazed at what I can successfully pull on my Robot without any tweaking. Case in point, I've been struggling to dial in a bag of B&W Rodrigo Palaez on my Londinium so I gave the Robot a whirl this morning. It wasn't the best shot, a little fast and spurty, but still awesome, delivering lots of cherry, almond paste, and a bit of chocolate that I've not tasted on the Londinium. No preheating, no fiddling. Just grind, pour, and press. I feel like some people are going out of their way turn something that's wonderfully simple and elegant into something difficult.
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