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kozesluk

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About kozesluk

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    Brewing Nicely

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  • Location
    London
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    photography, books, art
  • Occupation
    Coffee Machines Service Engineer

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  1. Yes. No need to replace, it works as it is supposed to. You can even see the contact 'click' back as the grinder slows down. In case you need to replace it you have to disassemble the whole thing. It's worth replacing the switch and rotary burr pressure spring at the same time. It usually takes 2-3 years in busy cafe to reach the need to do that...
  2. centrifugal switch. nothing to worry about (until it stops working, of course, but that is not related to the sound).
  3. 1) vacuum breaker has nothing to do with this. 2) most mechanical pressostats have deadband around 0.2 bar, anything over 0.4 bar is bit excessive, yours is fine. live with it, it won't affect the coffee taste/temperature as the system is not directly heated but the heat is exchanged and the final temperature is achieved by the circulation rate of the thermosyphon loop and radiation/convection cooling from the grouphead. if you want to easily get to the correct temperature: turn the machine on - as soon as you see the pressure rise above half bar purge a lot of steam out of the boiler to be sure that there is no more residual air (sometimes the anti-vacuums close too early) - after 20 mins the grouphead should be scalding hot, draw 150 ml from it and walk away. - 5 minutes later come back, do a short flush (40 ml max), prep your shot (should take around 1 minute) and just pull it straight away. the Appartamento and all other Rocket HX machines have quite well tuned HX system (properly sized restrictors and injection pipe length) so that it tends to idle at the correct temperature and only cooling flush might be needed after long idle (30 mins and more). stop trying temperature surfing and just pull the coffee.
  4. £5 man, you drink a lot of coffee!
  5. I would have this one if you want: https://www.imsfiltri.com/filtri/b702th26-5m/ haven't tested this particular type for capacity but IMS tend to grossly underestimate so 18g should fit.
  6. no-one wrote Suzuki GS500 here? cheap, simple engine, quite reliable, not too big, not too heavy, not too powerful, no too anything...
  7. nope, Barista Hustle released black anodised aluminium after the white plastic one. https://baristahustletools.com/products/the-tamper
  8. black anodised, if it is the Barista Hustle one. soo nice to use...
  9. most standard home-use E61 clone machines benefit from 2.5 to 3 mm restrictors. it is always just a plate (I've even seen teflon discs with hole in the centre - worked well enough) or another suitable piece of metal with a hole. you might end up drilling the 2.0 mm up to 3.0 mm and use that if you find that 2.5 mm is too small for your particular machine. but this is hard to tell without SCACE and measurement of the extraction temperature profile - too small jet with higher boiler pressure will inevitably end up in correct 'idle' temp and initial shot temperature, but the profile will be declining and the machine will struggle with subsequent shots (declining temperatures on them, too much dependent on the pace). oh, and always place the restrictor in the upper HX arm. its second purpose aside from restricting the thermosyphon action is to make the lower HX arm the preferred water source during the extraction (it's always mix of both). my ideal setting would be to have a machine where you don't need to flush at all. I have achieved that in old Grimac La Uno with 3.2 mm restrictor and boiler set at 1.25 Bar. extraction measured by SCACE-clone at 94 C, short flush (50 ml) just made the temperature profile more "flat" throughout.
  10. just replace the solenoid. the scale on the top of the solenoid (and any corrosion on the valve itself) is usually a quite good indication that something went terribly wrong...
  11. prices changed a lot since 2016. last time I saw quotes for standard were around € 10k without VAT in 2018.
  12. Hi all, I'm trying to declutter my "household" (after finding out I have too much stuff during moving). For sale, nice red stainless steel Airscape, small (holds 250 g of coffee just fine, pacamaras and pacas without the top lid). In good shape, some scratches on the bottom (can't be seen when standing on kitchen surface), working, I just think I can survive with coffee bags only. £10 + postage or pickup in London (Shoreditch, Bethnal Green, Edmonton, anywhere between or somewhere else around) colour is like this (my phone isn't the best camera):
  13. Sorry for late reply (seems like notifications don't work). It should fit all standard LM portafilters, Linea Mini as well.
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