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Thread: Silvia Puck

  1. #1
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    Silvia Puck

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Been playing around with the Tamping and puck along with the Rocky grinder - after reviewing a couple of threads on the subject it seems you almost need to just touch the mesh filter when preparing the dose.

    But on the silvia there is a nut in the middle with digs right into the puck - so if I was to level my coffee as required I find it difficult sometimes to fit. At the moment I am just a couple of millimeters from the surface almost on the first ridge - bit of tamping to help things in. Run the dose and check the puck, well when its not too tight to get the thing loaded that is - anyway still finding the nut bedded into the puck - tried reducing the amount of coffee - found the puck really wet and hey the nut impression still there.

    After seeing a few pics in comparison there is no sign of this ?? So is this just on the silvia ?

    And yep its christmas and I want a good coffee..............

  2. #2
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    Re: Silvia Puck

    Hi, Scollops -

    I think you will always get the impression of the hex head screw in a correctly dosed Silvia puck. Although I now use a LM ridgeless double basket, I recall that the "correct" fill of coffee in the Rancilio double basket, at least for me, was when the loose coffee was level with the top of the rim of the basket before tamping.

    After tamping, the coffee would be at or just a little above the ridge in the basket.

    This dosing always resulted in an impression of the hex head of the screw, but usually no impression, or only a faint impression, of the smooth edge of the screen around the perimeter of the puck.

    Jim

  3. #3
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    Re: Silvia Puck

    Yeah the double basket..........had a moment when the tamper was suck in the basket - nice new one guess the baskets need changing sometime. Hmm hey jim do you do the baskets ? was wondering when I pop the order in for the PID kit could get an upgrade in small things too.

  4. #4
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    Re: Silvia Puck

    Yes, a well-dosed/tamped basket always leaves a good impression.

    However, straining to get the portafilter to lock should not be necessary, and is indicative of over-dosing.

    Try grinding less into the basket, while still ensuring a 60 ml (double basket) pour in 30 or so seconds.

    -Robusto

  5. #5
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    Re: Silvia Puck

    I find that whenever I hit a good shot of espresso there is always a faint inpression of the hex nut on the surface of the puck. The silvia works great if your dosage is spot on, however if you overdose, the portafilter doesnt want to lock into position, and if forced, the seal between the portafilter and group head is comprimised, reulting in leakage over the top of the portafilter. If you underdose (no impression of the nut left in the puck) the shot is underextracted and the puck (if you can call it that) is slush.

    So, I use the ridge of the double filter as my indicator. Anything below this point, results in an easy fitting portafilter, no nut indentation, a soggy puck and average espresso. If I overdose, the results tend to be equally as bad, but at least the puck is solid.

    I read somewhere that the reason the hex nut head leaves an indentation in the puck (if your dosage is spot on), is due to the hot water causing the coffee to expand. So, if i can get a nice firm puck after extraction with a faint indentation of the nut on the surface, then I know my dosage was ok.

    Coffee break time....

  6. #6
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    Re: Silvia Puck

    The puck expands somewhat, but even more dramatic is a huge increase in mass.

    The weight more than doubles, if my recollection is right. All that extra body--water, of course-- has to be accommodated in an area roughly the same volume as before the extraction. So you can imagine the pressure dynamics at play within the basket.

    --Robusto

  7. #7
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    Re: Silvia Puck

    Quote Originally Posted by scollops link=1167053065/0#2 date=1167091169
    Hmm hey jim do you do the baskets ? was wondering when I pop the order in for the PID kit could get an upgrade in small things too.
    Normally, were just PID geeks.

    And Id be suprised if the ridgeless LM doubles are not available from one of the other CS site sponsors. Suggest you check with them first. If that doesnt work out for you, I know there is a US source and I can probably get them for you.

    Jim

  8. #8
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    Re: Silvia Puck

    Get an old credit card or similar plasic card and start to round off of the base with some scissors.
    Then overdose and compact the basket. Cut the excess with the flat top edge of the card, and then cut the basket with the rounded base of the card. This should then remove some grinds from inside the basket (making a shallow indent). Compact then tamp.

    Try pulling a shot - if its still overdosed, round off the base of the card a bit more and try again.. once you get it at the right curve, all you need to do is fill, compress, cut with the rounded end and tamp resulting in a consistent, perfect puck.

    -g

  9. #9
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    Re: Silvia Puck

    Behmor Brazen - $249 - Free Freight
    Dont know whether its necessary to go to that length -- though whatever helps is always a good suggestion.

    With the stock-standard Rancilio double basket, I grind directly into it from the Iberital grinder. This machine has a timer, which Ive adjusted to measure out approx 9 grams.

    So, grind 9 grams worth, and tap the portafilter on the bench lightly to settle.

    Back to the grinder, for another 9 grams (approx). Repeat the tap.

    By this stage, the basket is heavily overleaded, heaped way, way over the brim.

    I certainly do not, as many others have suggested, now run a sraight edge across the top to remove excess coffee. My plan is to have about 17 - 19 grams in there. The group will take that without force.

    I just spread the coffee mound evenly to the sides, and then tamp with 14 kilos of force.

    --Robusto




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