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Topic: hacking a silvia portafilter (7 msgs / 153 lines)
1) From: Mike Koenig
So, I was planning to hack off the bottom of the portafilter from my old
Silvia, but I noticed that the section that the handle screws into
encroaches on the area that I would be cutting out.
Has anyone here ever tried cutting the bottom out of one of these? (It's
from about a 6 year old Silvia, not the current generation).
I hate to hack up my nice heavy portafilters that came with my current
machine, so I'm hoping I can use this one.
--mike
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2) From: michael brown
do you think you could snap a picture?  i'm not sure i'm wrapping my head around what your describing but think i'm in a similar boat with the Estro machine i have.
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3) From: Andy Thomas
I have a *$$ Barista, same as Estro I think, and same issue. That is, I loo=
ked =
at it the other day with the idea of cutting off the bottom, but it didn't =
look =
possible without destroying the thread that the handle screws into.
From: michael brown 
To: homeroast
Sent: Sun, September 12, 2010 4:06:58 PM
Subject: Re: [Homeroast] hacking a silvia portafilter
do you think you could snap a picture?  i'm not sure i'm wrapping my head=
 around =
what your describing but think i'm in a similar boat with the Estro machine=
 i =
have.
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riascoffee.com
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4) From: raymanowen
The following has a lot to say about the hardening of brass: <http://www.artmetal.com/blog/tantoinette/2008/11/heat_harden_brass>Not to bore anyone with car stuff, but manual transmissions used to employ
brass rings to assist in synchronizing the sliding spur gears when shifting.
An easy project for an advanced high school metal shop or commercial metal
fabricator would be to investment cast a popular-size brass porta filter
handle with a deeper, slightly repositioned “boss” for the handle screw
threads and no bottom.
On the other hand, the hack job of great dexterity and little foresight will
create lines of increased stress and strain near the threaded base of the
handle itself. The stress risers will cause the brass to “work harden” =
with
every lock/ unlock operation.
If the barista is a little heavy handed, the hardening will progress to the
point where the piece is brittle and will act more like an egg shell than
Marine grade brass.
(If the specific heat of brass is supposed to stabilize the temperature of
water, it's already a bust.) The specific heat of water is higher than brass
and there is virtually no contact or heat exchange, even with a normal p/f.
None at all in the tricked-out bottomless ones.
Cheers, Mabuhay, Lloniannau i diod da o goffi! -RayO, aka Opa!
Got Grinder?
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5) From: Allon Stern
On Sep 13, 2010, at 3:50 AM, raymanowen wrote:
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I think that the problem being solved by keeping the PF hot is not that it will suck heat out of the water while extracting but that it will suck heat out of the group head.
It will no matter what, but it will be less of a factor if the PF is up to temp.
One could always go with the freezaporto.http://www.youtube.com/watch?v=0vEfbO1hLlA-
allon
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6) From: Dennis Parham
HAHAHAHAHA  NNIICCEE!! lol Much easier@ finally! a technique that makes sense! LMAO
Dennis Parham
On Sep 13, 2010, at 10:01 AM, Allon Stern wrote:
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7) From: John A C Despres
AHAHAHAHAHA!!!!!! What a hoot!
John
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