[Homeroast] Turning Bottomless Portafilter

Rich rich-mail at octoxol.com
Sun Aug 29 10:08:45 CDT 2010


Lets see here.  The machine could be modified to extract with steam at 
150psi instead of water at 200F->210F and that should yeald coffee 
liquid in the cup at very close to boiling.

Joseph Robertson wrote:
> miKe,
> This question is to you. I know you like pf's as much as I do but I have
> never heard you chime in when we get into pf pro and con's of  these
> discussions regarding the temp differential between bottom on and bottom off
> as Dennis just brought up.
> Can we talk you out of another 2 cents on this. I know you have probably
> covered it before but for the sake of us old dogs with old memory cells?
> JoeR
> 
> On Sun, Aug 29, 2010 at 6:03 AM, Dennis Parham <dparham_is at mac.com> wrote:
> 
>> Justin, he charged me 35$ for 2 of them and I threw in a 5 spot for tip
>> since he dropped everything to do it... he obviously let me watch and it was
>> a great learning experience... just look up a machinist locally.. its a
>> small job and many haven't seen a portafilter so its kind of a novelty to
>> them I bet... he did a great job.. he even tool little aluminum shims on the
>> side to make sure not to scratch or mar the outside... Im totally happy with
>> it! however... even though I have had bottomless portafilters before I
>> didn't do allot of testing on temps but one thing I now notice... when
>> portafilter is setting inside group and heated to temp it sits about 10˚
>> cooler than with bottom on... when water hits basket ( empty ) water temps
>> shoot up and stabilize at 201˚ through the shot then falls off quickly back
>> down to 189 ish ... Ive always loved the flavors I get from the bottomless ,
>> maybe I pay more attention, but the temp variable is in question of why this
>> makes it better... hmm... for me, that is, and many who like this style....
>> maybe it keeps group from overheating when setting still?? hmm... more tests
>> coming...
>>
>> Dennis Parham
>>
>>
>>
>>
>> On Aug 29, 2010, at 12:33 AM, Justin Schwarz wrote:
>>
>>> This is kind of becoming a dead horse but i'll throw in my 2¢, I have
>> done a few of these using nothing more than vice grips on a bench, a
>> cordless drill and a dremel.  I attached to the first part of the handle
>> that is metal arranged in such a way that if the drill were to sieze in the
>> process it would not fly away.  I used a 2" hole saw and a cordless drill
>> with plenty of cutting oil, brass is pretty soft stuff so as long as you are
>> using low speed it didnt seem all that dangerous to me. If you are not
>> familiar with drilling metal be careful (especially when the hole is almost
>> complete), but no need to be afraid of the relatively simple process. A
>> cordless drill with a clutch chuck works great. Once the hole was cut
>> finishing touches were performed with a dremel, no sharp edges.
>>> The only time I have injured myself drilling through metal was with an
>> electric (plug in type) drill they are far less forgiving than a cordless.
>> 1/2 inch hole through 3/8" steel overhead on top of a 12' ladder, the bit
>> siezed as I punched through the last bit of the hole and twisted my hand
>> pretty bad, broke the bit, droped the drill and almost fell off the ladder.
>>> With all of that being said, the one Dennis had professionally turned in
>> a machine shop looks beautiful and I am jealous about that perfect bevel on
>> the underside, how much did it cost?
>>>
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> 
> 
> 



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