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PID thoughts - Page 3

Postby erics on Tue Aug 31, 2010 11:56 am

здравствуйте Rostislav -

Some friendly thoughts for your NEXT adventure -

Obtain a few M6 x 18 grouphead screws (p/n 00300021) and drill them in a lathe like a friend did for his Rancilio Silvia:

Image

Now use the screw as a "jig" for drilling the grouphead:

Image

The hole in the grouphead can now be enlarged and tapped for an adaptor to fit a thermocouple. Possibly the easiest path would be to drill it out to 5.0 mm and continue the M6 threads all the way out the top. You could adjust the thermocouple depth as to your liking. My friend chose this:

Image

On a separate subject, Ian (CafeIke) is very correct about that high boiler pressure. While it is true that 1.40 bar provides enough power for a small steam turbine :) , it also makes for large flushing times. The Musica is APPARENTLY designed for, say, a cursory 2-second screen flush and go. But, then again, if 1.40 bar gives you what you want . . . it sounds good to me.
Skål,

Eric S.
http://users.rcn.com/erics/
E-mail: erics at erols dot com
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Postby Rostik_KIEV on Wed Sep 01, 2010 2:31 am

At first I wanted to make how you have offered. Has then started to doubt that water temperature (!) indications will be true. Coffee cake is cold. Besides, between a cake and the dispersive screen is a free space that would introduce the corrective amendments in indications of water temperature which arrives in group.
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Postby cafeIKE on Wed Sep 01, 2010 1:09 pm

The Rostislav Musica probe location mimics that of Eric's adapter for an e61. It's well above and much farther from the coffee cake. Both the thermofilter and the adapter show dropping temperatures as the shot progresses, meeting about 10s after flow starts. If possible, turn the boiler down to 0.5bar [steam power will be poor], let the machine idle for 15 to 30 minutes and see if it changes the shot profile. A warming flush, rather than cooling, will probably be needed.

Eric's adapter sense location
Image

Scace v Adapter profile
Image

See Monitoring Brew Temperature - E61 & Silvia
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Postby CoffeeOwl on Wed Sep 01, 2010 5:34 pm

So... regarding the thread topic, has anybody pided their thoughts yet?
:mrgreen:
'a a ha sha sa ma!


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Postby mitch236 on Fri Sep 03, 2010 10:48 am

CoffeeOwl wrote:So... regarding the thread topic, has anybody pided their thoughts yet?
:mrgreen:


Imagine how wonderful the world would be if we could. Nobody would over-react, we would all be ready for anything and we would keep a steady mind!!!
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Postby cafeIKE on Fri Sep 03, 2010 11:42 am

P R O Z A C
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Postby Rostik_KIEV on Fri Sep 03, 2010 3:45 pm

cafeIKE wrote:If possible, turn the boiler down to 0.5bar [steam power will be poor], let the machine idle for 15 to 30 minutes and see if it changes the shot profile. A warming flush, rather than cooling, will probably be needed.


I can't lower pressure more low, than 0,9 bar, the adjustment screw don't turn more. The shot profile doesn't change.
Image

I have specially prolonged a shot to 47 seconds.
All it is strange.
It seems to me that the reason in bad mixing of water which arrives in group from a hot and cold source. What else there can be explanations?
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Postby cafeIKE on Fri Sep 03, 2010 5:26 pm

Examining pg 4 of the Musica Parts Book, there appear to be two gicleurs in the back of the group 07300684 GIGLEUR M8X8 F.3,2 and 07300225 GIGLEUR M8X8 F.3 AG.28.05.93.

My guess is the hydraulic circuit is either not exactly as drawn and hot water is forced from the center of the HX into both group inlet & outlet and / or there is far more restriction in the group return than inlet. If the hydraulic circuit is as drawn and even flow into both inlet & outlet, the group temperature should drop like a rock.
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Postby Rostik_KIEV on Sat Sep 04, 2010 2:04 am

Thanks, I should be more attentive when looked the scheme.
These GIGLEURs different - 3,0 and 3,2. It is improbable, but can be them have mixed during assemblage?
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Postby Rostik_KIEV on Sat Sep 04, 2010 3:56 pm

cafeIKE wrote:Examining pg 4 of the Musica Parts Book 07300225 GIGLEUR M8X8 F.3 AG.28.05.93.



I have looked on 07300225. Has untwisted a nut and has seen:
Image

It is a GIGLEUR? Internal diameter of 6,0 mm.
I thought that M8X8 is a carving connection.

In group more anything isn't present, I have attentively considered by means of a mirror and a small lamp.
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