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Another DB Quickmill
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SpaceTime
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Joined: 9 Dec 2013
Posts: 271
Location: Virgo Cluster
Expertise: I love coffee

Espresso: 83 & 89 Cremina, 85 Coffex
Grinder: HG One, Pharos, LIDO
Drip: Freiling 33 & 44oz FP,...
Posted Thu Jan 2, 2014, 6:26pm
Subject: Re: Another DB Quickmill
 

GRRRRRR!

;-)
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ECM
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ECM
Joined: 11 Oct 2003
Posts: 476
Location: Halifax, Nova Scotia Canada
Expertise: I like coffee

Espresso: Quick Mill Vetrano 2B
Grinder: Mazzer Robour E
Vac Pot: French Press
Drip: no
Roaster: Fresh Roast+8,  i-roast and...
Posted Sat Jan 4, 2014, 11:38am
Subject: Re: Another DB Quickmill
 

.
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,391
Location: UK
Expertise: I love coffee

Posted Mon Jan 13, 2014, 9:53am
Subject: Re: Another DB Quickmill
 

Just thought of something regarding the noise...as you know I didn't get it, don't really get it unless I introduce air into the system and create a void in the boiler. However there is one habit I have and it comes so natrually to be that I don't even think about it and probably didn't mention it.


I most/all dual boiler machines they tend not to have any low water sensor in the brew boiler, so if for any reason the water in that boiler gets low, the heating element has the potential to be exposed. Sure there is an overheat sensor, but that can only work properly if there is water in the boiler, if it is on the top of the boiler and the water level drops it won't catch the tip of the element glowing red hot before failing. If it's at the bottom, the tip can still glow red hot without heating the water, because it's not submerged.

Because of the above my habit is: I ALWAYS switch the machine on and then lift the brew lever to draw water through the group. There will always be a slight delay (on larger brew boilers) because the water will have contracted as it cools down. The net effect of this is to ensure the boiler is full and to remove any voids in the boiler. As a tester it became a habit, because you never knew quite what you were dealing with on new or prototype machines. It might also be the reason why I rarely if ever get any noise. from the 2 Vetranos I tested.

Now this is not to say there shouldn't be a few design changes, which I have sent to QM and apparently they have done....I still need to check a UK machine when they are next delivered (because I trust no one).
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Tonyv138
Senior Member


Joined: 16 Jun 2013
Posts: 72
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Mon Jan 13, 2014, 6:32pm
Subject: Re: Another DB Quickmill
 

Thanks Dave.
I was doing the same routine, but now during the night, the machine cools off enough that i have to force the brew lever a bit more up. I keep the room where the machine is @64F at night. I am thinking the lube is too cold, so I stopped. Perhaps I'll restart.

Still I get that noise a lot less nowdays.

BTW, I hope you will be able to tell us more details about the changes QM is implementing. I would like to consider those if possible.

Thanks again
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,391
Location: UK
Expertise: I love coffee

Posted Mon Jan 13, 2014, 6:36pm
Subject: Re: Another DB Quickmill
 

Tonyv138 Said:

Thanks Dave.
I was doing the same routine, but now during the night, the machine cools off enough that i have to force the brew lever a bit more up. I keep the room where the machine is @64F at night. I am thinking the lube is too cold, so I stopped. Perhaps I'll restart.

Still I get that noise a lot less nowdays.

BTW, I hope you will be able to tell us more details about the changes QM is implementing. I would like to consider those if possible.

Thanks again

Posted January 13, 2014 link

Not something you could easily do I'm afraid and I want to actually see a machine to check they have actually done it before i say what it is. Besides, I'm not going to bother doing it to mine...waaay too much hassle.

Oh and if you have descaled or backflushed without re lubing the cams it can get very stiff and wear the valve pins (cam followers)!!!!
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Tonyv138
Senior Member


Joined: 16 Jun 2013
Posts: 72
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Mon Jan 13, 2014, 6:58pm
Subject: Re: Another DB Quickmill
 

I am following your recommended water mix. Start with RO, bring TDS up with Baking Soda to 70-80PPM. Did not do any descaling aor chemical backflushes. I did not observe any change in the V2B behaviour.

I do water backflush daily. I do remove the shower screen and wash underneath weekly.

When the machine is warm, the handle moves normaly...

Thoughts?
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,391
Location: UK
Expertise: I love coffee

Posted Tue Jan 14, 2014, 5:05am
Subject: Re: Another DB Quickmill
 

Tonyv138 Said:

I am following your recommended water mix. Start with RO, bring TDS up with Baking Soda to 70-80PPM. Did not do any descaling aor chemical backflushes. I did not observe any change in the V2B behaviour.

I do water backflush daily. I do remove the shower screen and wash underneath weekly.

When the machine is warm, the handle moves normaly...

Thoughts?

Posted January 13, 2014 link

I think lubricate to be on the safe side.

http://coffeetime.wikidot.com/e61-lubrication
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Tonyv138
Senior Member


Joined: 16 Jun 2013
Posts: 72
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Tue Jan 14, 2014, 8:22am
Subject: Re: Another DB Quickmill
 

Thanks Dave. I did it. There was very little to none lube on the cam and pins. Now it is very easy to rotate, like almost no friction. I used Haynes silicone grease. Food safe and sais that it works from -40 to +400F

The most difficult part was putting the cam back into the hole.

BTW, i like the "coveralls" you have on the wrench. I wish I had some
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DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,391
Location: UK
Expertise: I love coffee

Posted Tue Jan 14, 2014, 10:05am
Subject: Re: Another DB Quickmill
 

Tonyv138 Said:

Thanks Dave. I did it. There was very little to none lube on the cam and pins. Now it is very easy to rotate, like almost no friction. I used Haynes silicone grease. Food safe and sais that it works from -40 to +400F

The most difficult part was putting the cam back into the hole.

BTW, i like the "coveralls" you have on the wrench. I wish I had some

Posted January 14, 2014 link

You can use electricians tape, or superglue some hard plastic strips (not too hard) on from something like an old synthetic floor tile etc...

One of the tricks to successfully lubricating with silicon is to make sure the surface is absolutely dry, can't remember if I put that in the article or not.
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Tonyv138
Senior Member


Joined: 16 Jun 2013
Posts: 72
Location: tx
Expertise: I love coffee

Espresso: V2B
Grinder: Mazzer SJ
Posted Tue Jan 14, 2014, 11:59am
Subject: Re: Another DB Quickmill
 

DavecUK Said:

One of the tricks to successfully lubricating with silicon is to make sure the surface is absolutely dry, can't remember if I put that in the article or not.

Posted January 14, 2014 link

it is there

when time comes, you pull those pin followers with the pliers and put new ones in?
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