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Another DB Quickmill
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Discussions > Espresso > Machines > Another DB...  
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pShoe
Senior Member


Joined: 13 Nov 2012
Posts: 57
Location: Fort Lauderdale
Expertise: I love coffee

Posted Fri Nov 1, 2013, 2:24pm
Subject: Re: Another DB Quickmill
 

Dave,

You stated that, "mine doesn't do it and I can't seem to make it do it, unless I empty the tank and feed tube to the tube has air in, then fill the tank, then I get the noise."

Since you are able to replicate the sound by introducing air, I'm pretty sure we can say with confidence that the sound is caused by air. You also said this can happen in other machines. What fixes were made for other machines to stop the sound?

Why would US motors spin faster?
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DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,322
Location: UK
Expertise: I love coffee

Posted Fri Nov 1, 2013, 3:06pm
Subject: Re: Another DB Quickmill
 

pShoe Said:

Dave,

You stated that, "mine doesn't do it and I can't seem to make it do it, unless I empty the tank and feed tube to the tube has air in, then fill the tank, then I get the noise."

Since you are able to replicate the sound by introducing air, I'm pretty sure we can say with confidence that the sound is caused by air. You also said this can happen in other machines. What fixes were made for other machines to stop the sound?

Why would US motors spin faster?

Posted November 1, 2013 link

The 60Hz vs 50Hz, but it's just a guess that if the motor manufacturers were lazy or keeping costs down a similar design might use mains freq to regulate speed, perhaps it will turn faster...i'm grabbing at straws here.

With other machines that had the sound, it was manual cleaning of the antibackflow valve as running descaler through it usually didn't help for very long....but lets see what the tests  show and whether someone with it plumbed in gets the sound (which I doubt).

Someone mentioned the Vivaldis, with the S1 or is it S2, the orientation of the pump and the back pressure in the system, would mean it wouldn't even prime from a bottle on the counter if it was hot.  So you have to be careful with any anti backflow valve design. If the closure spring is too strong (but there has to be one), then you get less sealing problems, but a danger of  difficult priming on a hot system if the pump ever is empty. The vetrano runs tanked or plumbed, so does present some challenges (as do all these machines) in maintaining a good seal to the brew system on tanked operation, the positive pressure of the mains is a great help here. I remember years ago when tanked rotary prosumer machines didn't exist, concerns over pump priming and flow were the main reasons why. It's also why I keep saying, water quality causes most espresso machine problems and use treated RO water. So far my Duetto ran fault free for over 6 years and I'm hoping my Vetrano 2B will as well.
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DeanOK
Senior Member
DeanOK
Joined: 24 Sep 2012
Posts: 619
Location: OK
Expertise: I like coffee

Espresso: QM Vetrano 2B
Grinder: Vario W
Posted Fri Nov 1, 2013, 3:18pm
Subject: Re: Another DB Quickmill
 

pShoe Said:

Dave,


Why would US motors spin faster?

Posted November 1, 2013 link

Assuming the same motor is being used ...the line frequency in England is 50Hz... so in the US the same motor would be 20% faster on our 60hz power grid if they both were designed for the same voltage. Most 50 hz designed motors can be used on 60hz without modification, but not always the same when using a 60hz motor on 50hz. Since the voltage in America is lower, I would assume that they are two totally different motors, but I don't know that because they could be using a motor that is dual voltage. With that said, rpm is determined by number of polls divided into the line frequency with a factor for magnetic slippage (the simplified answer), so most US AC induction motors would be 20% faster than 50 hz motors in other countries, regardless of voltage, as long as they have the same number of polls. Hope that makes sense.
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germantownrob
Senior Member
germantownrob
Joined: 2 Dec 2007
Posts: 2,128
Location: Philadelphia
Expertise: I love coffee

Espresso: Duetto 3, A Dead Oscar
Grinder: Vario-W, Preciso w/Esatto,...
Drip: Brazen
Roaster: Diedrich IR-1, HT B
Posted Fri Nov 1, 2013, 4:23pm
Subject: Re: Another DB Quickmill
 

I mentioned a while back that I will get this noise on my Duetto once in a while. When it first happened it was alarming but troubleshooting the problem has now solved it completely. Not only would I get the noise from the pump but the pump moved a lot when dealing with the air going through it and rattled against all sorts of things to make a bigger racket. Once I pulled the tube up and let air in it intentionally I was able to confirm that that was the noise plus I could see what the pump was hitting and made some padding with high heat tape. Next I had to figure out why I was getting air in the first place. First I noticed it was happening when my tank would run lower then 1/4 full but not always. Next I noticed that there was an amble amount of silicon tubing going into the tank and with the machined pulled out I could see when I replaced the top to the tank the hose would end up at times curling back up. My solution was to take the slack out of the tubing going into the tank so gravity pulled it to the bottom.

This may not be exactly what is happening to all of you but once someone finds the reason it will be simple enough to fix. Good luck.

Oh yeah, didn't I mention something about annoying monster threads in the past here, now to scroll for 2min so I can post this from my iPad, lol.
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DeanOK
Senior Member
DeanOK
Joined: 24 Sep 2012
Posts: 619
Location: OK
Expertise: I like coffee

Espresso: QM Vetrano 2B
Grinder: Vario W
Posted Fri Nov 1, 2013, 4:29pm
Subject: Re: Another DB Quickmill
 

germantownrob Said:

Oh yeah, didn't I mention something about annoying monster threads in the past here, now to scroll for 2min so I can post this from my iPad, lol.

Posted November 1, 2013 link

Been there.... we do need to start breaking the V2B topics up into separate threads.
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CarloM
Senior Member


Joined: 1 Apr 2013
Posts: 306
Location: Los Angeles
Expertise: I live coffee

Espresso: Vetrano V2B
Grinder: Mazzer Mini-E Type A, SJ...
Drip: Toddy
Posted Sat Nov 2, 2013, 2:08pm
Subject: Re: Another DB Quickmill
 

Dave - tried the switch from tank to mains three times and it still did it. I switched back and forth with the power off (machine plugged in but power not on). Do you need to do it with the power on?

Also, regarding OPV - when I draw about 2oz (which I think is about 60ml) the pressure gauge rests back between 4-5, and then slowly creeps back up to ~9 after a few minutes. Is this correct or do I need to adjust?

Many thanks!
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pShoe
Senior Member


Joined: 13 Nov 2012
Posts: 57
Location: Fort Lauderdale
Expertise: I love coffee

Posted Sat Nov 2, 2013, 5:55pm
Subject: Re: Another DB Quickmill
 

CarloM Said:

Dave - tried the switch from tank to mains three times and it still did it. I switched back and forth with the power off (machine plugged in but power not on). Do you need to do it with the power on?

Also, regarding OPV - when I draw about 2oz (which I think is about 60ml) the pressure gauge rests back between 4-5, and then slowly creeps back up to ~9 after a few minutes. Is this correct or do I need to adjust?

Many thanks!

Posted November 2, 2013 link

Carlo, I cross posted this to the new thread created for the noise.
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emil3m
Senior Member


Joined: 14 Jan 2013
Posts: 103
Location: New York
Expertise: Just starting

Espresso: Crossland CC1
Grinder: Vario
Posted Sun Nov 3, 2013, 9:23pm
Subject: Re: Another DB Quickmill
 

I've watched some of the videos (thanks to the poster that summarized them), but I don't know which ones operate on a tank.

Would those of you who are on a tank be able to record pulling a double shot please? I'd love to get a preview of what preinfusion and pulling look and sound like.

Thank you and thanks for this thread--love reading it!


Est purchase date: Jan 2014

 
Currently in love with Hayes Valley by Blue Bottle--locally roasted next to my house in Brooklyn
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stuart1967
Senior Member


Joined: 17 Nov 2013
Posts: 4
Location: THE WOODLANDS
Expertise: Just starting

Posted Tue Nov 26, 2013, 2:39pm
Subject: Re: Another DB Quickmill
 

Seems like the Brits need some bling after all!!!

Click Here (www.bellabarista.co.uk)
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sharky
Senior Member
sharky
Joined: 9 Jan 2013
Posts: 176
Location: Calgary, AB
Expertise: I love coffee

Espresso: QM Vetrano 2B
Grinder: Compak K3 Touch
Posted Wed Nov 27, 2013, 6:18am
Subject: Re: Another DB Quickmill
 

stuart1967 Said:

Seems like the Brits need some bling after all!!!

Click Here (www.bellabarista.co.uk)

Posted November 26, 2013 link



Awesome!  It looks like the Brits have embraced the 'disco' look too!  LOL!
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