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pressure profiling with vibe pump
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tracerbullet
Senior Member
tracerbullet
Joined: 13 Feb 2012
Posts: 168
Location: Saint Paul
Expertise: I love coffee

Posted Fri Jun 15, 2012, 10:54am
Subject: Re: pressure profiling with vibe pump
 

I finally got my dimmer installed last night. Used a long thin type intended for the halogen torchiere lamps. I drilled a hole through the side of the lower unit of my machine, mounted this thing inside with only the knob sticking out, and that knob is right next to my pressure gage. It is of course a knob sticking out the side of the machine but it looks about as integrated as I can expect. I soldered and shrink wrapped my connections and used spade terminals. I should have taken a picture or two of it going in.

I gave it a single run this morning and it was interesting, I'll definitely have to play with it. With the dimmer all the way up I peg my gage at about 135 - 140psi where the OPV is set, so I'm getting full power or at least enough that direction. At the other end the pump just humms and the water barely flows, and I seem to have good adjustability anywhere in between.

I pulled a shot over maybe 45 seconds at a pressure that I think hovered around 4 bar but I was doing a few things at once and didn't get to really monitor it. Got my normal 2 oz before it blonded and it also tasted about like it usually does. I've been trying out an Aeropress recently so my comparison basis is a little off.

Hopefully this weekend I can try a few shots back to back, normal vs. slow flowed and see how they compare. I'm interested in varying the pressure at the beginning and end - is it good to start high and go low, vice-versa, who knows? Looking forward to it.
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Craigman
Senior Member


Joined: 13 Oct 2012
Posts: 11
Location: Sunshine coast Australia
Expertise: I love coffee

Posted Tue Oct 16, 2012, 12:21pm
Subject: Re: pressure profiling with vibe pump
 

I think start high then slow it down according to the flow.
should be fun to play with and see what it tastes like.

I am going to do mine soon.
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Bgosselin
Senior Member


Joined: 26 Jul 2012
Posts: 51
Location: Canada,quebec
Expertise: I love coffee

Posted Wed Oct 17, 2012, 7:35pm
Subject: Re: pressure profiling with vibe pump
 

Anyone try a lamp dimmer like this?

http://www.1800doorbell.com/db800-gbase-ar180.htm

Better looking and may be fix under the machine for a cleaner look.

Love this thread.  I've been thinking about this when I saw the slayer clip on youtube.  The 3 parts with Seattlecoffeegeer.  I never imagine a mod could be so easy.

Bruno
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Craigman
Senior Member


Joined: 13 Oct 2012
Posts: 11
Location: Sunshine coast Australia
Expertise: I love coffee

Posted Sun Oct 21, 2012, 11:24pm
Subject: Re: pressure profiling with vibe pump
 

I used a rotary one and just drilled a hole to mount it.

It is the little white knob at the top right of the machine.

You can also see where I mounted a 16bar gauge

Drilling through the SS was a bitch though!

Craigman: pump speed controler (Large) (Medium).jpg
(Click for larger image)
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Bgosselin
Senior Member


Joined: 26 Jul 2012
Posts: 51
Location: Canada,quebec
Expertise: I love coffee

Posted Mon Oct 22, 2012, 9:34am
Subject: Re: pressure profiling with vibe pump
 

I have a brand new R58 and don't want to put hole in it.  Not even sure if my pump model work with a dimmer.  I read a few thread on the subject and saw mention of diode that could make the mod make the motor behave heratically.  My R58 has a rotary pump.

Bruno
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Craigman
Senior Member


Joined: 13 Oct 2012
Posts: 11
Location: Sunshine coast Australia
Expertise: I love coffee

Posted Tue Oct 23, 2012, 2:30am
Subject: Re: pressure profiling with vibe pump
 

You can't just put it on the cord otherwise it will affect the heating

You will need to get inside to the pump

maybe you can come out the bottom depending on your machine
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Bgosselin
Senior Member


Joined: 26 Jul 2012
Posts: 51
Location: Canada,quebec
Expertise: I love coffee

Posted Tue Oct 23, 2012, 9:10am
Subject: Re: pressure profiling with vibe pump
 

I know.  I think I could ge the extension out whre the electric cord gets out.
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Craigman
Senior Member


Joined: 13 Oct 2012
Posts: 11
Location: Sunshine coast Australia
Expertise: I love coffee

Posted Tue Oct 23, 2012, 12:19pm
Subject: Re: pressure profiling with vibe pump
 

sound good, anything is better than drilling through Stainless Steel
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Frost
Senior Member
Frost
Joined: 26 Jul 2007
Posts: 2,099
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Tue Oct 23, 2012, 1:52pm
Subject: Re: pressure profiling with vibe pump
 

Bgosselin Said:

..................  My R58 has a rotary pump.

Bruno

Posted October 22, 2012 link

This pressure control method is not suitable for a rotary pump. Full Stop!
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Craigman
Senior Member


Joined: 13 Oct 2012
Posts: 11
Location: Sunshine coast Australia
Expertise: I love coffee

Posted Thu Oct 25, 2012, 1:33pm
Subject: Re: pressure profiling with vibe pump
 

What about looking at the plumbing side of things and using a adjustable needle valve or something simular?
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