Need to dig out my thermodynamic book from Uni. You need to look at the relationship between pressure, flow rate and resistance.

Not thermo...go check fluids dynamics.

On pumps...vibe pumps are plunger pumps...rotary are vane pumps...the slayer uses gear pumps...go check how these work.

No to the 1st & 2nd para. Go check out the flow vs pressure graphs.

On the 3rd...think about what happens to the grounds throughout the 30 sec...

Yeah. You are right. Thermodynamic is the study of energy conversion and use in design of heat exchanger and distillation column. Been 20 years. Anyway, I'm waiting for variable SSR to experiment with pressure/flow profiling on the pump.

This post has been edited by pierreye: Mar 10 2016, 10:11 PM

Would be interesting. Got a link of the graph?


Now I'm just shooting random ideas out but couldn't you just PWM the motor to try to reduce the speed without affecting torque?

Hey no sweat...

No need to wait...just go try the light dimmer or fan controller...I've done it and after some time can't be bothered...needs too much attention...but don't let me put you off...go try...

Yes. I have been thinking about either PWM or voltage but it seems that because vibe pump is running at 50hz (pump cycle running twice in each AC wave cycle meaning moving in/out 100 times per second), I'm not sure how PWM will affect the pump. Plus most PWM module from ebay are for DC motor, not AC so I still need a SSR as a relay to turn on/off the pump. I just try out with variable SSR as it's the easier alternative.

Yeah. If every time need manual intervention it is kind of troublesome. I'm thinking if it does make a positive differences, I'll put in a timer relay module to automatically switch between different resistance like first 10 sec for low pressure pre infusion then only ramp up to high pressure.

check this out....http://www.decentespresso.com/de1

here you go...knock yourself out...

http://www.fluidotech.it/Pages/application...D_APPLICATION=4

http://www.cemegroup.com/solenoid-pumps

Woah. Never thought I would see a tablet mounted on an espresso machine. In fact I'm in a dilemma on the next upgrade if I have an itch. Either get a BES920 which had lots of control for end user but might had a reliability issue in long run which is not user repairable or get a HX machine but loose out the control part.

This post has been edited by pierreye: Mar 11 2016, 11:14 AM

Any knows where can I get hario v60 filter paper for the lowest price possible? So far I found the cheapest is RM20 at Pulp by papa palheta, while online shops have 19~22 excluding shipping fee.

Daiso one doesn't have the exact v60 shape filter paper. So if anyone knows kindly enlighten

you can get it at Parkson or I-setan, only RM9.50 for hario V60 02 filter paper

This post has been edited by wadthehellz: Mar 11 2016, 06:49 PM

Wow that's like half price! Every parkson/Isetan has it? Is it Hario brand too?

I thin all Parkson and I-setan will have. Yup Hario

yes under Greenoak Coffee Sdn Bhd

called them, price increased edi, same as dankoff. sighh

snap. how much?

1850 aftex tax

Hey, everyone !

Since everyone here are coffee enthusiast, I would like to ask would anyone here be interested in Coffee Cupping Session? I'm trying to help my friend to build his cafe business here in KL. He has a huge collection variety of imported green beans (the one I knows from Honduras, Guatemala, Kenya, Ethiopia) which he roast it in-house !

Edit:

Here are a few beans to name a few. There are more :-

Brazil Santos SC 17/18
Brazil yellow Bourbon Fazenda Dutra Jatoba
Brazil Natural Fazenda Lago Azul
Ethiopia Washed Sidamo G1
Ethiopia Amaro Gayo
Ethiopia Washed MOCCA Yirgacheffe G2/G1
Kenya AA
Kenya AB
El Salvador San Alonso
Honduras - Finca El Manzano
Columbia Excelso Huila Garzon
Columbia Supremo
Guatemala San Vincente

This post has been edited by MSA: Mar 15 2016, 05:47 PM