Re: Regulating pump pressure

| With all due respect and given the fact that I am not an electrician
| or an electrical engineer, significantly lower or higher voltage
| supplied to appliances with somewhat specific voltage and amperage
| requirements have a high failure ratio when neither of those
| requirements are met. If nothing else, it shortens their lifetimes
| darstically.

Certainly true for electronics, and possibly for a rotary pump. What Randy
is envisioning (I'm sure of this thanks to the new wiretap program:-) is
running a vibe pump off a separate circuit from the rest of the machine (so
that the electronics and heating element are unaffected), and adjusting
voltage the small amount required to get from 10+ bars down to 8 or 9 bars.
This would be a great, inexpensive tweak for unregulated home machines.
Even if the vibe pump's lifespan takes a hit, it might be worth it.

- David R.




As an ersthwile KOA manager overseeing more than 120 sites
| spread over 500 acres, I have seen some pretty freaky electrical
| occurances. In one night, we destroyed over a dozen TV's and several
| more refrigerators by delivering less than 90 volts to their trailers.
| We also knocked a couple of senior citizens on thier ass by reversing
| polarity at their hookup box. Damn it, when you grab the handle of
| your airstream to open the door, you are not expected to jump
| backwards into your neighbor's Coleman two-room tent.
| On a more serious note, I have seen some serious damage done to
| $20,000 espresso machines by sever voltage fluctuations, both high and
| low. You can blame the Backstreet boys for one of these, but I don't
| think it would be the most major of their infractions.
| Inexperienced tampering with voltage and amperage is ill-advised. If
| you do it don't call me.....al
| On Thu, 12 Jan 2006 14:20:13 -0600, jim schulman
| <jim_schulman@xxxxxxxxxxxxx> wrote:
|
| >On Thu, 12 Jan 2006 19:31:45 GMT, "Mark P." <someone@xxxxxxxxxxxxx>
| >wrote:
| >
| >>"Randy G." <frcn@xxxxxxxxxxxxxxxxxx> wrote in message
| >>news:2j9ds1p5lghhibqa7dgv3oep368tj9qjfe@xxxxxxxxxx
| >>>I was think about whether it would be possible to regulate pump
| >>> pressure during the brewing processby regulating the electricity going
| >>> to the pump? If a full-wave power control was used that supplied the
| >>> full 60 cycles to it, but regulated the voltage to lessen the water
| >>> pressure it supplied, or vice versa...? Just a thought from an art
| >>> major....
| >>
| >>Here's what Jim Schulman has to say on the subject:
| >>
| >>http://www.coffeegeek.com/forums/espresso/machines/46475
| >>
| >
| >That's the valve mod -- Greg's posted how to do ths on the Silvia
| >
| >I also connected a small variac to the pump (if you can do a PID, you
| >can do this -- any old 1 amp + variac from ebay will do the trick. It
| >does work, and one can imitate lever profiles (e.g. drop the pressure
| >smoothly during the shot just by turning down the dial). This is a
| >cheap mod, but to use it, you would need to add a pump pressure guage.
| >There's a caveat - the vibe pump will not "brown out" below about 5 to
| >6 bar; at that point it doesn't move water. And the usual caveat --
| >voids all warranties ever made anywhere, anytime; not responsible for
| >direct or incidental damage, caused or uncaused.
|

--
Less information than you ever thought possible:
http://www.demitasse.net
.

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