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Thread: My DIY Scace

  1. #1
    Senior Member brettreaby's Avatar
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    My DIY Scace

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    for a bit of fun and because i scored a suitable pressure gauge for free , i have made up my own scace.

    The scace is built onto a backflush disk which fits into a blind portafilter: it can be removed from the portafilter when done and easily re fitted.

    The hardest part was making a bleed system; in the end i have a 1/4" bolt drilled and tapped with a 3mm bolt which can be loosened or tightened to allow the required flow.

    I adjusted it to give 30ml in 20 seconds ( flow rate 1/2 way between a single and double shot)

    I also have access to calibration so calibrated the gauge to 135psi (9 bar) so i know its accurate to about 1%.

    I've used it to calibrate my Izzo Alex and the good news is the gauge on the Izzo is exactly on 9 bar after calibration. I needed to do this becuase Chris calibrates them using tank water feed and in the plumbed in setup you have additional pressure.

    Interested in any feedback- have i missed anything?
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  2. #2
    Site Sponsor coffee_machinist's Avatar
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    Temperature! Without a temp probe of some sort this is not a 'scace' or anything resembling one, but its a bloody nice pressure test device. Love that huge calibrated gauge!

  3. #3
    Senior Member brettreaby's Avatar
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    yeah its a Wika 0-500psi reference Gauge which they had to give us when they shipped us some dodgy transducers ( long time ago mind you- good product). Straight out of Batman's Batcave. full NATA certification.

    Temp sensing i might address later but it aint that simple as bunging a probe in there.

  4. #4
    Site Sponsor coffee_machinist's Avatar
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    Incidentally and slightly OT, sorry, I've been trying to find a source for Wika gauges in melbourne / Oz generally. Any ideas?

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    Quote Originally Posted by coffee_machinist View Post
    Incidentally and slightly OT, sorry, I've been trying to find a source for Wika gauges in melbourne / Oz generally. Any ideas?
    ->>> Buy Analogue Positive Pressure Gauges Pressure,gauge,50mm,bottom entry,R1/8,1.6 bar/psi WIKA 7833926 online from RS for next day delivery.

    edit

    and here ->>>http://www.wika.com.au/contact_distr...ActiveID=22922
    Last edited by alittlewino; 8th February 2013 at 07:47 PM. Reason: added link

  6. #6
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    Quote Originally Posted by coffee_machinist View Post
    Incidentally and slightly OT, sorry, I've been trying to find a source for Wika gauges in melbourne / Oz generally. Any ideas?
    just posted a couple of links for you and they were there for a while and now have disappeared??????

    google Wika aus and you'll find the info you need or RS electronics and Blackwoods sell their gauges - no association with either/any/nada

    this thread and a little more reading got motivated to do the volumetric check on my Silvia Ver 1 and find that on volume the pressure is way too high 150ml/min or 12 bar!!

    just put in a copper washer and got 280ml - now to re-learn everything all over again - always wondered why my grind was near the bottom limit of the Rocky

  7. #7
    Senior Member brettreaby's Avatar
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    We have an oem deal with wika they do have a Melbourne office , but their sales contact is in sydney. See their website in contacts section.

    They have an amazing range of stuff it's cherman so it must be gut!

  8. #8
    Site Sponsor coffee_machinist's Avatar
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    Behmor Brazen - $249 - Free Freight
    so good even the Swiss use German gauges! Thanks all, Blackwoods seem to have what I want. 40 mm side entry plastic housing in a range of kPA. Win.



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