An I guess a lot of that mist can be mitigated by having something
floating on the surface of the etchant so as the tiny bubbles collect
and form larger bubbles prior to breaking the surface. Most of the mist
is generated by the surface tention of the liquid breaking at the
bubble pops causing tiny droplets of liquid. Therefore if the bubbles
are collect into larger bubbles before breaking the surface then there
is less 'surface-tention breaking events' thus less mist.
Cheers,
David
Robert Hedan wrote:
>>-----Message d'origine-----
>>De : Homebrew_PCBs@yahoogroups.com
>>[mailto:Homebrew_PCBs@yahoogroups.com] De la part de lcdpublishing
>>Envoyé : juillet 12 2006 17:49
>>À : Homebrew_PCBs@yahoogroups.com
>>Objet : [Homebrew_PCBs] Super bubbler - got it working now!
>>
>>
>>
>>
>... So, like all "real men" do, I opted for more power! MUCH MORE POWER!
>...
>
>
>>Chris
>>
>>
>
>
>You've come to the same conclusion I did several months ago, the fishtank
>pump just doesn't cut it. I connected my shop air compressor to a drilled
>PVC tube I had running down the bottom of the etching tank. I kept on
>adding rows of holes until I got the desired 'coverage'. I used a ball
>valve with a nice red handle to control the air flow.
>
>Like you, I knew that one accidental tap on that handle and I'd have a
>disaster on my hands. Don't forget, that bubbling action at the surface
>creates a very fine ferric chloride mist. Just 'cause you don't see it
>doesn't mean it's not there, and I didn't have adequate ventilation for a
>permanent installation.
>
>I sure did get awesome bubbling action going though, like boiling water, but
>not as crazy. One day when I'm going to have a decent shop space, I will
>make another etching tank. But for the time being, all my equipment fits in
>a large plastic bin, way up high on the top shelf (with the acid stored on
>the bottom shelf of a cabinet out of harms way).
>
>Now add a section of metal pipe after the air compressor, place a heat
>source alongside that pipe and you've added temperature control to the
>etching.
>
>Robert
>:)
>
>
>
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBs
>
>If Files or Photos are running short of space, post them here:
>http://groups.yahoo.com/group/Homebrew_PCBs_Archives/
>Yahoo! Groups Links
>
>
>
>
>
>
>
>
> ∗∗ ACCEPT: CRM114 PASS Markovian Matcher ∗∗
>CLASSIFY succeeds; success probability: 1.0000 pR: 50.7660
>Best match to file #0 (nonspam.css) prob: 1.0000 pR: 50.7660
>Total features in input file: 6014
>#0 (nonspam.css): features: 1603168, hits: 166139, prob: 1.00e+00, pR: 50.77
>#1 (spam.css): features: 786960, hits: 116216, prob: 1.71e-51, pR: -50.77
>
>-=xtra Stuff-=-
>
> From sentto-4505361-15161-1152747819-yahooÜureton.com@... Thu Jul 13 09:43:48 2006
>Return-path: <sentto-4505361-15161-1152747819-yahooÜureton.com@...>
>Envelope-to: yahoo@...
>Delivery-date: Thu, 13 Jul 2006 09:43:48 +1000
>Received: from n26.bullet.scd.yahoo.com ([66.94.237.55])
>by whitetail with smtp (Exim 4.62)
>(envelope-from <sentto-4505361-15161-1152747819-yahooÜureton.com@...>)
>id 1G0oMt-0002KF-Qg
>for yahoo@...; Thu, 13 Jul 2006 09:43:48 +1000
>Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
>DomainKey-Signature: a=a-sha1; q=dns; c=nofws; s=lima; d=yahoogroups.com;
>b=/WAysTBjW3lS2iJiT7DV+FKmqlYRyz63Ky/eoMQhLEvXlLWmZRBA320xZ7/ODTa//bJQTvgfUg7F36ZxgVKQikw3cHIgFe/JKHXD9WVOx6THR5diWPv+uD289c8Kse;
>Received: from [66.218.69.5] by n26.bullet.scd.yahoo.com with NNFMP; 12 Jul 2006 23:43:40 -0000
>Received: from [66.218.66.32] by t5.bullet.scd.yahoo.com with NNFMP; 12 Jul 2006 23:43:40 -0000
>X-Yahoo-Newman-Property: groups-email
>X-Yahoo-Newman-Id: 4505361-m15161
>X-Sender: robert.hedan@...
>X-Apparently-To: Homebrew_PCBs@yahoogroups.com
>Received: (qmail 9310 invoked from network); 12 Jul 2006 23:14:29 -0000
>Received: from unknown (66.218.66.217)
> by m26.grp.scd.yahoo.com with QMQP; 12 Jul 2006 23:14:29 -0000
>Received: from unknown (HELO relais.videotron.ca) (24.201.245.36)
> by mta2.grp.scd.yahoo.com with SMTP; 12 Jul 2006 23:14:25 -0000
>Received: from p41900 ([70.83.221.118]) by VL-MO-MR002.ip.videotron.ca
> (Sun Java System Messaging Server 6.2-2.05 (built Apr 28 2005))
> with ESMTP id <0J2B00HQ6BZRKWI0@...> for
> Homebrew_PCBs@yahoogroups.com; Wed, 12 Jul 2006 19:02:19 -0400 (EDT)
>In-reply-to: <e93qne+g4qa@...>
>To: Homebrew_PCBs@yahoogroups.com
>Message-id: <000e01c6a607$37d7cfb0$0200a8c0@p41900>
>X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2869
>X-Mailer: Microsoft Outlook, Build 10.0.6626
>Importance: Normal
>X-Priority: 3 (Normal)
>X-MSMail-priority: Normal
>X-Originating-IP: 24.201.245.36
>X-eGroups-Msg-Info: 1:0:0:0
> From: Robert Hedan <robert.hedan@...>
>X-Yahoo-Profile: roberthedan
>Sender: Homebrew_PCBs@yahoogroups.com
>MIME-Version: 1.0
>Mailing-List: list Homebrew_PCBs@yahoogroups.com; contact Homebrew_PCBs-owner@yahoogroups.com
>Delivered-To: mailing list Homebrew_PCBs@yahoogroups.com
>List-Id: <Homebrew_PCBs.yahoogroups.com>
>Precedence: bulk
>List-Unsubscribe: <mailto:Homebrew_PCBs-unsubscribe@yahoogroups.com>
>Date: Wed, 12 Jul 2006 19:02:15 -0400
>Subject: RE : [Homebrew_PCBs] Super bubbler - got it working now!
>Reply-To: Homebrew_PCBs@yahoogroups.com
>Content-Type: text/plain; charset=ndows-1252
>Content-Transfer-Encoding: quoted-printable
>
>
>
>>-----Message d'origine-----
>>De : Homebrew_PCBs@yahoogroups.com
>>[mailto:Homebrew_PCBs@yahoogroups.com] De la part de lcdpublishing
>>Envoyé : juillet 12 2006 17:49
>>À : Homebrew_PCBs@yahoogroups.com
>>Objet : [Homebrew_PCBs] Super bubbler - got it working now!
>>
>>
>>
>>
>... So, like all "real men" do, I opted for more power! MUCH MORE POWER!
>...
>
>
>>Chris
>>
>>
>
>
>You've come to the same conclusion I did several months ago, the fishtank
>pump just doesn't cut it. I connected my shop air compressor to a drilled
>PVC tube I had running down the bottom of the etching tank. I kept on
>adding rows of holes until I got the desired 'coverage'. I used a ball
>valve with a nice red handle to control the air flow.
>
>Like you, I knew that one accidental tap on that handle and I'd have a
>disaster on my hands. Don't forget, that bubbling action at the surface
>creates a very fine ferric chloride mist. Just 'cause you don't see it
>doesn't mean it's not there, and I didn't have adequate ventilation for a
>permanent installation.
>
>I sure did get awesome bubbling action going though, like boiling water, but
>not as crazy. One day when I'm going to have a decent shop space, I will
>make another etching tank. But for the time being, all my equipment fits in
>a large plastic bin, way up high on the top shelf (with the acid stored on
>the bottom
>
>
> -0-0-0-
>
>