May i add that if you don't get enough pressure for spraying
due to centrifugal force it may be a good idea to add a small
"pump" to it.
(my suggestion is a fan wheel from a small dc (computer) fan on the bottom
of the pipe).
i did some experimenting with a pipe and a power drill and you really need
a lot
of rpm to get something spraying. maybe a turbo wheel makes it easier.
i think the result may not be uniform, if rotated with constant angular
velocity
the middle of the board is sprayed more intense...
maybe two sprayer tubes or so..
i think for fe3cl etching it is a good idea..
but i did not further think about it when i found a cheap source for h2o2,
for me
etching in a tray and chemical regeneration of hcl /cucl is much more
convenient.
what do you want to spray?
stefan
the video is cool! must be old?
he takes the board out with bare hands... nice yellow hands if he makes
this often ;-)...
but it sows some nice features, the lid dripping back in the jar is a good
idea.
the "power chord lock" is nice too (i wouldn't implement...).
On Tue, 30 Sep 2003 09:56:08 +0200, Markus Zingg <m.zingg@...> wrote:
> I agree with Stefan that building a rotary kind of spray etcher is
> most likely a lot easier. I do have one that I boght a while ago. I
> first was happy, but over time it turned out that it does not create
> reliable reproduceable results. That's however not due to it's
> principle of operation but more because of some bad ideas on behalf of
> the manufacturer.
>
> I created a little homepage for you showing pictures of the
> (depreciated) etcher I have and most importantly a little video of the
> MUCH better Bungard spray etchers which should give you some good
> ideas on how to build your own.
>
> www.myhome.ch/mzingg/pcbstuff
>
> Markus
>
>> Anyone here every built a spray etcher ?
>> I'm looking at building a spray etcher on the cheap, but I cannot find a
>> suitable pump. Pressure requirements are fairly high for sprays nozzles
>> to work effectively. The pump must be capable of at least 10 meter head
>> (1 bar), but all low cost fountain pumps are rated no more than 4 meters
>> head. Getting hold of a pump is the killer. Example, the Iwaki MD-70RZ
>> has 16 meter head but sells for AU$500. The etchant I'm using won't
>> effect stainless steel.
>>
>>
>>
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>
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