look in the archives, i have already annoyed him with plenty of questions about this unit.
his tubes have a end plate with holes only i think.
if you can't get it working (not enough revs) i would try to glue in a small fan blade at the bottom end
(of this tiny computer fans). they are for air but also will work fine with liquid. this would propell
more etchant up the tube, also at lower speeds. (but you need a amount of speed also to get it spraying
nice.) (please remove the frame and motor part, the fan wheel is driven directly by the rotating pipe.
regards
stefan
the assembly would be more easy if you use a stainless steel rod (maybe plastic) with a few mm diameter.
this in beared on the bottom in some sleeve (plastic, ceramic).
in the top lid there is another bearing (no etchant contact here).
the rod stands out the top and has either a pulley or the motor directly attached.
at the now sturdy beared rod you simply glue the piece of pipe.
this i think is much easier to manufacture than a rod which is free at the bottom end.
if its cog is out of the center it will disintegrate when at very high revs, possibly leaving you with a
very fast out of control rotating mass in a lot of etchant.
regards
stefan
23.05.2003 05:09:32, "John Craddock" <
John.Craddock@...> wrote:
>Markus,
>Can you tell us the size of the holes at the bottom (inlet) and the sides (outlet) of the spray tubes?
Thanks
>Regards
>John C.
>
>
>-----Original Message-----
>From: Markus Zingg [mailto:m.zingg@...]
>Sent: Friday, 23 May 2003 4:25 AM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: Re: [Homebrew_PCBs] Etchant options?
>
> From the top to bottom there is a tube with fine holes in it. The tube is
>turned from a motor that is mounted on top of the box cover. The tube
>is having three bigger holes on it's lower end (it's otherwise
>closed).
>
>http://www.myhome.ch/mzingg/pcbstuff/
>
>Markus
>
>
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