23.04.2003 17:27:08, Markus Zingg <
m.zingg@...> wrote:
hi
the three holes, are they straight through or are they at an angle drilled?
(and please stay with the mm, the guys out there really should accept that the metric system is a great
thing and inches, feet, yard, etc.. is very complicated and difficult to calculate with. i also believe
they have a better feeling of a millimeter than we have of 5/8 inch or so...)
the speed now is clear for me, but may you state which size of motor this is, the estmated dimensiones
would say all, i can't see this on the page because i don't know how much space the plugs use.
i would also use a simple belt to get it matched, but this may be a problem for them because of the
holder in between the motors, a belt there would be a problem..
i also would be interested in the holes actually in the tube where the etchant leaves for hitting the
pcb, the number, arrangement (equally spaced, more on top/bottom, are they in a straight line or spiral
like)
i believe i can make this for zero cost, all the things i need i would have at home. some electrical pvc
pipes, plenty of motors, i really think i can do this for free (worktime is another issue).
i think it would be a good idea to not let the whole pipe protude through the top of the can, i would
fix some plastic bearing at the bottom (a small plastic pin greased by etchant) and on the top also only
a thin axle staying out, with a belt wheel and belt connected to a motor on the side.
a questions for the professionals here:
which glue resists HCL (CuCl2) etching? (does silicone or acrylic mass resist?)
and would it be enough oxygen regenerating the etchant when leaving the sprayer on some time?
regards
st
>Hi Stefan
>
>>hi
>>
>>this link is great!
>>as i'm from austria it won't be a problem buying.
>>but i'm also wondering if you may describe the function of the spray tubes more exactly.
>>it would be very fine if you may describe how the end of the rotating tube is looking, if its simply
>>open or if there are some propeller blades or so in.
>
>The tube is closed with a plate at the end where it's delved into the
>Fe3Cl, but the plate is having three holes. The diameter of the holes
>is aproximately 4 to 5 milimiters (sorry folks, I'm not that good with
>inches).
>
>>the estimated rotating speed, number of holes, size of holes, arrangement, etc, etc... would all be
very
>>fine.
>
>The speed is fairly high. I haven't measured it, and I hope you
>understand that I don't intend to measure it (how anyways?). The
>electro motor is directly linked to the tube, or in other words, the
>tube is directly mounted to the motors shaft. This may explains why
>the whole thing needs 5Amps when running.
>
>>I really believe this design is genious, shows that not only the americans and englishmen can invent
>>genious things.
>
>Yes, the principle is ok. It was however invented (and patented) by a
>company called Bungard. So, Radix actually copied the principle which
>is fine since the original patent is no longer valid. Bugnard is still
>selling such devices (at a much higher price though) which are said to
>operate better. It's as always - you get what you pay for.
>
>>it keeps the whole motor assy out, no shafts, no hoses.. simply very interesting.
>>
>>i also believe it would not be a very difficult thing to make this myself (it is not so cheap at all i
>>think)
>
>As always, the details may become difficult. I do agree that it's
>doable, but I'm sure you spend more money until you are there. Well,
>definately magnitudes more money if you charge your time also.
>
>>i also think of using maybe two tubes on one side, to get it more smooth and build it single sided
only.
>
>The two sided model does exaclty this. Note though that they are
>sorting out motors to get pairs that turn at the same speed.
>Personally I probably would rather use one motor and either toth
>wheels for two tubes or even better belts.
>
>>so thanks markus, i believe this is a great page.
>>but i also think this guy really doesn't want to sell to us or gb.
>
>From what I know he will be happy to sell such etchers to everybody.
>
>>but they can built this themselves i think...
>>i really don't want to comment his attitude to selling to us and really hope none of the us guys here
>>can read the german statement on the linked page because i really want nobody to think all people
think
>>so. i also don't like what's going on in some countries (you know what i mean) on but i think we are
>>here to discuss homebrew pcbs and not politics.
>
>My statemet was (and stiill is) not intended to start a poliltical
>discussion. That's not the right spot here. My statemet was there to
>clearly state that I do NOT share this opinion.
>
>Markus
>
>>regards
>>st
>>
>>
>>
>>
>>23.04.2003 11:17:36, Markus Zingg <m.zingg@...> wrote:
>>
>>>Hi Group
>>>
>>>This is my first time post here, so please forgive me in case this is
>>>already known. However, there is a small german company selling very
>>>low priced spray etchers which are not that bad. There is a model that
>>>etches one side, and also one that etches two sides at once. However,
>>>the single sided model can also be used for double sided PCB's by
>>>simply turning the PCB once one side is etched. The signle sided one
>>>goes for ~117 Euro (about the same in USD), the double sided one goes
>>>for ~178 Euro. I have the single sided one and I'm pretty satisfied
>>>with the results. The advantage of this etcher is that the device is
>>>"always" ready, there is no mess with etchant since it's a closed box
>>>and etching goes fairly quick also (3 minutes per side). The principle
>>>is simple. There is a rotating tube that delves on the bottom of the
>>>box into the etchant. Since the tube is having fine holes, the etchant
>>>is forced out of these holes due to the rotational speed of the tube,
>>>this results in a fine spray of etchant going over the PCB. Even
>>>though the device is simple I would find it hard to build the same
>>>device on my own for the same price. Let me stress that I'm not at all
>>>related to this firm. I'm simply a happy user of one of their
>>>products.
>>>
>>>Here's the link, search for "Sprühätzer".
>>>
>>>http://www.radixgmbh.de
>>>
>>>A word of warning though. The guy running this site aparently is
>>>having a problem with the foreign politics of the US governement. Let
>>>me stress that because of this I really thought twice to publish this
>>>link here but then the etcher is simply too good to be ignored.
>>>
>>>Markus
>
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