Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

thanks for the suggestions.

The fork thingy i can imagine quite well, i thought about that too (but i
don't think fork is the right
word for it.....
But i'm not sure if i really like te idea much.....


PVC is not bad, i agree with that.


I want to describe the holder of a bungard unit i once used:

it consits of two vertical metal rods, maybe 4mm diameter and 30cm long.
between the vertical rods on the bottom is a plastic bar.
this plastic bar is fixed to the rods, on their ends.

On the top of the plastic spar every 50 mm or so is a small metal stub
post,
with a V groove running parallel to the plastic bar.

Another plastic spar is parallel to the bottom bar, with similar metal
posts
which face downwards.
This second bar slides on the vertical metal rods, and is fixed wirh metal
screws in position.

The pcb is put between the two plastic bars and rests in the V-grooves of
the small metal stub posts.


This setup was used in a bungard spray etcher. with ferric cloride.



As it looks no metal is good in HCl (affordable metal i mean).



So my initial thought was to reconstruct the bungard holder i have seen but
using
carbon tubes instead of the vertical metal rods. metal stub posts and
screws replaced by plastic too.


The main problem with this unit was that it was impossible to etch pcbs
smaller than 5cm. (they won't hold).

I don't clearly remember if there was copper left where the v-grooved
holders touched the board.

I wonder if it would be a good idea to make this v-groove the whole length,
or at least at much shorter intervals
to allow tiny pcbs....


Well, you see, I'm quite biased on this topic.

Another issue is agitation - which method would be good to agitate the
holder with the pcb if i won't use air agitation? a small motor oscillating
it somehow?

I know markus you have included this in your plating station - how do you
move your fork?


I'm still very interested in any discussion and further hints.

thanks

ST