> derekhawkins wrote:
>
> I'm attempting to debunk the following two
> myths at the same time;
>
> 1. A collimated light source is needed for
> .005" to .01" rules when photoetching.
>
> 2. All vertical bubble etching system cause
> uneven etching.
>
> Board size is 6"X4" hung vertically as shown.
>
> http://www.pbase.com/eldata/6_6_rules
Nice etching.
I agree collimation is not needed and bubble
etching works well. I currently use both an
uncollimated light source and a kinsten
bubble etcher.
My main problem I have with getting to 6/6 is
my phototool.
Printing on my personal laser I can do a 6/6
board FILLED with 6/6 like you have shown but
if I try doing a a board where 1/2 the board
is 6/6 and the other half has large areas of
copper I get problems. During the develop
I either need to leave it too long for the
large copper areas to be pitted or I take it
out too soon and I get shorts in the 6/6 area.
I just use a little laserjet 4xxx myself. It
just can't seem to do big black areas well.
The big laserprinter I borrow works well for
large black areas - but it is a half hour ride
to get to use.
How do your boards go with 6/6 AND wide tracks
mixed on a single board ?
I am going to build a think and tinker style
collimated box - but I don't think it is
going to make a noticeable improvement.