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Hi Terry,<br>
<br>
somebody on Internet suggests a mixed approach... use a laser
diode to engrave a black paint sprayed on a PCB,<br>
then use an ordinary etching method to produce the PCB...<br>
<br>
On this page :<br>
<br>
<a class="moz-txt-link-freetext" href="http://forums.reprap.org/read.php?133,235148">http://forums.reprap.org/read.php?133,235148</a><br>
<br>
you can read this :<br>
<br>
<blockquote type="cite"><i><span style="color: rgb(0, 0, 0);
font-family: Arial; font-size: medium; font-style: normal;
font-variant: normal; font-weight: normal; letter-spacing:
normal; line-height: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px;
display: inline !important; float: none; background-color:
rgb(255, 255, 255);">First I've coated some copper-clad PCB's
with black paint ...</span></i><i><br style="clear: both;
color: rgb(0, 0, 0); font-family: Arial; font-size: medium;
font-style: normal; font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal; orphans: auto;
text-align: start; text-indent: 0px; text-transform: none;
white-space: normal; widows: 1; word-spacing: 0px;
-webkit-text-stroke-width: 0px;">
</i>
<i><span style="color: rgb(0, 0, 0); font-family: Arial;
font-size: medium; font-style: normal; font-variant: normal;
font-weight: normal; letter-spacing: normal; line-height:
normal; orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: 1;
word-spacing: 0px; -webkit-text-stroke-width: 0px; display:
inline !important; float: none; background-color: rgb(255,
255, 255);">... then engraved the outlines with a diodelaser
with around 2Watts of 975nm-IR-light on a spot of 0.15mm
instead of milling them:</span></i><i><br style="clear: both;
color: rgb(0, 0, 0); font-family: Arial; font-size: medium;
font-style: normal; font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal; orphans: auto;
text-align: start; text-indent: 0px; text-transform: none;
white-space: normal; widows: 1; word-spacing: 0px;
-webkit-text-stroke-width: 0px;">
</i>
</blockquote>
There are also some photos...<br>
<br>
Could be worth trying... but first one should get hold of a 2W laser
diode...<br>
<br>
73 Alberto I2PHD<br>
<br>
<br>
<br>
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