Homebrew PCBs

Stefan Trethan wrote:
> On Mon, 06 Jun 2005 18:42:53 +0200, Brian Chapman  
> <cornbeltroute@...> wrote:
> 
> 
>>1) Power spray etching unit -- home built from plans found on Randy
>>Gordon-Gilmore's home page. Randy, a (mechanical?) engineer, has
>>worked through three iterations of etching machinery, and his home
>>pages contain great info. No doubt a number of members here know all
>>about Randy's etching developments.
> 
> 
> 
> Hey the page of R.G. is interesting, didn't know that one.
> <http://www.prototrains.com/>
> 
> He uses a pump to spray the etchant. too bad i didn't buy that all  
> glass/teflon chemical pump on ebay..
> 

Most small chemical pumps do not have the pressure required for optimum 
nozzle performance, which is > 1 Bar (100kPa). These include magnetic 
drives. Yea sure you see magnetic drive pumps in professional pray 
equipment but take note at the size/price of these pumps. I've did a LOT 
of research on pumps when building my hobby CuCl2 spray etcher and the 
best (only) pump I've found suitable was the 12V Flojet brand pumps sold 
for caravan use.

Adam