Re: [Emc-users] Spindle speed control with cnc4pc board

[rogerb]

On Tue, 25 Dec 2007 23:19:49 -0600
Jon Elson [EMAIL PROTECTED] wrote:

 Dave Engvall wrote:
  If anyone wants to etch a disc I can probably find an 30 mL or so
  of KPR.
  
 KPR is abominable to work with.  I have DuPont Riston dry film 
 photoresist.  I have laminated it onto .005 and .003 brass 
 shim stock with my dry film laminator machine.  It has heated 
 Silicone-coated rollers that press the film onto the substrate. 
   I have to shim the bottom side with cardboard as the machine 
 was set for .062 PC board material.
 
 I make two mirror-image films on my photoplotter and align them 
 on a light box before wrapping them around the laminated shim 
 stock, then expose, develop and etch like a PC board.  I still 
 get some undercutting, my ferric chloride may be worn out.
 
 I've been using this to make solder paste stencils for SMT 
 circuit boards, but one could make an encoder with similar 
 technology.
 
 
 Jon


I've been using photo transfer with a laser printer  and a bath of
Hydrogen Peroxide and Muriatic Acid (28% Hydrochloric Acid)
I don't know if it will resolve the lines fine enough but it does fly
turd size resistor pads ok. Here's a link 
http://www.fullnet.com/~tomg/gooteepc.htm


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Re: [Emc-users] Which cad software?

[rogerb]

Could be a little of topic but I'm looking at getting a mini
mill for the shop and would like to go from drawing to tools. I run
linux on my computer and have win 2000 running under vmware.I have used
a few different softwre packages and they seem to suck (turbocad
acad,varicad,qcad).I want to use the mini mill to cut patterns so 2d
is the easiest  to work with for me.  Any suggestions are appreciated. 

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