Homebrew PCBs

Build this one..  

	http://buildyourcnc.com/default.aspx [1] 

	it has a full set of videos explaining how to do everything. 

	one error I found is in the plan of the sheet of wood they use at
the start - the maths is a bit off on the physical size you need, but
everything else seems ok. 

	I am mostly done building mine,  Z and Y axis done, I am workiing on
the X as i get the time. 
 (I will also re-build my Z as I'm not too happy with *my* build
quality). 

	-Jim
 On Wed 10/08/11 3:33 PM , Mark Lerman mlerman@ix.netcom.com sent:
 You should be able to do 7 mil or smaller traces with a reasonably 
 good cnc. As has been discussed before, the good pcb machines "map" 
 the contour of the fr4 to compensate for the waviness. I have a
model 
 that does not do this, and it really is a problem - sometimes the 
 traces are too deep, other times too shallow. This problem is 
 especially exacerbated if you use V shaped tools (much cheaper) 
 rather than standard ones. As you implied, it is exchanging one set
of problems
 for another, but when it works well, you have a finished, drilled, 
 two sided board. You can't beat that!
 Mark
 At 09:59 AM 8/10/2011, you wrote:
 >I wanted to rekindle the discussion about using CNC for pcb
fabrication. I
 >love the toner transfer method, but I hate the chemicals and the
drilling. I
 >think a CNC would alleviate this.
 >
 >What I have learned from this group and CNCzone forums is that CNC
is a
 >whole other rabbit hole, but can be worth the time and effort. My
questions
 >are:
 >
 >1. Can I reasonably expect to get enough resolution to create
designs that
 >use such things as SOIC and even TQFP IC packages from a CNC kit?
 >2. Is the fact that the FR4 is not flat (has peaks and valleys)
going to
 >make it impossible to perform the CNC process of creating boards?
 >
 >
 >What do big board houses do? Do they etch chemically or use CNC
techniques?
 >I would think they would load a 4 foot by 8 foot sheet of stock and
etch it
 >all at once.
 >
 >It would be really neat to just load in some double-side copper
cladded FR4
 >and have the cad drawing etched and drilled. I remember someone
saying that
 >small board houses were run out of business years ago because of
 >environmental concerns, but I am not sure this has anything to do
with it.
 >
 >
 >Chris
 >
 >
 >[Non-text portions of this message have been removed]
 >
 >
 >
 >------------------------------------
 >
 >Be sure to visit the group home and check for new Links, Files, and
Photos:
 >http://groups.yahoo.com/group/Homebrew_PCBsYahoo [2]! Groups Links
 >
 >
 >
          


Links:
------
[1] http://buildyourcnc.com/default.aspx
[2] http://groups.yahoo.com/group/Homebrew_PCBsYahoo
[3]
mailto:Homebrew_PCBs@yahoogroups.com?subject=Re:%20%5BHomebrew_PCBs%5D%20thinking%20about%20buying%20a%20CNC%20kit%20such%20as%20%20the%20Bluechick%20kit
[4]
http://groups.yahoo.com/group/Homebrew_PCBs/post;_ylc=X3oDMTJxbjNuYmFpBF9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBG1zZ0lkAzI4NjY4BHNlYwNmdHIEc2xrA3JwbHkEc3RpbWUDMTMxMjk4NzA5Mw--?act=reply&messageNum=28668
[5]
http://groups.yahoo.com/group/Homebrew_PCBs/message/28667;_ylc=X3oDMTM2bjhqYmo5BF9TAzk3MzU5NzE0BGdycElkAzQ1MDUzNjEEZ3Jwc3BJZAMxNzA1MDgzMjkxBG1zZ0lkAzI4NjY4BHNlYwNmdHIEc2xrA3Z0cGMEc3RpbWUDMTMxMjk4NzA5MwR0cGNJZAMyODY2Nw--
[6] http://groups.yahoo.com/group/Homebrew_PCBs


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