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@... 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:
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