Homebrew PCBs

Arnie,
      I buy 4" X 6" single sided boards. I mount the board on a piece 
of 1/4" pvc plastic which is mounted to the bed of my machine. The 
blank board is held by the edges to the PVC using the heads of 4-40 
bolts. The board is held on three sides with two bolts per side. one 
bolt is added to the forth side after the blank is slid in and the 
bolts tightened. Because the tip of the bit is triangular, variations 
in board thickness and flatness do not show up if you stick with 
boards 4" X 6" or under. The real machine has an adjustable foot and 
a vacuum system to remove the dust so it does not affect the foot. 


                                           John






--- In Homebrew_PCBs@yahoogroups.com, "acfrankenberger" 
<acfrankenberger@y...> wrote:
> I wasn't planning on using a depth guide. If I keep the boards flat 
> will I be ok, or am I kidding myself?
> 
> Thanks,
> Arnie
> 
> --- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan 
> <stefan_trethan@g...> wrote:
> > why don't you use a household hoover with a flexible
> > hose (for electrical installations there are thinner ones) to get 
> rid of 
> > the dust?
> > 
> > the glass is bad for the bits...
> > 
> > 
> > here nearly anyone offering fr4 has phenolic too...
> > 
> > any supplier should have it..
> > 
> > i can't tell you names because i am too far away...
> > 
> > 
> > you should have a sliding milling depth guide for isolation 
> milling. have 
> > you?
> > 
> > st
> > 
> > On Mon, 18 Aug 2003 20:08:05 -0000, acfrankenberger 
> > <acfrankenberger@y...> wrote:
> > 
> > > I have a Taig mill I was hoping to use to mill out (trace 
> isolation) and 
> > > drill some circuit boards. Would phenolic based boards make the 
> milling 
> > > process less demanding on the tool bits?  Could I avoid dust 
> collection?
> > >
> > > Does anyone have a source for phenolic copper clad boards?
> > >
> > > Thank you,
> > > Arnie
> > >
> > >
> > >
> > >
> > > Be sure to visit the group home and check for new Bookmarks and 
> files:
> > > http://groups.yahoo.com/group/Homebrew_PCBs
> > >
> > > To unsubscribe from this group, send an email to:
> > > Homebrew_PCBs-unsubscribe@yahoogroups.com
> > >
> > >
> > >
> > > Your use of Yahoo! Groups is subject to 
> http://docs.yahoo.com/info/terms/
> > >
> > >
> > >