oops..
Yes its FR4 from radioshack. I found their board has much smoother surface than the junk I got on ebay. The smallest trace is probably around 8/9 mil. The board didnt come out perfect but it was a good test to see how well my system was working. I'm not sure I would mill a board this fine and expect it to work but it looks like it could be done.
matt
--- In Homebrew_PCBs@yahoogroups.com, "buckeyes1997" <buckeyes1997@...> wrote:
>
> Hello
> Yes that is the same 90 bit I used. I have tried some 60 degree bits and maybe a 30 degree. I thought the 30 cut too deep to make it useful. The 60 was okay but again cut deep to get trace spacing. The 90 cuts shallow to get good spacing.
>
> The trick here is to measure the board and compensate for the board not laying flat or being tipped. If you cut the board and one section is lighter cut than the other then the board is not flat or aligned properly. You can either manually align it better or comp in software. I chose to comp in software.
>
> Matt
>
>
>
> --- In Homebrew_PCBs@yahoogroups.com, joe M <joe9mail@> wrote:
> >
> > Hello Buckeyes1997,
> >
> > 90 degree cutter cut was very smooth without any burr. But, it did not
> > provide much leeway when the pcb is not very smooth. Even a mil difference
> > was leaving small islands of Cu.
> >
> > Did you use the 90 degree cutter from here?
> > http://www.precisebits.com/products/carbidebits/scoreengrave.asp
> >
> > Is that an FR-4 board or a paper phenolic board? btw, What is the size of
> > the smallest trace on that pcb in the photo?
> >
> > Have you tried other bits before deciding on the 90 degree cutter bit?
> >
> > Thanks
> > Joe
> >
> >
> >
> > On Thu, Dec 13, 2012 at 10:55 AM, buckeyes1997 <buckeyes1997@>wrote:
> >
> > > ∗∗
> > >
> > >
> > >
> > > I have had very good results with 90 degree cutters.
> > >
> > > PCB cut with 90 degree bit
> > > <http://xa.yimg.com/kq/groups/4505361/sn/588202274/name/pcb_3.jpg>
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>