John,
OK ... I used to have the same problem with drills until I started using
solid carbide, It seems they never wear out.
Have you tried a 0.031" ball nosed mill in solid carbide, I feel sure it
will last a long long time...
Price is not that bad...
http://www.drilltechnology.com/drill/endmill/Micro_EndMills_2_Flutes_Ball_Nose.htmlhansw
crankorgan wrote:
> Hans.
> When you mill a board, you hit the board material. The copper
> is soft. The glass epoxy board is like sand paper to the bit. I
> used to coat the board with motor oil before milling. It only helped
> to keep the dust down. Lets face it, there is no easy way to make
> PCBoards. Every method has its drawback.
>
> John
>
>
>
>
>
>
>
> --- In Homebrew_PCBs@y..., hans@c... wrote:
> > Alan,
> > The Gerber files include "empty" layers. The Modular design is a two
>
> > sided PCB, simply discard the empty layers.
> > BTW I do not mill boards it's far too mauch work, I use Pre
> Sensitized
> > stock and exposure for 120 second using a GE 500W bulb,
> > then developing in a solution of Red Devil Lye, etch with Ferric
> > Chloride, the same Ferric Chloride I have been suing for 8 years !,
> most
> > people do not understand it, and they throw it away far too soon.
> Heck I
> > even use the same Red Devil Lye mixture until it's so green I can
> hardly
> > see the PCB developing.
> > .... I can make a two side board (without drilling) in about 45
> > minutes... 5 mill traces at 8 mill spacing are normal.
> > BTW mill bits, I wonder why mill bits wear out so quickly, after all
>
> > it's only copper! Could it be because people run the bit dry ? May
> be
> > people are not buying real mill bits...
> > I have a link at my site for a source of really good quality mill
> bits,
> > size down to 0.002" ( yes! 2 mil ) But 2 mil bits are not that
> cheap....
> >
> > hansw
> >
> >
> > Alan Marconett KM6VV wrote:
> >
> > > Hi Hans,
> > >
> > > That's quite a nice project! I think I counted 8 layers in one
> of the
> > >
> > > GBR files! And with over 20 apertures, I'll have to get a parser
> for
> > > the header working! I think I can pick a layer or two with pads
> and
> > > traces, and manually build an aperture table for some simple tests
>
> > > with
> > > my code. I was able to see a lot of the "foil" layers by using
> some
> > > aperture sizes I had defined previously for another (Eagle) demo
> > > board.
> > >
> > > Thanks for the URL!
> > >
> > > Alan KM6VV
> > >
> > >
> > > hans@c... wrote:
> > > >
> > > > crankorgan wrote:
> > > >
> > > > > What I find is people are unable to find anything on
> > > > > the internet. Maybe they use the wrong search engine.
> > > >
> > > > I posted a complete design with PCB layout files and schematics
> at
> > > my
> > > > web site, during
> > > > the past years I have received 100's or emails from people that
> have
> > >
> > > > successfully built the
> > > > Modular Design, with or without the "Smart Current Monitor".
> > > >
> > > > The design is Free... I do not charge anything for it..
> > > >
> > > > When I get time I'm going to post a new design complete with
> EAGLE
> > > > files...
> > > >
> > > > Hans W
> > > > http://hans-w.com
> > >
> > >
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