John,
OK how about paper board. !
hansw
crankorgan wrote:
> Hans,
> I use micrograin carbide Mechanical Etching bits. Drilling is
> one thing. Speed can be lower than 16,000 rpms. Dragging the bit
> through the epoxy for 800 inches is something else. I contacted the
> place you are a consultant for. They were unable to supply a milling
> bit at that time for less than Think and Tinkers price. I tried all
> kinds of tricks. I think if somebody made a different kind of board.
> Something that is good for 50 volts or less. Use plastic instead of
> glass epoxy.
>
> John
>
>
>
> --- In Homebrew_PCBs@y..., hans@c... wrote:
> > 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_B
>
> all_Nose.html
> >
> > hansw
> >
> > 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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