Hi,
Don't get confused. The milling bit only makes a tiny starting
hole in each pad. A mechanical etching bit is tiny on the end. Some
people put a tiny circle in their drawings. This lets the acid create
a starting hole for the drill. I used the same concept in my DXF file.
The depth of the starting hole is only as deep as you mill the board.
I then drill my board with a N0.60 bit. I know this is a little
large but I have found this lets me put in all my parts with one
size hole.
John
--- In Homebrew_PCBs@y..., "marble_h" <marble_h@y...> wrote:
> What is the most common size dill bit used in PCB work ?
>
> John I noticed that in your G-code that you used the same size bit
> for both millimg and drilling what size was it .I was thinking of
> useing a 1/16 bit but the machine I can use has a 3/32 as the
> smallest right now . I think that is way to big .I was thinking of
> useing a #55 dill size for the paths ( 1/16 is bigger I know ) and
> #60 for the mount points these may be to small any thoughts (John)
> (Group)
>
> What is the best to use By the way I am makeing the 3amp driver
> from Steve Blackmore on his site . I have almost completed the
files
> meeded to make the G-code . Now I know why G-code is so protected
if
> you make one up .
>
> John Brauweiler