bebx2000 wrote:
>
> Could anyone offer an opinion on this drilling fixture?
Hi, i remember some old discussions on this list about a drill press
that I could never understand how it works, until saw that image. I
tried to search the thread but i lack time right know.
If i understand it right, and in my modest opinion, it intends to drill
the single sided board from the non copper side, because the drill bit
tends to slide if drilled from the copper (if it hasn't a etch hole for
drilling) and avoids the annoying burrs on copper. It has a light to
illuminate the bottom side of the board and when it cross the glass it
will behave like a mirror to your point of view, because it has more
light from the other side, and you see the down side of the pcb with the
alignment hole. There are who adds a mirror so you can see the bottom of
the pcb from above, in a comfortable position.
But i, before the cnc, just bought a proxxon drill stand and both a
collet chuck proxxon spindle for carbide bits and another with 3 jaw
keyless chuck from proxxon too for hss and other tools. All the pcb's i
hand drilled had the etched hole, never went through this.