On Mon, 16 Apr 2012 23:39:08 +0100, you wrote:
>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.
Agreed on the Proxxon. However, I have a design where I am
implementing the bottom drill with a Proxxon. Main problem right now
is the board holddown.
Harvey
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>