Homebrew_PCBs

Hello,

THAT WAS A GREAT LINK! (Yes, I'm shouting<G>)

The specific page doesn't load correctly, but most of the rest of the
site does. Just click on something across the top... I chose products.

Thank you!.

Ballendo

P.S. Why the tv and all that? Just use a laser pointer above, a
dremel below, and a spring loaded table. This could be a pretty
decent setup, IMO. Line up the laser with the dremel tool tip, and go
to town!


--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
<stefan_trethan@g...> wrote:

>
> > Wait a minute. Most of you guys are saying that I should drill by
> > hand instead of by using the press. I thought that what the press

was

> > for to get more accurate drills if that is the correct word. Can

you

> > guys elaborate on why hand drilling is better?
> >
> >
>
> No, it is not better at all..
>
> Carbide drills will produce better quality holes, less burr,

straight,

> etc..
>
> But you need to align the drill tip and board exactly.
>
> with drilling by hand the hole in the copper catches the drill and

centers

> it much easier.
> The disadvantage is you can not use carbide because it would break.
>
> If you have a press already i would use it. you have to align the

drill

> properly,
> that is the only way then.
>
> the other two possibilities are a cnc or such a professional

optical

> device.
> You can see them at

<http://www.megauk.com/pcb_drilling_machines.php> but

> the page is down.
>
> It is a "upside down" drill press. the drill comes from the bottom,

on the

> spot on the top
> a viewing device is aimed. it has a screen and a target drawn on

this

> screen. you simply
> line the pad up with the target and press a switch. then a foot

comes down

> to hold the pcb
> and the drill comes up.
>
> We were thinking it must be possible to use a camera under a

standard

> drill press for this too.
> maybe you need to use a mirror or something because the camera lens

would

> get full of dust.
> maybe a vac sucking the dust up is the best way.
>
> Then use a old small TV to view the picture. you can even draw

rings on

> the tv to aid in centering.
>
> It is most likely you need no foot holding the pcb here, the

pressure of

> the drill helps holding it still
> while in the upside down setup it lifts it up. you also can simply

operate

> the drill press manually.
>
>
> I guess it is a good approach if you already have a press and

carbide

> drills. such a camera is really cheap
> and a small TV is no problem i would say..
>
>
> Stefan