little OT : drilling pcb's

[Jim Patchell]

    To drill fiber glass, you really should be using carbide drills.  High
speed steel (HSS) is just plain to soft (you are after all drilling through
glass fiber, which is very abrasive).  The second choice is cobalt alloy
drills.  These are a lot harder (and more brittle) than high speed steel, and
more expensive (although, not as expensive as carbide) and should last a bit
longer.

    -Jim

Dr. Jörg Schmitz wrote:

> I etched 12 PCB's the last two days, and now I'm going to drill them.
> The problem is : the drill grows blunt after 20 - 30 holes, and I have to
> take
> a new one. I use expensive 1 mm HSS - drills, which should work, in my
> opinion.
>
> Anyone any idea, who to do this work economical ? (I.e. not 12 drills for 1
> PCB
> but 1 drill for 12 PCB'S)
>
> J.S.
>
> ________________________________________
> Dr. J. Schmitz
> http://www.patho.bonn.com
> http://members.xoom.com/jmschmitz
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