Homebrew PCBs

I think it would take a diamond or ceramic hone to sharpen. Can you
get a flat ceramic hone? As the other poster says, turn while rubbing.
Doesn't really matter if it is off center a bit after you are done.

How much weight? I just filled all the empty space in my pen with
small lead shot. The advantage was that before I weighted it down it
had occassional skips where it wouldn't quite scratch all the way
through the coating.

Steve Greenfield

--- In Homebrew_PCBs@yahoogroups.com, "onenastyviper"
<oneNastyViper@h...> wrote:
> 
> Hi guys.
> 
> I am using an HP 7475A for scratching using a modded pen and solid 
> tungsten-carbide bit (a bit from a Wickes tile scribe) any ideas on 
> how to sharpen this bit??
> Also, what are the advantages to adding weight to the bit?? How much 
> max weight?
> 
> 
> PK