[CCTALK] [CCTECH] scanners & circuit boards... - test-drb@ccmp.vtda.org

16 May 2002

...
 From: Tothwolf &lt;tothwolf(a)concentric.net&gt;

On Thu, 16 May 2002, Davison, Lee wrote:
  Tothwolf wrote:

  I'd be more concerned with accidentally
scratching the glass bed of
 the scanner due to sharp component leads.  
 You can't scratch glass with metal. What you can do is leave a thin
 trace of metal on the glass. Gewelers rouge will easily remove this is
 nothing else will. 
Are you sure? I've scratched glass with metal before, though not with a pc
board. Most component leads (excluding some of the newer resistors and
capacitors) are made of a tin plated copper or a copper alloy anyhow, so
it would seem that they would be less likely to damage something than say,
steel.

Since we are talking about scratched glass, do you have any ideas on how
to remove scratches from the face of a CRT? 
Hi
 Jewelers rouge will remove scratches from glass. It does
depend on the depth. The reason I know this is because
I am also an amateur telescope maker and rouge is a common
material used to polish glass. If the scratch is deep,
you'll need to grind with something like 15 or 5 micron
aluminum oxide.
 You'll note that both rouge and aluminum oxide are both
oxides of common metals. These are harder than glass and
can scratch glass under the right condition. Also, carbon
steel wheels are used to scribe glass ( but this isn't
scratching, it is fracturing so this doesn't count but
the results look the same ).
 Contact me off group and I can help with your CRT problem.
Dwight