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January 1998

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Subject:
From:
Andy Kowalewski <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 27 Jan 1998 06:55:10 +1100
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Hi All,

A technique I've seen used to get into the inner layers of a ML board
uses a dentist's drill. The bit spins at around 400,000RPM on compressed
air bearings and the tungsten tip gives absolute and total control. I
saw a technician excavate his way into the centre layers of an 8 layer
board using an ordinary illuminated bench magnifier for precision, and
the result almost blew me away. I had a go at it myself, and the degree
of control is astounding. I guess just as well - you would want your
dentist to have absolute control, right?

By the time he'd finished his repair, I was hard pressed to find the
point of entry as the cut had minimal width and no extraneous damage.
--

Cheers

.......Andy K.

=======================================================================
Andy Kowalewski                         Phone:  +61 3   9264 3767
PCB Design Engineer                     Fax:    +61 3   9264 3507
NEC Australia                   email   [log in to unmask]
                        Mobile: Australia               0412 281 284
                                International   +61      412 281 284
=======================================================================

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