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July 2007

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Tue, 10 Jul 2007 07:36:15 -0500
Content-Type:
text/plain
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text/plain (72 lines)
Jeff,
Usually, FR-4 does not have edges sharp enough to cut fingers if the
routing is done perpendicular to the surface. Do the boards have copper
out to the edges of the cutouts (routings for singulation) or to the
edge of the individual PWBs or the edge of the panel?  Standard design
practice is to keep copper planes and traces back some distance from the
edges (usually .050") to prevent shorting to hardware, or to the cabinet
or frame that the board goes into. This also prevents layer-to-layer
shorting due to copper smear from cutting or milling the PWB. If copper
is exposed along any side, it is like having a small exacto knife
embedded in the side of the FR-4.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of McGlaughlin, Jeffrey
A
Sent: Tuesday, July 10, 2007 6:23 AM
To: [log in to unmask]
Subject: [TN] Injury by array

Oh wise and wonderful members of tech net -

We have had to incidents in the past six months where assemblers have
been cut while handling assembly arrays (2-up panels) for one of our
products. This has elevated the issue to "Panic Mode" due to the
involvement of EHS&Q (environmental health, safety and quality). As the
designer of the array I have been given ownership of the issue and am
task with resolving it.  After 20+years of handling boards and arrays I
have never been cut, so I am unsure as to what if any corrective action
can be taken to prevent future injuries.

The specifics on the arrays -
10.5" [267mm] x 12.0" [305mm] x 0.062" [1.6mm] thick
2 - up for 4.7"[119.3mm] x 9.2" [233.6mm] PCB Minimum rail 0.38"[9.5mm]
Tab Route and Retain (mouse bite) Injuries occurred during loading of
the solder printer and during slide line operations for post reflow
assembly. 

Any suggestions on what to tell our production group?

Jeffrey McGlaughlin, CID
Engineering Designer
Battelle
505 King Avenue
Columbus Ohio 43201-2693
(614)424-7582 Phone
(614)458-7582 Fax
PS Don't you just love all those  management buzzwords (underlined.)
>;-D

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