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July 2001

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Subject:
From:
"<Peter George Duncan>" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 25 Jul 2001 10:42:49 +0800
Content-Type:
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Most visual board inspections involve moving the board through various
small angles to catch the light and see into little nooks and crannies, and
the feedback loop to control where and how to move the board is the
inspector's hand to eye. If the board is held by a jig instead, the
feedback loop is broken unless the inspector moves either the jig or
him/herself to view the board - much more tiring and less ergonomic than
handling just a board, unless your jig is robotic and can be minutely
controlled with a joystick or similar. Rather an expensive solution!

Perhaps you ought to put your inspectors on an exercise and fitness
programme to build them up, and maybe give them a break doing something
that uses a different set of muscles every couple of hours to relieve the
strain. Or you could investigate wrist or arm supports. I have a
handicapped nephew who has practically no muscle power. We found some
forearm rests for him that swivel and pivot and clamp to the arms of his
chair. These support the weight of his arms while he reaches out to pick
things up or manipulate them. Your inspectors would then have support to
reduce the strain and still have their feedback loop for efficient
inspection. They offer a remarkable degree of movement in one plane, but
that's probably all you really need. Any slight up or down movements to get
proper focus can be achieved with the inspector's wrists.

Good luck!

Pete Duncan




                    Mike Sewell
                    <MikeSwll@AOL        To:     [log in to unmask]
                    .COM>                cc:     (bcc: DUNCAN Peter/Asst
Prin Engr/ST Aero/ST Group)
                    Sent by:             Subject:     [TN] Inspection
Jig/Support
                    TechNet
                    <[log in to unmask]
                    ORG>


                    07/25/01
                    05:29 AM
                    Please
                    respond to
                    "TechNet
                    E-Mail
                    Forum.";
                    Please
                    respond to
                    MikeSwll






I'm looking for a moveable/articulating jig to hold a PWB during visual
inspection with a microscope.  The issue is the board's weight over 9 -
10hr
shift wearing down the inspector(s).  Dunno if this is would be a
counterbalanced arm/swivel ... curious to see if anyone has any thoughts or

similar experiences.

Thanks in advance,
Mike Sewell

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