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September 1997

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Subject:
From:
"Anderson, Greg (MIS, GEFanuc, NA)" <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Wed, 3 Sep 1997 08:14:41 -0400
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Drilbert,
        We used to have this problem from time to time.  Believe it was
almost always related to static.  You may want to review your vacuum
static dissipation lines, from the spindles all the way back to the
collection system.  We ended up with a braided ground wire around each
of the spindle dust tubes, and a direct earth ground at each drill &
router.  Maybe overkill, but this seemed to knock down our problem.

Greg Anderson
Adv. Mfg. Eng.
GE Fanuc Automation

        ----------
        From:   drilbert[SMTP:[log in to unmask]]
        Sent:   Tuesday, September 02, 1997 10:11 PM
        To:     [log in to unmask]
        Subject:        [TECHNET] missing hole defects

        We have experienced an intermittent missing hole (not drilled)
defect on
        one part number.  On each of 20 panels I have analyzed, the same
hole is
        missing.
        The entire drill file is intact on the mainframe, however, some
kind of
        glitch must be occurring either during downloading the data
across the
        DNC or executing the program on the drill machine.
        We use Hitachi drill machines.
        Has anyone run across such a problem, or does anyone have an
idea what
        might be the cause of this mystery?

        drilbert


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