Well spotted George, I wondered who would be the first to spot that one!
We are fortunate that we have a scan-print-copy system, so we can scan to
PDF or Tiff up-to A0 size.
It would be necessary to create a Tiff file for import rather than PDF.
As others have pointed out, this is a bit down-and-dirty from the
recipient's drawing production point of view, but does protect your original
vector file from tampering.
Good point. If you have a carefully controlled drawing issue procedure,
then you will keep an electronic copy of the file at the time it was
So you can go back to the version you sent out.
The main problems occur when others tweak your drawings without reference,
to suit their own ends.
At this point everything seems to work on paper, and the tweaks are only
discovered at the assembly stage.
We routinely use civil dwgs and erase/turn off items not needed on our
dwgs so that our plumbing/electrical work shows up better and less
cluttered. We always put the "See Civil drawings for site work" etc in
our specs and on drawings. If we couldn't use the civil drawings we'd
just end up redrawing it or scan tracing the drawings then reduce the
civil guys fee accordingly.
It is acceptable to send actual CAD data to others. But you must
designate a control source in case someone edits the CAD data to
support their needs. A good control source is a PDF document as it is
cannot be changed. You will need to document your process. I
designate my engineering deliverable as the PDF file. I also send CAD
data to them so they can use it in their designs or whatever. I also
add custom properties to the PDF file designating release dates and
other info. Case in point; One customer decided to override this
concept by converting the data via AI, manipulating and turning it
back into a PDF. Of course the resulting PDF file was missing these
custom properties. We caught this quickly. iQ
I'm intrigued. Why would they go to such lengths? Was it just forgery,
or historical revisionism? I can imagine someone trying to pass off
one of your designs as theirs and I guess if a 3rd party had screwed
up, it might be useful if they could make it look like your blunder,
but it sounds like some other motive was at play here. It also sounds
as though you thought it might happen, hence the safeguards you've
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