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Re: [PSUBS-MAILIST] DXF Files
Thanks,
I use them to send plates to be laser cut (as suggested by someone in
this forum) because the +/- 0.007" [0.18 mm] tolerance allows complex CAD
designed and hard to define parts to fit exactly together. That also
explains why AutoCAD R12 dxf files work excellent, but AutoCAD R13, 2000,
2002, etc don't.
To throw my hat into the 2D / 3D debate, I think that 3D is the wave of the
future, however anything can be done with 2D equally as well, and perhaps
faster than with 3D, depending on the user of course. We are in the
process of converting from AutoCAD (2D & 3D) to Inventor just now (over the
past year actually). We have tried 3 times in the past and each time found
that the software wasn't good enough yet (Solid Works, ProEngineer,
Inventor, Mechanical Desktop, Etc) and had to abandon the shift. This time
we are sticking with it, but it is of just marginal benefit (Timewise). It
IS the future though and the sooner one switches, the further we will be
ahead I believe.
I think that there are far more people, computer programs, etc. able to
read and utilize 2D dxf files and as such all OSS drawing files should be
so. That way it is more of an OSS PSUB. In fact there could be a case
made that to enable anyone (with or without access to a CAD package)
could build the OSS PSUB that all drawings should be in jpg form, ... but I
wouldn't go that far.
Anyone who feels that they need 3D files are likely competent to
build their own from the 2D OSS files in the standards ,ways,and files that
they desire.
Nuclear SUBs were built using 2D manual drafting, and so I think one should
be able to design, detail, and construct a PSUB from 2D drawings as well.
I don't mean to flame anyone, or annoy anyone, this is merely my opinion
for what its worth.
My 2¢ worth.
Jay.
Thanks,
J. Barlow CET
Sr. Mechanical Designer
BJ Pipeline Inspection
Ph (403) 531-5412
Fax (403) 236-8740
Cell (403) 807-2195
"Warrend Greenway"
<dub@linuxmail.org> To: personal_submersibles@psubs.org
Sent by: cc:
owner-personal_submersible Subject: Re: [PSUBS-MAILIST] DXF Files
s@psubs.org
13/01/2003 05:59 PM
Please respond to
personal_submersibles
Blah. They vary dramatically with ever version, and are implementatio
dependent. They are ascii, human readable files, with binary definition
codes inserted at critical intervals. You can actually open one and read
it if it is a simple part. It just defines coords and basic entities. You
will find a wealth of information on google. VRMLs are much cleaner files.
Warren.
>
> How do dxf files work? I am very curious.
> I have used them for years and have no inkling.
> Jay.
>
>
>
>
>
> "Warrend Greenway"
> <dub@linuxmail.org> To:
personal_submersibles@psubs.org
> Sent by: cc:
> owner-personal_submersible Subject: Re:
[PSUBS-MAILIST] OSS
> s@psubs.org
>
>
> 12/01/2003 10:42 PM
> Please respond to
> personal_submersibles
>
>
>
>
>
>
> DXF can store 2D. ??? What format would your recommend? I actually hate
> DXFs since I know
> how they work! I only recommended them because every CAD program I know
of
> can utilize them.
>
> Warren.
>
> > No DXF!!! 2D only!
> >
> > DWG or SAT for 3D (volume, mass info)
> >
> > Pierre
> >
> >
> >
> >
> >
> >
> > >From: "Warrend Greenway" <dub@linuxmail.org>
> > >Reply-To: personal_submersibles@psubs.org
> > >To: personal_submersibles@psubs.org
> > >Subject: Re: [PSUBS-MAILIST] OSS
> > >Date: Mon, 13 Jan 2003 09:31:52 +0800
> > >
> > >OK. You have a lot of opinions. :) Ready to help compile that list of
> those
> > >interested
> > >and the skills they bring to the table? A landlubber is perfectly
> suited.
> > >Furthermore,
> > >you seem to grasp the situation perfectly. I don't think we need to
> worry
> > >about a new
> > >server at this point, but I have a server I would offer to the cause
if
> it
> > >ever got to
> > >that point. What I would like to see is everyone who has expressed
> interest
> > >to either
> > >post their wish-list or e-mail them to myself or you...:) So we can
> compile
> > >a preliminary
> > >spec. It will probably change a bit as time goes on, but it will give
us
> a
> > >place to start!
> > >Please, all, spec the following:
> > >1. Length
> > >2. Diameter
> > >3. Speed
> > >4. Range or dive time
> > >5. Safe dive depth
> > >6. Cost window
> > >7. Further comments
> > >
> > >It seems like lead acid is the power source of choice. I can handle a
> PWM
> > >speed control,
> > >so I don't think we need to worry about potentiometers or anything
like
> > >that. Batteries
> > >and motor should probably be stored outside the pressure hull. Steel
> seems
> > >to be the
> > >pressure hull material of choice. Gauges and electronics should be
left
> > >flexible, to
> > >accomodate a variety of tastes, needs, and budgets.
> > >
> > >Let's agree to use DXF for electronic drawings and TXT or HTML for
text.
> > >
> > >Warren.
> > >warrend@decagon.com
> > >
> > >
> > > > Good Evening all,
> > > >
> > > > I just read all the posts since this morning... wow! You've been
> busy.
> > > >
> > > > OK... here goes. Carsten had some good points. I think if I spent
> > > > hours on end burning the midnite oil and then saw that somebody was
> > > > selling the plans in the back of Popular Mechanics... and getting
> rich,
> > > > I'd be furious.
> > > >
> > > > Now... open source does not necessarily mean the project could not
be
> > > > turned to profit making. There are lots of people making money
from
> > > > Linux, after all. I also wonder how we might control anyone who
did
> > > > decide to take the OSS design and start building and selling it...
> > > > copyleft documents would not do.... as such documents do in fact
> allow
> > > > one to reproduce and sell it. We need rather, a patent on any
> > > > intelectual property in the design to do this.
> > > >
> > > > I think that the best way to control commercial use of the project
> would
> > > > be to design it such that it would not be commercially viable.
I.e.:
> a
> > > > one person submersible could never be used to "give rides", and the
> > > > potential market for such a machine would be negligible. Liability
> > > > would kill it before the first dozen had hit the water.
> > > >
> > > > The other thing is that it should be stressed concept only. The
idea
> > > > would be for people to build their own machines to the
specifications
> in
> > > > the project documents... not for anyone to try to market a kit to
be
> > > > assembled.
> > > >
> > > > If we produce the plans and the documentation... this material
could
> and
> > > > most certainly would be copyrighted. It could be distributed free
of
> > > > charge in electronic form. Just the fact that we would be giving
it
> > > > away free would discourage competition.
> > > >
> > > > A separate list with url... well, it certainly could be done, but
how
> > > > big a monster is this going to become? Do we need a new list? Do
we
> > > > need a new server... possibly with a forum? Right now this is all
> new
>
> > > > and exciting... like the new girl in school... but the early
interest
> > > > may fade as the drudgery hits.
> > > >
> > > > A camel has been described as a horse designed by comittee... but
> then,
> > > > a camel is a pretty impressive piece of technology. Even though
God
> > > > likely did not consult a comittee upon finalizing the two or three
> > > > designs, the concept is still valid. I think that this would
> function
> > > > best if somebody would take charge and start assigning tasks as
soon
> as
> > > > possible.
> > > >
> > > > We perhaps need to compile a list of who is interested. We could
> easily
> > > > form our own mail list and take it off the psub list... but you
know
> > > > what? I suspect that even those not participating would find the
> > > > project of interest and it would be a simple matter to set filters
up
> to
> > > > shunt anything with "OSS" in the subject line to a specific
location.
> > > >
> > > > A wish list might be one of the first things to be enumerated...
just
> as
> > > > soon as we know who we are.
> > > >
> > > > This could work. For some reason I don't understand, there seems
to
> be
> > > > quite a bit of commeradery here... and little or no bickering.
> > > >
> > > > OK, enough from the landlubber. I've already put out my "wish
list"
> and
> > > > mentioned how I think I might be able to help. I'm going to sit
back
> > > > and watch until somebody tells me to go out and get an original
copy
> of
> > > > the plans for Trieste or something.
> > > >
> > > >
> > > >
> > > >
> > > > Dale A. Raby
> > > > Editor/Publisher
> > > > The Green Bay Web
> > > > http://www.thegreenbayweb.com
> > ><< dalesignature.gif >>
> > >
> > >--
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