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Re: [PSUBS-MAILIST] DXF Files
Don't forget, though, that a project like this could benefit in this way:
You can have different people develop different areas and then all the
pieces can bit trial fit together and mods made before metal is cut.
Warren.
>
> 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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