[PSUBS-MAILIST] CAD for presentation

Fri May 27 11:06:19 EDT 2016

I concur with Cliff. Both Solidworks and Autodesk Inventor are functionally equivalent packages (with Solidworks probably edging out a lead in proliferation and FEA / CFD transference), and it would serve you well to learn both modelling and engineering drawing creation with one of these packages. They are expensive tools, but you don't necessarily need a maintenance subscription. Year to year, the changes are mostly aesthetic / interface. Core functionality is what matters. Fixing an interference in 3D space is much cheaper than fixing it after you have fabricated parts, and if you farm out fabrication / machining of anything, the drawing serves as your contract - the supplied part has to match, and no worries about misinterpretations.

That said, right off the bat you won't be able to create appropriate geometry for FEA models, other than relatively simple solid models, because FEA has to consider contact interfaces between parts which are not physically joined, flexible elements, and so on. Setting up properly representative FE load cases requires some experience, to take advantage of appropriate symmetries, determine mesh refinements and so on. I have used the FEA applets that are part of the CAD packages, as well as a bit of Abaqus and LS-Dyna, but only sporadically over the years. I will do my own FEA on single parts with simple load cases, but when things get more complicated, I hand them off to colleagues with more experience in that area.

A parametric 3D solid modeling package and some training are probably good investments.  That said, if you need something in a hurry, I may be able to help you out. Contact me off list.

Sean

On May 27, 2016 7:52:31 AM MDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Scott, I have been thinking about your request for CAD assistance for
>upcoming presentation.  I think with your Pisces VI build, you really
>have
>both tactical and strategic technical drawing needs.  Let look at the
>long
>range strategic need first.  Because you are going to make some changes
>to
>the boat, ABS is going to make you submit a report that among other
>things
>has a drawings set that reflects the current build, a weights and
>balance
>and buoyant accounting that rolls up the new CG and CB of the boat and
>a
>stress analysis of the pressure hull both in the form of the ABS hull
>stress calculations and an FEA.    The best way to get these is through
>a
>3-D modeling package like Autodesk Inventor Pro or Solidworks.  My
>suggestion is to invest in one of the software packages and take a
>basic
>3-D modeling training course on the software.  You then crawl into the
>belly of the beast with your tape measure and digital caliper and take
>the
>dimensions of each part and then model it in the 3-D modeling software.
>After you get all the parts modeled, you them make up assemblies of
>these
>parts that will enable you to turn out the 2-D prints of the parts and
>assemblies.   From this 3-D model, of your Pisces VI, you then can
>extract
>the CB, CG of the boat.  All of these 3-D software packages let you
>export
>STEP files of the model that can be read by the FEA software Sean uses.
> If
>you pay some one to build this 3-D model, first of all it will cost a
>lot
>of money and every time you change anything you will have to go back
>the
>guy for an update.  In the long run, having this skill set (3-D
>modeling)
>will be very useful for future mechanical projects off all types.
>
>From a tactical perspective, what people are most interested in, from
>my
>perspective, on your renovation is what is the state of the boat at the
>time you acquired it documented by lots of pictures, and what the big
>pictures is on what you think you will need to do to get your ABS
>A1 recertification and lastly what are the major structural changes you
>are
>planning.  I don't know how much time you have for your presentation
>but my
>guess is 20 minutes or so.  If this is the case, on average you can
>count
>on about 1 min per slide so you have 20 slides to present.  This does
>not
>leave much time for presenting CAD work.  You might be able to get away
>with the basic drawing tools in Power point for these few slides on the
>changes.
>
>Make sure you put a slide in for your new mega shop which we are all
>salivating over and how you are going to dive this boat when your done
>in
>Kansas!
>
>Cliff
>
>On Thu, May 26, 2016 at 10:41 AM, via Personal_Submersibles <
>personal_submersibles at psubs.org> wrote:
>
>> OK. Thanks for the information
>>
>> Scott Waters
>>
>> >  -------Original Message-------
>> >  From: Brian Cox via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> >  To: Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> >  Subject: Re: [PSUBS-MAILIST] CAD for presentation
>> >  Sent: May 26 '16 10:30
>> >
>> >  Yeah, but it's very intuitive once you get into it.  Plus you
>could
>> generate data to make parts using a CNC.  More computer power = good
>thing !
>> >
>> >  Brian
>> >
>> >  --- personal_submersibles at psubs.org wrote:
>> >
>> >  From: via Personal_Submersibles <personal_submersibles at psubs.org>
>> >  To: Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> >  Subject: Re: [PSUBS-MAILIST] CAD for presentation
>> >  Date: Thu, 26 May 2016 09:30:35 -0500
>> >
>> >  I am worried about the amount of time it would take me to learn to
>be
>> good with the software. From my understanding, it is quite the ramp
>up time.
>> >
>> >  Thank you,
>> >  Scott Waters
>> >
>> >  >  -------Original Message-------
>> >  >  From: Brian Cox via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> >  >  To: Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> >  >  Subject: Re: [PSUBS-MAILIST] CAD for presentation
>> >  >  Sent: May 25 '16 19:09
>> >  >
>> >  >  Scott,   You might want to think about getting set up with
>"machine
>> works" it's a type of cad program that integrates into CNC and also
>has
>> some FEA capability ( very advanced stuff) .  But you would need some
>> serious computer power to run the program.  But then designed
>components
>> could then be coded for machining, it has extensive modeling etc.. , 
>state
>> of the art stuff.   -  Brian
>> >  >
>> >  >  --- personal_submersibles at psubs.org wrote:
>> >  >
>> >  >  From: via Personal_Submersibles
><personal_submersibles at psubs.org>
>> >  >  To: PSUBS <personal_submersibles at psubs.org>
>> >  >  Subject: [PSUBS-MAILIST] CAD for presentation
>> >  >  Date: Wed, 25 May 2016 15:06:13 -0500
>> >  >
>> >  >  I was wondering if anyone could help me out. I am planning on
>doing
>> a presentation at Underwater Intervention about the Pisces VI
>submarine. I
>> am wanting to show the components of the submarine how the sub
>originally
>> was and then how we are changing it. I am not trained in CAD and was
>> wondering if there is someone out there that could easily do this?
>> >  >
>> >  >  Thank you,
>> >  >  Scott Waters
>> >  >  _______________________________________________
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>> >  >  Personal_Submersibles at psubs.org
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>> >  >
>> >  >
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>> >
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>
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