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Re: [PSUBS-MAILIST] Acrylic Molds
Hi Mark,
I recieved the corrosion document that you sent. Thanks alot. I'll be scanning
it providing somehow to the group as soon as I can.
JP
Quoting Mark Steed <plutomark@mail.astate.edu>:
>
> Jeff: I am in total agreement and for my part, the discussion can stay
> on-line. I'll leave the final call with Doc. If he is game, I sure am. I
> would love to be able to form some acrylic domes that are actually
> useful instead of the small experimental ones I have tried (and ruined).
> I have a tremendous amount to learn about the subject and with Doc's
> expertise, and the rest of this multi-talented group, no telling what
> can develop. Hey, did you get the corrosion paper OK? Marco got his in
> New Zealand. Best regards, Mark
>
> ---------- Original Message ----------------------------------
> From: JP <jeffpost@rawbw.com>
> Reply-To: personal_submersibles@psubs.org
> Date: Tue, 7 Jan 2003 18:13:55 -0800
>
> >Mark & Doc
> >
> >I for one would like to see this discussion stay "on-line". This is the
> kind
> >of chatter I want to hear; not this nuclear homebuilt bullshit. I think
> I've
> >deleted two hundred messages in the last three days from this list that
> were
> >complete nonsense.
> >
> >JP
> >
> >On Monday 06 January 2003 07:51 pm, Doc wrote:
> >
> >> Hey Mark,
> >>
> >> If you blow or droop the part, you will have some thickness variation
> in
> >> the finished part. For uniformity Drape molding over a felt covered
> male
> >> mold is best. The size and thickness you're talking can easily be
> heated in
> >> the oven. You can contact me off list and I'll try to walk you
> through it.
> >> There are no dumb questions,,, dumb answers, that's another story.
> >>
> >>
> >> Doc
> >>
> >> Mark Steed wrote:
> >> > Doc: Wonderful! You are the man and thanks for getting back with
> me. I
> >> > have done some small forming but nothing close to what you have. I
> am
> >> > very interested in these techniques, especially the forming oven.
> Could
> >> > you elaborate sometime on the oven's construction, time and
> temperature,
> >> > etc ? What I would really like to do is make up a round port 6 to
> 8
> >> > inches across and 1 to 2 inches deep. All this is approximate. I do
> have
> >> > some 3/8 inch thick stock. Is this workable? Thanks Doc. If you
> want me
> >> > to conatct you off-list or whatever, I appreciate it. What I don't
> know
> >> > about this sort of thing would fill a warehouse so don't be
> surprised at
> >> > some dumb questions. Many thanks again and best regards, Mark
> >> >
> >> > ---------- Original Message ----------------------------------
> >> > From: Doc <doc@bionicdolphin.com>
> >> > Reply-To: personal_submersibles@psubs.org
> >> > Date: Mon, 06 Jan 2003 18:37:02 -0800
> >> >
> >> > >Mark;
> >> > > I've done considerable research and testing on different ways to
> form
> >> > > acrylic in the barn, from gravity to blow molding to drape
> forming of
> >> > > up to 1 inch thick over a male fiberglass mold. For blow molding
> or
> >> > > gravity forming, you can coat your separation points (ring) with
> a
> >> > > layer of epoxy resin or gelcoat and a thin coat of car wax. You
> can
> >> > > build a 4'X8' forming oven out of plywood or chip board, aluminum
> foil
> >> > > , a piece of 1/4" plate glass and a propane barbecue!
> >> > >
> >> > >Doc
> >> > >
> >> > >Mark Steed wrote:
> >> > >> Carsten: Somewhere in all my papers, I have some factory
> (Dupont)
> >> > >> technical reports on acrylic forming. For the life of me, I
> cannot
> >> > >> find them now-but I will. In the meantime, I remember one method
> they
> >> > >> reported on and it was to utilize steel rings instead of plywood
> in
> >> > >> the mold construction. These steel rings were to be coated in a
> high
> >> > >> temp. petroleum based grease to keep the acrylic from sticking.
> The
> >> > >> assembly was inverted in an oven, heated and then gravity was
> allowed
> >> > >> to form the sphere. There was no provision for an air line for
> >> > >> "blowing". I have a few large pieces of 3/8 inch thick acrylic
> sheets
> >> > >> that I would like to try this on but hate to waste any of it.
> Are you
> >> > >> familiar with anything like this? Any suggestions appreciated
> from
> >> > >> everyone. I toured the Euronaut again today on the website.
> Damn,what
> >> > >> an accomplishment,Herr Kapitan! Mark Steed
> >> > >>
> >> > >> ---------- Original Message ----------------------------------
> >> > >> From: MerlinSub@t-online.de (Carsten Standfuss)
> >> > >> Reply-To: personal_submersibles@psubs.org
> >> > >> Date: Mon, 06 Jan 2003 22:35:58 +0100
> >> > >>
> >> > >> >Michael B Holt schrieb:
> >> > >> >> On Mon, 06 Jan 2003 20:53:47 +0100 Carsten Standfuss
> writes:
> >> > >> >> >> Was the plywood being used as a mold; that is, was the
> acrylic
> >> > >> >> >> being formed against the plywood?
> >> > >> >> >
> >> > >> >> > _ _ plywood ring
> >> > >> >> > ---------- acrylic sheet
> >> > >> >> > - === plywood ring with air vale
> >> > >> >> > ---------- plywood plate
> >> > >> >>
> >> > >> >> That's the same method in the Markham plans. How well did
> >> > >> >> it work?
> >> > >> >
> >> > >> >It doesn't work well.. I put the unit out the oven during the
> time I
> >> > >> > saw that the acrlic sunk in the middle - short before it
> contact
> >> > >> > with his centerpoint the baseplate. Then I connected air wire
> from a
> >> > >> > airpump (a small electric 18 atmosph. compressor) to the vale
> and
> >> > >> > blow the bubble.. ..but lost to much air via the plywood - so
> the
> >> > >> > bubble make just some 20° degree and not the 180° I want.
> >> > >> >Also I found that the plywood isolate the acrylic in the rand
> areas
> >> > >> >to much from the heat .. next time I prefer to test a mold
> with
> >> > >> >aluminium rings and plates..
> >> > >> >The acrylic was about a half inch strong - and the plywood
> maybe not
> >> > >> > the best..
> >> > >> >
> >> > >> >How much will the pine planks cost ?
> >> > >> >And how much the overall project ?
> >> > >> >How much hours you will spend ?
> >> > >> >Have you think about after using the sub - to
> >> > >> >spent it for museums porpose ?
> >> > >> >
> >> > >> >The "..naut" in Euronaut is also a contribution to S.Lake..
> >> > >> >
> >> > >> >regards Carsten WWW.euronaut.org
> >
> >
>
>
>
>
Jeff Post
Everything can be inherited except sterility.