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[casting] Digest Number 3408

Messages In This Digest (11 Messages)

1a.
Re: Small prototype piece help please From: Mike Brose
2a.
Re: I need some shrinkage! From: Don Hamilton
2b.
Re: I need some shrinkage! From: Clark Cone
2c.
Re: I need some shrinkage! From: Tom or Gail Madden
2d.
Re: I need some shrinkage! From: Don Hamilton
2e.
Re: I need some shrinkage! From: Jim Rogers
2f.
Re: I need some shrinkage! From: Steven Guevara
2g.
I need some shrinkage! From: John Willis
2h.
Re: I need some shrinkage! From: Nozmo King
3a.
What I need shrunk? From: barry@railrec.com
3b.
Re: What I need shrunk? From: Jim Rogers

Messages

1a.

Re: Small prototype piece help please

Posted by: "Mike Brose" Mike@puppetsandprops.com   puppetsnprops

Thu Feb 14, 2008 8:33 am (PST)

Amy..... I don't know off hand where to find a thinner wall version, but
I'm sure they exist. I'm not sure this link will come through in tact.....

http://www.coleparmer.com/catalog/product_index.asp?cls=6749&gcid=s18582x048&keyword=rubber+tubing&wt.srch=1

....but there's lots of tubing styles listed there. The problem is
finding a place where you can buy it in small quantities. A quick
search on Google will turn up a number of such sources. Some diligence
in searching might turn something up ready made that will work.

Cheers,

Mike Brose
http://www.puppetsandprops.com

iwillinvent wrote:
> Dear Mr. Brose:
>
> I have tried the silicone fuel tubing. I like the idea, but the walls of the tubing are too
> thick. I bought some at a hobby store in Hopkins.
>
> Might it be available in a thinner-wall version?
>
> Regards,
>
> Amy
>
>

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Messages in this topic (8)
2a.

Re: I need some shrinkage!

Posted by: "Don Hamilton" donvalley@sympatico.ca   dvgraphicsca

Thu Feb 14, 2008 8:42 am (PST)

> ><mailto:barry%40railrec.com>barry@... wrote:
> > >
> > > Hi All,
> > > I have some boxcars to make and I need to shrink them about 6% to
> > > get them to the proper size. Can someone suggest a resin, RTV, or
> > > something else to shrink these parts.
> > > Thanks Barry
> Buy my junk! http://www3.sympatico.ca/doc/robotone/for-sale.html

-------------------------------------------------
Wow! 6%
I am not at your level of expertise but I do a little casting in
Urethane and also use Smooth-on products from Sculpture Supply in
Toronto.

This week I built a master, created a mold (OOMOO30)and cast parts in
Colorcast 326 tinted black. The parts, 7.5" long flat ON30 passenger
car sides, are actually about 0.020" longer than the master not shorter.
I don't have access to pressure or vacuum tools.

I expected a little shrinkage in the plastic but it expanded a bit, I
am confused and hesitant to move up to a more ambitious project that
will require parts cast separately to fit together. Is this weeks
experience a fluke or can I expect the combination of materials I have
chosen to behave consistently.

I wish I could help with your problem and am only replying because I
don't want to have the same problem pop up here if I can avoid it.

Don Hamilton
http://www.on30.ca


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Messages in this topic (12)
2b.

Re: I need some shrinkage!

Posted by: "Clark Cone" archive.clark@gmail.com   clark_cone

Thu Feb 14, 2008 9:13 am (PST)

Don, I'm an amateur caster, too, but I have never had a cast part expand...
I would contact Smooth-On and find out if this is a characteristic of the
product you used... please report back your findings if you do, eh? Thanks,
Clark Cone

On 2/14/08, Don Hamilton <donvalley@sympatico.ca> wrote:
>
> > ><mailto:barry%40railrec.com>barry@... wrote:
> > > >
> > > > Hi All,
> > > > I have some boxcars to make and I need to shrink them about 6% to
> > > > get them to the proper size. Can someone suggest a resin, RTV, or
> > > > something else to shrink these parts.
> > > > Thanks Barry
> > Buy my junk! http://www3.sympatico.ca/doc/robotone/for-sale.html
>
> -------------------------------------------------
> Wow! 6%
> I am not at your level of expertise but I do a little casting in
> Urethane and also use Smooth-on products from Sculpture Supply in
> Toronto.
>
> This week I built a master, created a mold (OOMOO30)and cast parts in
> Colorcast 326 tinted black. The parts, 7.5" long flat ON30 passenger
> car sides, are actually about 0.020" longer than the master not shorter.
> I don't have access to pressure or vacuum tools.
>
> I expected a little shrinkage in the plastic but it expanded a bit, I
> am confused and hesitant to move up to a more ambitious project that
> will require parts cast separately to fit together. Is this weeks
> experience a fluke or can I expect the combination of materials I have
> chosen to behave consistently.
>
> I wish I could help with your problem and am only replying because I
> don't want to have the same problem pop up here if I can avoid it.
>
> Don Hamilton
> http://www.on30.ca
>
>
>
>

[Non-text portions of this message have been removed]

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Messages in this topic (12)
2c.

Re: I need some shrinkage!

Posted by: "Tom or Gail Madden" tgmadden@worldnet.att.net   pullmanboss

Thu Feb 14, 2008 11:40 am (PST)

> This week I built a master, created a mold (OOMOO30) and cast parts
> in Colorcast 326 tinted black. The parts, 7.5" long flat ON30 passenger
> car sides, are actually about 0.020" longer than the master not shorter.
> I don't have access to pressure or vacuum tools.

Did you make and use your mold at the same temperature? Silicone rubber has
a significant coeffecient of expansion, about 4X that of cured rigid
urethanes IIRC, so if you poured your casting into a mold that was 7 to 10
degrees warmer than it was when it was made, you'll more than compensate for
the intrinsic shrinkage in your mold - resin pairing.

Tom Madden

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Messages in this topic (12)
2d.

Re: I need some shrinkage!

Posted by: "Don Hamilton" donvalley@sympatico.ca   dvgraphicsca

Thu Feb 14, 2008 12:55 pm (PST)

--- In casting@yahoogroups.com, "Tom or Gail Madden" <tgmadden@...>
wrote:
>
> > This week I built a master, created a mold (OOMOO30) and cast
parts
> > in Colorcast 326 tinted black. The parts, 7.5" long flat ON30
passenger
> > car sides, are actually about 0.020" longer than the master not
shorter.
> > I don't have access to pressure or vacuum tools.
>
> Did you make and use your mold at the same temperature? Silicone
rubber has
> a significant coeffecient of expansion, about 4X that of cured
rigid
> urethanes IIRC, so if you poured your casting into a mold that was
7 to 10
> degrees warmer than it was when it was made, you'll more than
compensate for
> the intrinsic shrinkage in your mold - resin pairing.
>
> Tom Madden
>
----------------------------------------------------------

Tom,
The mold and the castings were made in the furnace area of my
basement which is probably the most stable room temperaturewise in
the house, about 70 F. I just placed the mold back into the box in
which it was created, it fit perfectly inside the box borders and
over the master which leads me to believe that there was no expansion
or shrinkage during its production. The mold is several days old and
has been used to make 6 castings.

I am not complaining, just curious if this progression of events can
be expected to be duplicated in future projects.

Thanks for your input.
Don Hamilton

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Messages in this topic (12)
2e.

Re: I need some shrinkage!

Posted by: "Jim Rogers" jr@jamesrogersstudio.com   jrstudioboss

Thu Feb 14, 2008 1:20 pm (PST)

http://industrialpolymers.com/ hydrospan 400 is their shrinking material,
but you'd have to ask them if there's enough water there to catalyze it.
Also, 6% in length is not 6% in volume, and you've got to figure out your
water by volume.

Jim

James Rogers Sculpture Studio
10405 San Sevaine Way, Suite A
Mira Loma, CA 91752
951-360-9933 tel
www.jamesrogersstudio.com




-----Original Message-----
From: casting@yahoogroups.com [mailto:casting@yahoogroups.com] On Behalf Of
barry@railrec.com
Sent: Wednesday, February 13, 2008 1:40 PM
To: casting@yahoogroups.com
Subject: [casting] I need some shrinkage!

Hi All,
I have some boxcars to make and I need to shrink them about 6% to get
them to the proper size. Can someone suggest a resin, RTV, or something else
to shrink these parts.
Thanks Barry

----------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.

Yahoo! Groups Links

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Messages in this topic (12)
2f.

Re: I need some shrinkage!

Posted by: "Steven Guevara" a3dcreator@gmail.com   stevalucho

Thu Feb 14, 2008 3:43 pm (PST)

I can suggest one thing.
you can 3dscan them for about 300.00
and then have them scaled down to the size you want.
as a matter of fact after you have a digital file of your sculpture you
continuosly shrink or enlarge them to the size that you want.
and then you spit the file back out through the 3d printer.
the price depebds on the size

On Wed, Feb 13, 2008 at 1:40 PM, <barry@railrec.com> wrote:

> Hi All,
> I have some boxcars to make and I need to shrink them about 6% to
> get them to the proper size. Can someone suggest a resin, RTV, or
> something else to shrink these parts.
> Thanks Barry
>
> ----------------------------------------------------------
> This message was sent using IMP, the Internet Messaging Program.
>
>
>

[Non-text portions of this message have been removed]

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Messages in this topic (12)
2g.

I need some shrinkage!

Posted by: "John Willis" willisjc@zebra.net   willisjcus

Thu Feb 14, 2008 4:29 pm (PST)

Why don't you just make masters the size you need?
John C. Willis
Mobile, Al

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Messages in this topic (12)
2h.

Re: I need some shrinkage!

Posted by: "Nozmo King" gnome9us@yahoo.com   gnome9us

Thu Feb 14, 2008 8:43 pm (PST)

Barry,

Give this a try, Industrial Polymers Corp. You want to contact them and ask for "Hydrospan 400"., as it is NOT listed on the web site. www.industrialpolymers.com They do have a product used for expanding items also and it is "Hydrospan 100". which you will find listed under "Expanding Urethanes". Why they list one and not the other.. your gues is as good as mine.

Hope you find this useful,
Jeff K.


barry@railrec.com wrote:
Hi All,
I have some boxcars to make and I need to shrink them about 6% to
get them to the proper size. Can someone suggest a resin, RTV, or
something else to shrink these parts.
Thanks Barry

----------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.

www.pamaplefestival.com

---------------------------------
Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now.

[Non-text portions of this message have been removed]

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Messages in this topic (12)
3a.

What I need shrunk?

Posted by: "barry@railrec.com" barry@railrec.com   locoartist42

Thu Feb 14, 2008 5:06 pm (PST)

Hi All,
Description of the item to be shrunk. A one piece boxcar body the
frame fits up in the bottom of the body. There are also numerous
detail parts. The body is from .040 thick to .080, It is designed so
areas of the body can be cut out and replaced with open doors.
Thanks Barry

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This message was sent using IMP, the Internet Messaging Program.

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Messages in this topic (2)
3b.

Re: What I need shrunk?

Posted by: "Jim Rogers" jr@jamesrogersstudio.com   jrstudioboss

Fri Feb 15, 2008 7:10 am (PST)

Barry, we use the Hydrospan a bit, and though it works great, it is VERY
flexible, and when working with mechanical and architectural items, keeping
straight and flat things straight and flat is a chore. Another thing with
the Hydrospan is that its working time is about the shortest of anything
I've ever used, so bubbles could be a major issue. You are probably going to
have to modify or rebuild your master; we just finished a Wall-E (new Pixar
character) sculpt that ended up being 15% too big, and had to resculpt most
of it, we were able to use the Hydrospan for the caterpillar track part, but
there were some places we had to fix because of shrink warpage. Bad cheese
mate; it'll give you another nice master to sit on the shelf though!

jr

James Rogers Sculpture Studio
10405 San Sevaine Way, Suite A
Mira Loma, CA 91752
951-360-9933 tel

www.jamesrogersstudio.com




-----Original Message-----
From: casting@yahoogroups.com [mailto:casting@yahoogroups.com] On Behalf Of
barry@railrec.com
Sent: Thursday, February 14, 2008 5:07 PM
To: casting@yahoogroups.com
Subject: [casting] What I need shrunk?

Hi All,
Description of the item to be shrunk. A one piece boxcar body the frame
fits up in the bottom of the body. There are also numerous detail parts. The
body is from .040 thick to .080, It is designed so areas of the body can be
cut out and replaced with open doors.
Thanks Barry

----------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.

Yahoo! Groups Links

__________ NOD32 2878 (20080215) Information __________

This message was checked by NOD32 antivirus system.
http://www.eset.com

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Messages in this topic (2)
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