Messages In This Digest (7 Messages)
- 1a.
- Re: Is roto-casting like a salad spinner? From: ihscoutfan@aol.com
- 1b.
- Re: Is roto-casting like a salad spinner? From: GoryCorey@MinionsWeb.com
- 1c.
- Re: Is roto-casting like a salad spinner? From: Tom or Gail Madden
- 2a.
- Where do I find Airfix material? From: John Willis
- 2b.
- Re: Where do I find Airfix material? From: Sculpt
- 2c.
- Re: Where do I find Airfix material? From: Balsanu Gabi
- 3a.
- Re: Newby help From: bearhedded
Messages
- 1a.
-
Re: Is roto-casting like a salad spinner?
Posted by: "ihscoutfan@aol.com" ihscoutfan@aol.com thedtandiguy
Thu Feb 21, 2008 10:57 am (PST)
hi group:
she is asking about spin casting. i guess the two words "spin" and "roto"
get mixed up quite a bit. roto casting rotates the mold in all directions for
a hollow casting. spin casting spins the molds in one direction forcing the
resin or metal into the cavities. i would guess that someone can explain the
two more in depth than i can.
i would like to say that pressure casting is safe as long as you know how it
works and respect the fact that it can go wrong if not done proper and can
cause injury. a poor made, low quality pot can fail. with all casting, whether
it be resin of metal, some aspects can be dangerous. the great thing about
this group is the talent and knowledge of several people who are wiling to
share their stories and know how and pass that along to others. there is no such
thing as a stupid question, we all start somewhere and make mistakes and
learn new ideas. sometimes not asking could lead to problems. passing them along
helps others, which is the strong point of the group.
randall
mrpiggss custom products
dayton, ohio
**************Ideas to please picky eaters. Watch video on AOL Living.
(http://living.aol.com/video/ how-to-please- your-picky- eater/rachel- campos-duffy/
2050827?NCID=aolcmp0030000000 2598)
[Non-text portions of this message have been removed]
- 1b.
-
Re: Is roto-casting like a salad spinner?
Posted by: "GoryCorey@MinionsWeb.com" csminion@minionsweb.com minionsweb
Thu Feb 21, 2008 11:21 am (PST)
Ahh, ok, a salad spinner for s spin caster, you may need to hack it but I
could see it as a viable method for small items, question is how do you
counter weight it to take out the self destructing wobble?
Ohhh speaking of pressure pots, just picked up a 10 gallon telfon coated
'stealth' (black) pressure pot for 19 bucks at the industrial supply last
weekend.
Whistle clean just no fittings or gasket (has all the clamps and in great
shape)
Also got a large gauge collection (they wouldn't split the lot)
I will have a number (3-6) of extra +/- pressure gauges -30 to 0 to +60psi I
think), and a few positive pressure gauges to offer up.
I will post about that when I get to piping the pressure pot
The plan is to dual duty the pot, pipe it for both pressure and vacuum (got
the gauges for it, right?)
I am considering building a yoke to pivot 90 degrees from standing to in its
side.
When standing it can degas in the mixing vessels, on the side pressure or
degas molds.
If I see another pot in as good a shape for a similar pricing, I will put
out word.
This industrial supply reseller gets pots pretty regularly in different
conditions.
Also picked up a Iwaki dual duty (positive/negative) pump (down to 29" pull)
for 50 bucks.
Not sure how fast it pulls down that far yet, need to google the specs.
_____
From: casting@yahoogroups.com [mailto:casting@yahoogroups.com ] On Behalf Of
ihscoutfan@aol.com
Sent: Thursday, February 21, 2008 1:57 PM
To: casting@yahoogroups.com
Subject: Re: [casting] Is roto-casting like a salad spinner?
hi group:
she is asking about spin casting. i guess the two words "spin" and "roto"
get mixed up quite a bit. roto casting rotates the mold in all directions
for
a hollow casting. spin casting spins the molds in one direction forcing the
resin or metal into the cavities. i would guess that someone can explain the
two more in depth than i can.
i would like to say that pressure casting is safe as long as you know how it
works and respect the fact that it can go wrong if not done proper and can
cause injury. a poor made, low quality pot can fail. with all casting,
whether
it be resin of metal, some aspects can be dangerous. the great thing about
this group is the talent and knowledge of several people who are wiling to
share their stories and know how and pass that along to others. there is no
such
thing as a stupid question, we all start somewhere and make mistakes and
learn new ideas. sometimes not asking could lead to problems. passing them
along
helps others, which is the strong point of the group.
randall
mrpiggss custom products
dayton, ohio
**************Ideas to please picky eaters. Watch video on AOL Living.
(http://living.
<http://living.aol.com/video/ how-to-please- your-picky- eater/rachel- campos-du
ffy/> aol.com/video/how-to-please- your-picky- eater/rachel- campos-duffy/
2050827?NCID=aolcmp0030000000 2598)
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
- 1c.
-
Re: Is roto-casting like a salad spinner?
Posted by: "Tom or Gail Madden" tgmadden@worldnet.att.net pullmanboss
Thu Feb 21, 2008 4:25 pm (PST)
> i would like to say that pressure casting is safe as long as you know
> how it works and respect the fact that it can go wrong if not done
> proper and can cause injury.
If you're going to do pressure casting, you'll likely have a tank-type air
compressor in the house. If you're comfortable with that being at 100 to 120
PSI, you should have no problem dealing with pressure pots running at 40 to
60 PSI with safety valves set slightly above those pressures. I have two
tanks in regular use - 2.5 and 5 gallon ones from McMaster-Carr - and run
them at 35 to 40 PSI. If you're unfamiliar with pressure casting, the
primary purpose is _not_ to force resin into all the nooks and crannies in
the mold, or to replace deairing the mix in vacuum, but to prevent reaction
product gasses from forming bubbles in the material as it heats up and
cures. It doesn't take much pressure to do that. Trapped air in the mold is
bad news, and your mold design, including gating, venting and fill angle,
should be such as to eliminate the possibility of trapping air. You have to
provide escape paths for the air as it's displaced by the incoming resin. If
you don't, it'll be trapped in the mold. Boyle's Law says that gas volume is
inversely proportional to pressure. Going from atmosphere to 60 PSI will
reduce the volume of a trapped bubble by a factor of four, but volume is
related to the cube of the radius, so the diameter of that bubble will still
be two thirds of what it was. That might be enough of a size reduction to
jar the bubble loose so it moves somewhere else, but not enough to make it
disappear. If it floats up to an unimportant surface, fine. If it's in an
unvented, inverted cavity, not fine.
For what it's worth, I have my tanks mounted in saddles, lying on their
sides. All my larger molds sit on bases cut from laminated shelving, and I
just slide them into the tanks on their bases. For smaller molds, I have a
shelf cut from the same laminate to fit each tank. (A "large" mold, for me,
would be two parts, 12" x 6" x 3" when assembled.)
Tom Madden
- 2a.
-
Where do I find Airfix material?
Posted by: "John Willis" willisjc@zebra.net willisjcus
Thu Feb 21, 2008 3:35 pm (PST)
http://www.sculpt.com/catalog_ 98/CastingMateri als/URETHANES/ flexurethane. htm
<http://www.sculpt.com/catalog_ >98/CastingMateri als/URETHANES/ flexurethane. htm
The link works for netscape and explorer on my computer.
John C.Willis
Mobile, A
USA
[Non-text portions of this message have been removed]
- 2b.
-
Re: Where do I find Airfix material?
Posted by: "Sculpt" TCS@sculpt.com compleatsculptor
Thu Feb 21, 2008 3:56 pm (PST)
John, thanks for checking! It should work in all browsers.
John Willis wrote:
>
> http://www.sculpt.com/catalog_ 98/CastingMateri als/URETHANES/ flexurethane. htm
> <http://www.sculpt.com/catalog_ >98/CastingMateri als/URETHANES/ flexurethane. htm
>
> <http://www.sculpt.com/catalog_ 98/CastingMateri als/URETHANES/ flexurethane. htm
> <http://www.sculpt.com/catalog_ >>98/CastingMateri als/URETHANES/ flexurethane. htm
> The link works for netscape and explorer on my computer.
> John C.Willis
> Mobile, A
> USA
>
> [Non-text portions of this message have been removed]
>
>
--
Marc Fields
The Compleat Sculptor, Inc.
"You Supply the Talent, We'll Supply the Rest."
212-367-7561 www.sculpt.com
CONFIDENTIALITY NOTICE:
This e-mail is confidential and privileged. If you have received it in error, please notify us immediately by reply e-mail and then delete this message from your system. Please do not copy it or disclose its contents to any other person. Thank you for your cooperation.
- 2c.
-
Re: Where do I find Airfix material?
Posted by: "Balsanu Gabi" gabi.balsanu@rdslink.ro balsanu_gabi
Thu Feb 21, 2008 11:39 pm (PST)
Thank you for posting that links. I don't know what happening but I can't access any of those. It is my comp, my ISP or you're ISP, who knows. I give up. Maybe from another country that links will work.
Later
GB
----- Original Message -----
From: John Willis
To: casting@yahoogroups.com
Sent: Thursday, February 21, 2008 8:54 PM
Subject: [casting] Where do I find Airfix material?
http://www.sculpt.com/catalog_ 98/CastingMateri als/URETHANES/ flexurethane. htm
<http://www.sculpt.com/catalog_ >98/CastingMateri als/URETHANES/ flexurethane. htm
The link works for netscape and explorer on my computer.
John C.Willis
Mobile, A
USA
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
- 3a.
-
Re: Newby help
Posted by: "bearhedded" bearhedded@hotmail.com bearhedded
Thu Feb 21, 2008 10:24 pm (PST)
Commercial acrylic stones (and buttons and faux pearls) can be dyed with Rit...just don't
get them too hot. Simmering for a longer period of time is better than trying to hurry
them in boiling water. There will be a haze that you'll need to buff off, when you get them
to the color you want.
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