File puptcrit/puptcrit.0707, message 171


To: <puptcrit-AT-puptcrit.org>
Date: Wed, 18 Jul 2007 08:26:24 -0500
Subject: Re: [Puptcrit] TECH: Theory: rotomolding box


Mathieu.... we use a commercial rotocasting unit pretty much daily here. We
employ simple methods for attaching the molds.....

http://www.puppetsandprops.com/Images/RotocastingLg.jpg

http://www.puppetsandprops.com/Images/RotocastingMachineLg.jpg

http://www.puppetsandprops.com/Rotocasting.html

That works well for smaller molds that are light weight. We do something
similar for larger, heavier molds, but use banding straps as you can tighten
those a lot! The secret for us it having a good flange at the parting line
on the mold. 

http://www.puppetsandprops.com/Images/LeprechaunMold5.jpg

We have done this with plaster molds too, but it sounds like you may have a
good workable solution.

I actually made a home made unit, that spun on 2 different axis', before
buying the commercial rotocasting machine. What you are trying to do is much
simpler and won't require such an elaborate machine. Sounds like you are on
the right track!

Cheers,

Mike Brose
http://www.puppetsandprops.com



> -----Original Message-----
> From: puptcrit-bounces-AT-puptcrit.org [mailto:puptcrit-bounces-AT-puptcrit.org]
> On Behalf Of Mathieu René
> Sent: Tuesday, July 17, 2007 10:51 PM
> To: puptcrit-AT-puptcrit.org
> Subject: [Puptcrit] TECH: Theory: rotomolding box
> 
> I've just had a flash for a possible low-tech solutin to a semi-high-tech
> need.
> 
> When casting latex in plaster molds (slip casting), I usually have puddles
> of latex accumulating in places I'd rather not have them.
> It's hard to prevent it, I'd have to be there next to the mold and turn it
> every 3 minutes.
> 
> Some shops use a system that turns their mold constantly at slow speed.
> I've no idea how their machines work, I doT, know where to look for
> answers.
> 
> Unable to figure it out with the limited tools I have, I switched the
> problem around. I first wanted to find a way for a strong enough shaft to
> fit into each mold or grab them somehow with a claw-like attachement. Not
> easy to make it universal enough...
> 
> So then I had a flash about a box. If I made a strong wooden box, and
> fitted the bottom with the same fittings as the ones on grinding wheels
> for my bench grinder, I could perhaps attach the box steadily to the
> grinder. The mold would fit tightly in the box with polyfoam stuck between
> them. As for speed, I have a pedal I could use as a dimmer, and keep it at
> the desired speed with an elastic band.
> 
> 
> What do you think?
> 
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