From: Kiran Shastry (kiranshastry251@yahoo.co.in)
Date: Mon Nov 24 2003 - 17:44:30 EET
Dear Anuj,
Please explain your vague reply. How many years yu
worked with your machine ?
Kiran.
--- "apshah@bom3" <apshah@bom3.vsnl.net.in> wrote: >
We have tried various model with totally enclosed
> bubble and have got
> successful RPT model on the Perfactory Mini RPT
> machine by Envisiontec GmbH.
> The concept behind no liquid resin being enclosed in
> the block is that in
> the perfactory RPT machines, the models are created
> upside down, thus due to
> gravity the resin never gets trapped during the
> built and what we get is a
> hollow built as required. As correctly noted by
> Larry, your problem seems to
> in the modeling software.
>
> Anuj Shah
> Director
> Sarto Electro Equipments Pvt. Ltd.
> 512 - Parekh Mansion,
> S.V.P. Road,
> Opera House,
> Mumbai - 400 004.
> tel - 0091-22-23823077
> fax - 0091-22-23879457
> email - apshah@bom3.vsnl.net.in
>
> >
> >
> > At 04:33 AM 11/14/2003, you wrote:
> > >Jonathan,
> > >
> > >Yes, you can build a cube of Swiss cheese with an
> SLA machine. The
> totally
> > >enclosed "Bubbles" within the block would build
> as a enclosed volume of
> > >liquid resin.
> > >
> > >I believe the problem you are experiencing stems
> from your modeling
> software
> > >not the RP method.
> > >
> > >When you attempt to model a theoretical construct
> that contains only a
> > >single twisted surface, you are creating the
> problem. Single surface
> objects
> > >don't exist in nature unless they are a solid
> shape like a sphere. Even a
> > >soap bubble has a thickness, and therefore has an
> inside and an outside
> > >surface.
> > >
> > >If the twisted surface that you are attempting to
> create wraps back onto
> > >itself, most solid modeling software, by default,
> will assume the trapped
> > >volume is a solid.
> > >
> > >When exporting the data for RP, the CAD modeler
> will follow the rules of
> STL
> > >file generation and export the STL surface data
> as a set of triangles,
> each
> > >with a single normal facing in only one
> direction.
> > >
> > >See if you can create your surface with a
> thickness of some small amount.
> > >The modeler can then export the STL data as a
> pair of surfaces "back to
> > >back" and may let you build the object as you
> envision it.
> > >
> > >Sincerely,
> > >
> > >Larry Blasch
> > >Design Engineer
> > >CAE Systems Administrator
> > >
> > >OPW Fueling Components
> > >P.O. Box 405003
> > >Cincinnati, OH 45240-5003 USA
> > >Voice: (513) 870-3356
> > >Fax: (513) 870-3275
> > >
> > >
> > >-----Original Message-----
> > >From: Jonathan Chertok
> [mailto:chertok22@hotmail.com]
> > >Sent: Thursday, November 13, 2003 11:35 AM
> > >To: rp-ml@rapid.lpt.fi
> > >Subject: RE: Void Normal Direction
> > >
> > >
> > >List,
> > >
> > >After a little thought on the responses to this
> question I am wondering
> the
> > >following:
> > >
> > >Could you build essentially a cube of swiss
> cheese using SLA RP for
> > >instance?
> > >
> > >I understand that there is an issue with the fact
> that the voids should
> have
> > >
> > >no draft type angles in the downward build
> direction that would trap
> > >material.
> > >
> > >But would you need to put tiny holes through all
> the voids in the
> "cheese"
> > >in order to get it to build?
> > >
> > >I'm curious about this,
> > >
> > >Jonathan
> > >
> > >
> > >
> > >Universal Joint: Buildings + Digital Design
> > >
> > >Jonathan Chertok. Principal
> > >Austin, Texas [512] 407 9628
> > >
> > >Full Service Design and Construction
> > >
> >
>
>_________________________________________________________________
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> > Dr. Ian Gibson
> >
> > Currently on study leave at
> > National University of Singapore,
> > Dept. Mechanical Engineering
> > 9 Engineering Drive 1
> > Singapore 117576
> > Tel: +65 6874 1917
> > Mob: +65 9087 3512
> >
> > "Everything really is stupidly simple, and yet all
> around is utter
> confusion,
> > don't look around to find the sound that's right
> beneath your feet"
> >
> >
>
>
>
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