We've been using the new roller scraper.
Drew Brown
Conceptual Reality L.L.C.
Phone:(248)926-8820
Fax:(248)926-8830
http://www.conceptual-reality.com
Miller, Michael W wrote:
> Excuse my ignorance but for these somos builds are people using the old
> metal scraper or the new (rubber) scraper?
> What does DTM recommend?
> Michael W Miller (Mike.Miller3@PSS.Boeing.com)
> The Boeing Company MS 17-PE B-XT62
> Propulsion Experimental Hardware 206-655-3289
> Rapid Prototyping 655-4366 Lab 655-4365
>
> > ----------
> > From: lphan@or1.plynex.com[SMTP:lphan@or1.plynex.com]
> > Sent: Thursday, May 14, 1998 12:08 PM
> > To: RPML
> > Subject: RE: SLS Somos problem
> >
> >
> > I have to agree with David Leigh. The problem is mainly due to the
> > roller bumping into the part. Changing the layer thickness somewhat
> > reduces the problem, but decreases part resolution. Currently, at
> > Plynetics Express we are building SLS Somos parts between .005"-.007"
> > layer thickness with a fairly good success rate. I believe the key to
> > prevent the roller diameter from increasing in size during the build
> > is to start out with a super clean roller and scrapper. Therefore,
> > during the machine preparation make sure to dress the roller and have
> > the scrapper sit "water-tight" (hint: you should not be able to see
> > between the scrapper and the roller) against the roller. This will
> > help cut down the powder from accumulating on the trailing side of
> > roller during build.
> > The bottom line, this is a roller issue and until the problem is
> > fixed, don't count on the build to come out every time.
> >
> >
> > Long Phan
> > Plynetics Express Corporation
> > Tel 503-531-2701
> > Direct 503-531-2707
> > Fax 503-629-6208
> > email: lphan@or1.plynex.com
> > www.plynex.com
> >
> >
> > ----------
> > From: harvest@ns.vvm.com[SMTP:harvest@ns.vvm.com]
> > Sent: Thursday, May 14, 1998 3:36 AM
> > To: RPML; dsbrown@conceptual-reality.com
> > Subject: Re: SLS Somos problem
> >
> > Somos Problem . . .
> >
> > The issue is that the roller is bumping the part . . . This is why
> > DTM recommends .008" layers. This doesn't do much for part
> > definition in a material that is not real good for definition to
> > begin with.
> >
> > So, why is it bumping??
> >
> > I have not noticed any curl in the parts, so the parts are not
> > "jumping" up in front of the roller. So, what could it be?? The
> > roller is hitting the part, not vice versa. The roller has not
> > changed and the powder is not sticking up out of the bed, so . . .
> > the powder is sticking to the roller. If you notice, the part starts
> > fine, but as static or adhesion starts, the build will crap out
> > because the effective roller diameter has increased and is now
> > interfering with your part.
> >
> > Building a base won't work because the part is not curling. Lower
> > laser power won't work, because the roller is the issue. So, fix
> > your roller issue, and you've fixed the problem. That's about all
> > the free advice you'll get from this here yocal.
> >
> > David Leigh
> > ****************************
> > Harvest Technologies
> > Rapid Prototyping Services
> > (254) 742-1822
> > harvest@harvest-tech.com
> >
> > For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
> >
> >
> > For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
> >
>
> For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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