Have you tried changing the sweep parameters? I had a little problem
with sink in the middle of a thick part. I changed the % blade gap and
sweep speed to correct it. Do these parts have any trapped volumes?
As I recall most of the acrylics pulled on the corners.
Jim
James P. Harrison e-mail: harrjp@juno.com
Director Of Operations Phone: 954-972-9906
3Dimensional Engineering Fax: 954-972-8903
2991 N. Powerline Rd. Web: www.3de.net
Pompano Beach, FL. 33069
On Fri, 7 Jan 2000 07:53:13 -0600 "Scott -Scooter- Sutterer"
<ssutter@pdmfg.com> writes:
> This also happens on the actua. I think it will happen on any
> material that
> has even a small shrink. Let me know if I am wrong. It seems the
> more
> shrink, the more warp. I remember SL5149 would actually pull the
> corners of
> the part off the supports.
> ----- Original Message -----
> From: "Luper, Harold" <HLuper@SOLIDIFORM.com>
> To: <rp-ml@bart.lpt.fi>
> Sent: Thursday, January 06, 2000 4:13 PM
> Subject: RE: Beefy SLA part warpage question.
>
>
> > I have had this problem building "beefy" ACES parts as well, with
> all
> three
> > machines and resins we've had over the years; an SLA 250 running
> 5170, SLA
> > 3500 running 5190, and our current machine, an SLA 5000 running
> 5195. I've
> > tried different orientations in the PCA (like face down with
> blocks under
> > the corners) to no avail. I haven't tried curing the part on the
> platform.
> >
> > I have even seen parts where there was less "curl" in the top of
> the part
> > than there was on the bottom (the part was actually thicker in the
> middle),
> > especially off of the SLA 250.
> >
> > Could this be caused by the effect of the resin being cured from
> the top
> for
> > every layer, and/or that the shrinkage occurring in each layer is
> cumulative
> > in the build? In other words, if layer #1 shrinks, then layer #2
> attaches
> > and shrinks, layer #3..... and so on, wouldn't that pull up the
> edges?
> >
> > Thanks,
> >
> > Harold Luper
> http://www.solidiform.com
> > Prototyping Specialist email:
> hluper@solidiform.com
> >
> > Solidiform Incorporated Phone: (817)-831-2626
> > 3928 Lawnwood Fax: (817)-831-8258
> > Fort Worth, Texas
> >
> >
> > -----Original Message-----
> > From: Bill Cannon-WM [mailto:cannon.wm@pg.com]
> > Sent: Thursday, January 06, 2000 3:14 PM
> > To: tbush@prototechengineering.com
> > Cc: rp-ml@bart.lpt.fi
> > Subject: Beefy SLA part warpage question.
> >
> >
> > I too have had this same problem. The diameter of my part was
> approximately
> > 16
> > inches and the thickness was roughly .75. The next time I built
> the part
> I
> > cured it with the platform, supports and all. This worked. I
> have an SLA
> > 5000
> > and use 7120 resin. Did I just get lucky the second time?
> >
> > Bill Cannon
> > ---------------------- Forwarded by Bill Cannon-WM/PGI on
> 01/06/2000 04:08
> > PM
> > ---------------------------
> >
> > Internet Mail Message
> > Received from host: bart.lpt.fi
> > [193.166.66.1]
> >
> >
> >
> > Envelope Sender: owner-rp-ml@bart.lpt.fi
> >
> > From: Tim Bush <tbush@prototechengineering.com> on 01/06/2000
> 03:13 PM
> >
> > To: rp-ml@bart.lpt.fi
> > cc: (bcc: Bill Cannon-WM/PGI)
> > Subject: Beefy SLA part warpage question.
> >
> >
> >
> >
> > Dear SLA Users,
> >
> > Recently, we built 14
> >
> > 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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