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/
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