I think the new scanning order (border all parts then hatch all parts) is
written to optimize the SLA7000. The SLA7000 has 2 beam spot sizes, 0.010
and 0.030 inch diameter laser spots, which is accomplished by mechanically
moving an optical lens in the beam path to focus and defocus the beam
diameter. The small spot size is used to border and the large beam size is
used to hatch and fill (actually both sizes are used to hatch and fill
depending on the build profile).
To mechanically focus and defocus the beam for each part would be a huge
time penalty (15 second delay for switching spot sizes) per layer. So, I
understand why the current scanning sequence is used on the 7000.
I have to wonder why all the rest of the users (with single beam diameters)
have to put up with the same.
So, Harold and Stacie, I hope you can be counted on to bring this issue (and
possible solutions) to the 3DSNASUG Wish list session!
Steve Deak 2000 3DSNASUG Chairperson
Mgr.-Rapid Prototyping e-mail: sdeak@hasbro.com
Hasbro, Inc. voice: (+1) 513-579-3270
615 Elsinore Place fax: (+1) 513-579-3250
Cincinnati, OH 45202 USA Making The World Smile TM
-----Original Message-----
From: Luper, Harold [mailto:HLuper@SOLIDIFORM.com]
Sent: Thursday, December 16, 1999 8:59 AM
To: RPML (E-mail)
Subject: RE: LightYear software
I have noticed this since early on in the beta program with Lightyear and
the new Buildstation software. I don't know if this is a Lightyear issue or
if it is something new incorporated in the Buildstation software. I can
understand the rationale in doing this in that the affected characteristics
in the process are more evenly distributed across the platform in each layer
of the build. However, one problem I've had is that this feature has been a
huge disadvantage to me in cutting pre-dip delay and level wait times in
builds where differing geometries in a single build allowed me to sequence
the scanning order in such a way to allow additional time for a specific
part by scanning another part first or last. I think it would be better to
have an option, or "switch", to select the type of scanning order that will
be used in a given build.
Have you had this, or other problems with it?
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: Stacie Van Dorin [mailto:svandorin@solidconcepts.com]
Sent: Wednesday, December 15, 1999 6:21 PM
To: rp-ml@bart.lpt.fi
Subject: LightYear software
I have been building with 3D Systems Lightyear software for a while now and
one major process difference between this software and the old
Partman/Maestro software is the scan order of the vector. In the past, if
you had multiple parts in a build, the SLA's would draw one entire part then
move to the next part on the same layer. With the Lightyear software the
SLA's draws the boarder vectors for all the parts first, then the hatch
vectors for all the parts, then the fill vectors. Has any one else noticed
this and if so, are you experiencing any problems with the new scanning
order?
Stacie L. Van Dorin
Manager, Rapid Prototype Engineering
Solid Concepts
28231 Ave. Crocker
Valencia, CA 91355
661/257-9300
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