Re: STL format MISINFORMATION (long)

From: Elaine Hunt (Clemson University)
Date: Friday, October 7, 1994

From: Elaine Hunt (Clemson  University)
To: Michael Brindley
Cc: RP-ML
Date: Friday, October 7, 1994
Subject: Re: STL format MISINFORMATION (long)
>> Ed Gargiulo did report at the 1990 SLA Usersg group meeting that slicing
>> the user part took 2.5 hours on a
>> 386 computer. gargiulo@a1.umc.dupont.com
>
>I looked it up.  The documentation with the SLA Usersgroup part states
>a slice time of 5 hours, 55 minutes, and 30 seconds on a 16 MHz 386
>system.

What report was you reading?At the 1990 user meeting in San Antonio, Ed
reported the following.

" In passing I should note our experience with the old and new versions of
the Slice software.  On the NEC 386 the  version 3.6 software sliced this
part to the standard recipe in 96-97 minutes (our and other users
experience according to the data provided).  The version 3.64 solftware
sliced this model in 53.5 minutes without compensation and 95 mnutes with
compensation on the Nec 386. "

I looked back through the reports and found my original data for my part. I
was using the Wyse 286 at that point to build and the NEC 386 to Slice as
was most users at this time.  My model sliced in 1 hour 36 minutes and 32
seconds using standard recipe and no compensation. Build time with at a
laser power of 6.64mw
was 43 hours. Build date was August 23, 1990.

I built a second part on October 11, 1990.  Laser power was at 26.77mw and
took 26.6 hours. Part took 48 minutes and 38 seconds to slice again using
standard recipe with no compensation.

Chris O' Neill's study using a one inch sphere to slice across many
platforms.  I personally slice that file on as many 386-486 machines as I
could get my hands on. It sliced the best for me on a NCR 486-66 with 12m
memory and no memory management running. It sliced at 3 minites 0 seconds
minutes.
He reported  the SGI Indigo R4000 took about  3 minutes.

It was interesting to note that some machines with 8m of memory out did
some with 16m.  How the machine
is configured does effect how slice time vary. Chris suggested scaling on a
CAD system before slicing, reducing MSA to minimize near flat triangles,
setting MAS to 0 if you don't need skill fills, and breaking the part into
as many pieces as practical.


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