Re: same song - Layer Thickness reply
From:
Lee Humphrey (Lockheed-Martin Corporation)
Date:
Saturday, January 21, 1995
From: Lee Humphrey (Lockheed-Martin Corporation)
To: RP-ML, Elaine Hunt (Clemson University)
Date: Saturday, January 21, 1995
Subject: Re: same song - Layer Thickness reply
To: rp-ml@cs.hut.fi, persall@eng.clemson.edu
I do not use thin layers very much. Probably 80-90% is at .010" on
the SLA250(5149) and 100% at .006" on the SLA500(5180). Main reason
is time vs need. There will usually be 1000 to 3000 layers in a SLA500
build and the process time will go from 4-5 Days to almost 2 weeks for
a single build. In the least 5500 hours on the SLA500, halving the
layers would have ment only half the runs in the same time period. We
are mainly interested in going the other way to increase throughput.
On the SLA250 I have easily and reliably built at .005" with 5149
resin. I have have limited success with .003". The success window is
much smaller and very geometry dependent. Success with .004 but that
is not much different than .005".
For productivity reasons and the larger types of geometry I usually
work on, I almost always use the standard .010 and .006 for the 250
and 500 machines.
My main concern for the SLA500 is in tank resin stability which has
not been good this past year but I am hopeful for the new year. The
5149 in the SLA250 has been an extremely stable, predictible resin.
it may warp alittle more than others but it has been very predictible
for 2 years which is an eternity in this field.
lee_humphrey@ccmail.orl.mmc.com
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