Ken and All,
I'll send this to help eliminate excess email:
Both Accumax and Christmas Trees were run on the equipment both after the
laser was installed and then last week when the problem started cropping up
and the results from both are the same and on target. I should note that
all other geometry's are meeting their respective requirements.
Karl
-----Original Message-----
From: Ken Zukley [SMTP:ken@interpro-rtc.com]
<mailto:[SMTP:ken@interpro-rtc.com]>
Sent: Tuesday, September 07, 1999 11:21 AM
To: KDenton@williams-int.com <mailto:KDenton@williams-int.com>
Subject: Re: Build Problems with SLA and Confused!
Hi Karl:
You may hear this more than once, but, after the replacement of the laser,
Were Christmas trees/Accumax run on this machine? This is just a quick
thought, and I am sure more in detail will follow from the list. They are
very helpful in trying to help with this sort of problem.
Regards
Ken Zukley
InterPRO Rapid Technologies
At 10:19 09/07/1999 -0400, you wrote:
>Hello all,
>
>Yes I'm back on the list and in need of help!
>
>With out describing the parts in full this may be difficult but I'm
hopeful
>that someone will have an answer because its completely baffled me!
>
>I have been building a part that looks like a turbine and the
orientation is
>such that the build lines are in the direction of air flow. This
provides
>us with the best possible looking blade and the least amount of
cleanup both
>with regard to supports and general part cleaning. The parts are
small and
>we are building them on an SLA-500 using SL5180 and QuickCast 2.0.
The room
>that the equipment is in is climate controlled such that the
temperature has
>not deviated from 72 degrees F and the humidity has not deviated
from 32%
>in the fours years that the lab has been in operation. Resin
temperature is
>at 31 degrees C. When the first set of these patterns were built
in April
>and May of this year they were within .002" of tolerance and we
satisfied
>the customer (engineering) with the required number of castings.
Knowing
>that the part would be required again in several months I placed
the build
>files ( .bff) on a separate hard drive for later use. Two weeks
ago I was
>asked to rebuild several patters and now they are .020" to .030"
out of
>tolerance. In one case the part is .020" out on one dimension and
right on
>another dimension. One part comes in large while another comes in
small.
>Literally the only thing that has changes is a new laser and all
other parts
>seem to come in. These parts by the way are segments and when
enough are
>complete they are assembled to a fixture. At this point I am
thinking it's
>the human variable and not the machine that is causing things to go
crazy.
>Any all comments would help.
>
>Sincerely,
>
>Karl Denton
>Lead Engineer
>Williams International
>
>For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
<http://ltk.hut.fi/rp-ml/>
>
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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