Alvin,
It is possible that you have a "mirror drift" issue with your machine. We
had a similar problem with our SLA350 long time ago where vertical walls
would appear like ruffled potato chips. After some struggle, 3D identified
the problem to be buildstation software failure to correct mirror-drift
after each layer. It appears drift correction is taking place on your
machine after every 5mm or so. However, what 's puzzling me is the amount
drift (2mm in your case) you are seeing. We only saw about 0.5mm.
Hope this helps.
Regards,
Kamesh
> -----Original Message-----
> From: Cheong Toh Kim Alvin [SMTP:CheongA@thmulti.com.sg]
> Sent: Friday, November 20, 1998 4:06 AM
> To: rp-ml@bart.lpt.fi
> Cc: Neo SM
> Subject: SLA - Part Building Issue
>
> Since 2 weeks ago, we started getting parts out from the SLA500 with
> undesirable results unseen before.
>
> From the look of the part, it sure looks like after certain height of
> building, there was a shift of about 2mm in the X direction & this off-set
> position remained over the next 5mm build before it returned back to the
> original position. It remained so for a certain height before the same
> thing
> happened again with the literally same off-set & duration. This would
> self
> repeat over & over again throughout.
>
> The platform is well secured down & even if it's not, surely a mechanical
> shift if any would unlikley yield such a consistent pattern of steps on
> the
> part. It can't be the blade sweeping action along the Y axis either as
> the
> shift is along the X.
>
> I wonder has anyone out there observed this rather strange phenomenon &
> the
> solution??
>
>
> Alvin Cheong
> Thomson mutimedia
> cheonga@thmulti.com.sg
>
>
>
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