Bubbles in Resin Vat

From: Jeff Toole (jtoole@morristech.com)
Date: Wed Mar 28 2001 - 18:55:16 EEST

I have a problem with bubbles in the resin during builds. I know it sounds a
little silly at first, but this does have consequences in part quality and
personnel utilization (someone has to be on "bubble popping patrol" at the start
of builds).

I am running SLA-250's with Doctor blades and SLA-500's with Zephyr blades.
Resins are Somos 7100/7110/7120, 8110/8100, and 9100. Supports are Finepoint
via Lightyear 1.1 w/ SP1.

The problems are twofold. First, during the initial support building phase, a
lot of bubbles can knock out supports and cause "mounding," leading to a crash.
Second is the problem of small bubbles becoming cured into the parts. This
seems to happen most with the Doctor blades as the tend to comb larger bubbles
through the Finepoint supports to create ever smaller bubbles. These small
bubbles are virtually impossible to clear from the vat once they have formed.
This doesn't seem to occur with Zephyr blades as a single pass (maybe two)
usually clears all bubbles.

Does anyone else have trouble this? Has anyone come up with any good solutions
for it?

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