RE: Raising Liquid Levels in SLA250

From: Zubrickie, Robert F (
Date: Tue Oct 09 2001 - 15:03:15 EEST

This is a good idea and I like the fact that people are willing to put out
suggestions whether they will work or not. This is a sign of ingenuity.
Weather you have a SLA250/30 or a SLA250/50 this suggestion unfortunately
will not work. Reason being, the laser system which monitors the level of
resin is located on the left side of the 250/30 or on the back side of the
250/50 works like this. The laser must bounce off the surface of the resin
at a angle of about 20 degrees and hit a photo sensor apposing the laser. As
the level of resin goes down the laser reflection misses the photo eye. As
you increase the level of resin in the vat to the required level the laser
eventually hits the electric eye and the machine beeps indicating the resin
is at the specified level. By dropping the platform in the resin farther
will not change the algorithm of machine startup. Resin level will be
monitored before the build will start. If there was a way to bypass the
sensing of the level of resin your suggestion would work. I don't believe
this is possible or if anybody really wants to mess with the software. Keep
the ideas coming. This is what this mailing list is all about.

        Global Communications, Computer & Consumer Electronics Business Unit
| Robert F. Zubrickie
|Manufacturing Engineer
|Rapid Prototyping Area
|3101 Fulling Mill Road, MS 128-98
| Middletown, Pa 17057-3164
| E-Mail:
| Phone - (717) 592-5208
| Fax - (717) 592-4943

-----Original Message-----
From: []
Sent: Tuesday, October 09, 2001 6:50 AM
Subject: Re: Raising Liquid Levels in SLA250

Instead of raising the resin level up, try lowering the platform to a new
"starting position" after every build. I never tried it before but I'm
quite sure it can be done. Any platform lowering experts out there? Hope
this helps. Good luck.

David Oblak
Senior Mech Designer/RP
Beckman/Coulter Inc.
Miami, Fl

******************************* ************

Does anyone out there know what can be used in an SLA machine to take up
the volume in order to raise the liquid level in the vat? We're in the
process of changing resins and want to be able to use as much of the
existing vat as possible; as we're trying to get as much life out of our
current resin as we can before the changeover.

Any ideas you can give us would be much appreciated.

Michael Schmit
Schmit Prototypes, Inc.
1801 Indianhead Drive
Menomonie, WI 54751

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