Rapid Prototype Casting - sci.engr.manufacturing #1422

From: Mike Branciforte (Eastman Kodak  Company)
To: RP-ML
Date: Friday, October 14, 1994
Subject: Rapid Prototype Casting - sci.engr.manufacturing #1422
In article <36s12s$kdc@bones.et.byu.edu>, brianh@alaska.et.byu.edu (Brian Hinckley) writes:
|> 
|> I am attempting to investment cast rapid-prototyped parts.
|> I am using a Helisys LOM machine to create laminated patterns.
|> I understand that SLA is being used more often.
|> Has anyone had success with this process using LOM patterns?
|> 
|> Do you have answers to the following questions?
|> 
|> 1.  What kind of (if any) coating should be used on the pattern
|>     before dipping into the slurry?
|> 
|> 2.  Is one slurry mix better than others for this?  I understand there
|>     are sometimes some cracking problems resulting from pressure in the
|>     furnace.
|> 
|> 3.  Upon firing, ashes in the form of the sheets of paper are left in
|>     the shells.  Is there a way to promote further decomposition of these
|>     ashes to an "ashtray-looking" type of powdery ash?
|> 
|> 4.  Have you had any success in rinsing out the ash with liquid agents of
|>     some kind?  Is there something that will dissolve ash?