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Technology Stocks : Stratasys (SSYS)

SSYS 9.450

-4.0%

3:59 PM EST

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To: Stratajema who wrote (77)	2/25/1997 10:14:00 AM
From: Brian VanHiel	of 316

David: My reasons for doubts of the success of metal prototypers: There are two additive (as oppossed to NC machining which is subtractive) methods to making metal prototypes. The first is to weld particles together in a method similar to 3D welding. This is slow and produces a great deal of heat, and heat causes accuracy problems. Similar to this is a process which uses a laser and a directed stream of metal particles. The second method is to 'glue' the particles together using a thermoplastic binder. This is what MIT's 3D printing and DTM's RapidTool process. These processes require that the binder be burned out in a furnace (a couple of days of post-processing). Unless you have a part that is impossible to make by any other means these processes simply lose the race againts NC machining and even a half-way decent machinist with a Bridgeport mill. If you do have a part that is impossible to make conventionally, I would build an SLA model and investment cast it. I would get a more accurate part in the same period of time for less money. -Brian

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