RE: rp definition

From: Pike, Jim (
Date: Sat Feb 03 2001 - 00:37:50 EET


Sounds good.... (RAP) Rapid Additive Prototyping!!!
              or(RAF)Rapid Additive Fabrication!!
Next thing ya know we got a bunch of RAP RAF!!!
LOL smile!


-----Original Message-----
From: Jeff Katz []
Sent: Friday, February 02, 2001 4:09 PM
To: Terry T. Wohlers; Elaine Hunt; RP-ML
Subject: RE: rp definition

What's wrong with using CNC machining to do "Rapid Prototyping?" In some
cases, depending on material and finish level, CNC machining is actually
more "rapid" then RP. If the question is how do you rapidly produce parts
directly from 3D CAD data, CNC should logically be included in the
classification, otherwise it's an arbitrary distinction.

We lump CNC and EDM in with all the others in our Rapid Manufacturing
marketplace. If you really want to distinguish SLA, SLS, FDM, etc. from
CNC, you really need to change the name from Rapid Prototyping to Additive
Prototyping or even Fabbing. Right, Marshall?

Jeff Katz
773.477.7374 x203
Fast, Free, Secure

-----Original Message-----
From: []On Behalf
Of Terry T. Wohlers
Sent: Friday, February 02, 2001 9:46 AM
To: Elaine Hunt; RP-ML
Subject: rp definition

Message text written by Elaine Hunt
>The Rapid Prototyping Report in 1992 defined RP as

The Fabrication of a physical, three dimensional part of arbitrary shape
directly from a numerical description (typically a CAD model) by a quick,
highly automated and totally flexible process.

Does this definition define what you do with rapid prototyping? Should it
be expanded and if so how would you change it?<


I've been using the following to briefly define/describe RP:

Rapid prototyping (RP) is a relatively new class of technology used for
building physical models and prototype parts from 3D computer-aided design
(CAD) data. Unlike CNC machines tools, which are subtractive in nature, RP
systems join together liquid, powder and sheet materials to form complex
parts. Layer by layer, RP machines fabricate plastic, wood, ceramic, and
metal objects based on thin horizontal cross sections taken from a computer


Terry Wohlers
Wohlers Associates, Inc.
OakRidge Business Park
1511 River Oak Drive
Fort Collins, Colorado 80525 USA
Fax 970-225-2027

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