RE: [rp-ml] A public survey on terminology

From: Tom Johnson (
Date: Wed Aug 10 2005 - 21:30:18 EEST

This discussion has been interesting. I used to have a promotional video
showing a man (Chuck Hull?) using a hand held laser to draw a line on
the surface of a cup of liquid, then using a stick to lift a string of
cured plastic out of the liquid. He used the term "stereolithography"
because it literally meant 3 dimensional lithography or 3D Printing. The
video went on to show the SLA-1 machine with a part rising out of the
vat of liquid. Soon after, in late 1988, I received McDonnell Douglas'
own SLA machine and set up and ran the MDC SLA lab for a year or so.

I like the term, Stereolithography, as descriptive of all the RP
processes, but it is copywrited by 3D Systems for the process of using a
laser to create a part from a liquid polymer.

Tom Johnson

-----Original Message-----
From: [] On
Behalf Of Schaefer, Nick
Sent: Wednesday, August 10, 2005 10:01 AM
To: Steve Baker
Subject: RE: [rp-ml] A public survey on terminology

Thanks Steve!!

I figured if I waited a bit, someone would reply with the same or
similar opinions that I am thinking, and I could agree and maybe add an
extra comment or two and save me a lot of typing.

As it turns out, you stated my thoughts so well that no extra comments
from me are required.

Best regards,

Nick Schaefer
   Hewlett Packard
   Boise Site Mechanical Engineering Services
   Phone: (208) 396-4884

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