RE: Adaptive slicing challenge.

From: Georges Fadel (
Date: Tue Feb 25 1997 - 17:38:21 EET

In a message dated Tue Feb 25 09:56:43 1997, Kamesh Tata wrote:

In a message dated 97-02-25 00:13:09 EST, you (Raymond Hope) write:

 Lets consider a threaded bolt. In the threaded section the best results
 will be achieved with fine layer thicknesses, but for the head of the bolt,
 and the unthreaded section, much thicker layers can be used with no loss
 of detail. My problem is mainly in finding a robust procedure to select
 the best layer thickness in the threaded section, to keep the error within a
 specified tolerance. In this case, using the curvature to estimate error
 not work as the triangular threads have zero curvature. So what do we use
 in this case as the criteria to select the layer thickness?

As a part of my Master's thesis, I developed an "efficient" slicing algorithm
which includes varying layer thickness in relation to surface complexity,
recognizing and retaining key characteristics (like tip of a cone, horizontal wall )
etc. It was implemented in C and takes an STL file as input. The algorithm was
validated on an SLA 250 and a CNC machine. I built several geometries including
International Manufacturing Systems Test Part1 (IMS-T1). You should be able to get
a copy of my thesis from Clemson University, South Carolina. You can contact my
advisor Dr. George Fadel at 864 656 5620.

Kamesh developed the adaptive slicing technology under the supervision of
Dr. Amit Bagchi, and finished his work under my supervision. He recently
obtained a patent (January 21, 1997) on the adaptive slicing technology and
the technology is presently marketed by Clemson University. If you are interested
in using that technology, please let me know. The University will negotiate
with interested individuals or companies the license to use that technology
and the software that implements it.
As Kamesh mentioned, his approach has the advantage of recognizing key features
and using this information in tandem with the surface complexity to generate
the appropriate slice thickness. This methodology is protected by his patent.


Georges M. Fadel 
Associate Professor
Mechanical Engineering Department			Tel: (864) 656-5620
Clemson University					Fax: (864) 656-4435
Clemson SC 29634-0921 USA

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