RE: [rp-ml] Stl for CNC and spray on fiberglass

From: Eric Stone <>
Date: Mon Apr 26 2004 - 21:10:04 EEST


I also offer the case studies: or

The Rivage case study illustrates a concept-to-production flowchart relying
heavily on optical digitizing, and direct-milling on digitized .STL files.
In this case, the process was as follows:
1) digitize a full-scale Porsche frame
2) CNC a scaled-down version of the digitized frame
3) apply clay over the scaled-down frame to the desired shape of the car
4) digitize the clay car body
5) CNC a scaled-up (i.e. full-size) car from digitized data
6) Make final modifications to the full-size clay and apply tape (body
detail) lines
7) digitize the final clay full-size model, including tape lines
8) CNC the layup tooling and/or body panels from the full-size digitized
9) the body panels now fit onto the original Porsche frame.

The Rivage drove onto the floor at Euromold 2002.

The art.html document shows sample digitized/RP outputs, for your and the
list's interest.

Again, please contact me with any questions.

Eric Stone
Capture3D, Inc.

-----Original Message-----
From: []On
Behalf Of Eric Stone
Sent: Friday, April 23, 2004 6:00 PM
To: Jonathan Chertok;
Subject: RE: [rp-ml] Stl for CNC and spray on fiberglass


Yes, there are machining softwares that can handle .STL files, while others
cannot. Of those that can, some can handle large data sets (such as
generated by an optical digitizer), while others are limited in polygon

An additional way to make the transition from .STL to a CAD-based
surface/solid is to surface or solid model the .STL file. This increases
the number of CNC packages that will be able to machine off the data.
Again, there are softwares that accomplish this "conversion" very
effectively, and others that require a tremendous (i.e. prohibitive) amount
of labor. Of those that accomplish the task effectively, the quality of the
surface is a factor in the amount of time required to create the CAD model.
The quality of the CAD model translates into machining time and the amount
of hand-finishing necessary, and again, portability between CAM packages.

Please contact me with any questions.

Eric Stone
Capture3D, Inc.

-----Original Message-----
From: []On
Behalf Of Jonathan Chertok
Sent: Friday, April 23, 2004 12:39 PM
Subject: [rp-ml] Stl for CNC and spray on fiberglass


Can anyone give me the lowdown on what might (or might not) be required for
getting an stl file into a CNC-friendly format?

I have a series of stl's and was interested in taking four of them and using
them for CNC output of the file.

Is a conversion necessary and if so, does it depend on the type of machine,
geometry of the file or what exactly.

I'd be interested in knowing if there are any technically savvy CNC outfits
in the Austin/Texas area as well.


This is a little off-topic, however does anyone know where I might find good
information/techniques/case studies for applying a large scale fiberglass
type surface to a frame or armature?

Can I spray-on fiberglass using a conventional paint gun?

Are there other material combnations that I should look at?

Much thanks,


Universal Joint: Buildings + Digital Design

Jonathan Chertok. Principal
Austin, Texas [512] 407 9628

Full Service Design and Construction

Lose those love handles! MSN Fitness shows you two moves to slim your waist.
Received on Mon Apr 26 20:22:52 2004

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