Here's how we at PDT create Parametric feature based Pro Engineer models
while reverse engineering:
1. Laser scan the entire part, accuracy of scan data 0.001". Not as
accurate as a CMM but many more points, less interpolation in between
points which results in a more accurate CAD model.
2. Cut cross sections through the point cloud creating b splines in the x,
y, and z planes.
3. Import the b splines into Pro E and use them as templates to build
feature based geometry. You could surface the b splines or points but
that would be very non-parametric as the b splines are controlled by
hundred's or thousands of points. The trick is to NOT tie the geomety to
the b splines.
4. We use our CAV inspection process to compare the solid model we created
to the actual part and make any modifications necessary.
Perhaps you would be better off reverse engineering the die blocks for the
forging if that is your end goal anyway??
Best Regards
John Jarvela
Product Development Technologies
1253 N. Old Rand Road
Wauconda IL 60084
phone: 847-487-2800
fax: 847-487-2250
email: johnj@pdt-cav.com
web: http://www.pdt-cav.com
> ----------
> From: Jack Feng[SMTP:cfeng@bradley.bradley.edu]
> Sent: Wednesday, February 10, 1999 9:27 AM
> To: rp-ml@bart.lpt.fi
> Subject: Multiple feature solid model from reverse engineering
>
> Hi RP-List,
>
> We are seeking a reverse engineering project which will require to
> generate
> a multiple feature (feature by feature) solid model in Pro/E for a very
> complicated forging die. What we are given is the forged part only. What
> we
> are doing now is to use the Mitutoyo RV57 CMM in our lab to scan the
> surfaces (2-5 micrometer accuracy), and use the built-in Scanpak software
> to convert the scan data into IGES file. From there we will generate the
> Pro/E solid model of the forged part, then reverse it to the die model.
> Since this is a single feature model, it does not fulfill the possible
> final requirement of design modifications and manufacturing process
> simulation (we are not sure if we shall/can add this part into the
> project).
>
> Any comments and ideas helping the above process will be appreciated.
>
> For most of my friends originated from East Asia, happy new year to you.
>
> Sincerely,
>
> Jack Feng
>
> **************************************************
> Dr. Chang-Xue (Jack) Feng
> Associate Professor
> Dept. of Industrial and Manufacturing Engineering
> 102 Morgan Hall
> Bradley University
> Peoria, Illinois 61625
> Tel: 309/677-2986 Fax: 309/677-2853
> Home page: http://bradley.bradley.edu/~cfeng
> **************************************************
>
>
> For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
>
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