CAD_1_2

by Tim Lueth & Laurans de Smedt, SG-Lib Toolbox: SolidGeometry 5.6 - Modeling function
Introduced first in SolidGeometry 2.4, Creation date: 2015-06-29, Last change: 2025-08-19

PUBLISHABLE EXAMPLE of Excercise CAD 1.2

Description

This function is an example how to solve the excercise 1.2 of the
"Rechnerintegrierte Produktentwicklung - CAD und CAD/CAM" (2015)
of Professor Dr.-Ing. Udo Lindemann

Example Illustration

missing image of CAD_1_2

Syntax

CAD_1_2




Copyright 2015-2025 Tim C. Lueth. All rights reserved. The code is the property of Tim C. Lueth and may not be redistributed or modified without explicit written permission. This software may be used free of charge for academic research and teaching purposes only. Commercial use, redistribution, modification, or reverse engineering is strictly prohibited. Access to source code is restricted and granted only under specific agreements. For licensing inquiries or commercial use, please contact: Tim C. Lueth

Algorithm (Workflow)

This algorithm is a MATLAB script designed to create a 3D model of a part using CAD techniques. The script is structured to define a 2D contour, extrude it into a 3D shape, and then modify it by subtracting cylindrical holes. Below is a detailed explanation of the algorithm and its parameters.

Input Parameters

Algorithm Steps

  1. Initialize the environment by closing all figures and starting a timer with close all and tic.
  2. Define the outer contour of the part as a rectangle with vertices at (0,0), (160,0), (160,50), and (0,50). This is stored in the variable PL.
  3. Convert the defined polygon PL into a closed polygon line using CPLofPL(PL).
  4. Create a new figure and set the view to a top-down perspective using VLFLfigure and view(0,90).
  5. Plot the outer contour using CPLplot(PL).
  6. Create a circular contour with a radius of 13.5 mm using PLcircle(13.5) and store it in PLR.
  7. Subtract two circles from the rectangle at positions (40,50) and (120,50) using CPLbool('-',PL,PLtransP(PLR,[x,y,0])).
  8. Plot the modified contour in blue using CPLplot(PL,'b').
  9. Extrude the 2D contour into a 3D solid with a height of 12 mm using SGofCPLz(PL,12) and set the view to an isometric perspective.
  10. Rotate the solid to a 'standing' position using SGtransR(A,rotdeg(90,0,0)).
  11. Plot the solid using SGplot(A).
  12. Create a cylindrical solid for drilling holes with a diameter of 6.1 mm and a height of 60 mm using SGofCPLz(PLcircle(6.1/2),60).
  13. Center the cylindrical solid within the main solid using SGincenter(B,A).
  14. Subtract the centered cylindrical solid from the main solid to create the first hole using SGbool('-',A,B).
  15. Align the cylindrical solid to the left and right of the main solid and subtract to create the second and third holes using SGalignleft(B,A,7.5) and SGalignright(B,A,7.5).
  16. Plot the cylindrical solid in green using SGplot(B,'g') and set the view to an isometric perspective.
  17. Create a new figure for the final solid and set the view using SGfigure(A) and view(-30,30).
  18. Add lighting to the plot using VLFLplotlight(1,0.9).
  19. Stop the timer and display the elapsed time using toc.
  20. Export the final 3D model to an STL file named 'CAD_1_2' using SGwriteSTL(A,'CAD_1_2').
Algorithm explaination created using ChatGPT on 2025-08-19 07:37. (Please note: No guarantee for the correctness of this explanation)

Last html export of this page out of FM database by TL: 2025-09-21