Gear Metrology. Requesting help in processing raw XYZ, PLY or STL data from a point cloud files in order to obtain gear geometry in the form of a gear report.

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Denis Sexton
Denis Sexton 2024-8-21
评论： Denis Sexton 2024-10-11
I have measured gears via the optical focus variation method with a confocal microscope, and I have collected point clouds. I can provide the data in either STL, PLY or simple XYZ coordinates (as well as a drawing and possible CAD model). Normally, on a coordinate measuring machine (CMM) the gear report would be created automatically from the collected XYX coordinates via standard gear software. Gear software is not available for the microscope, so I am hoping that this can be done in Matlab. I am now looking for someone who has knowledge or experience in creating a gear report from raw data. I am a basic MATLAB user, but I believe that this should be possible (can anyone advise please?).
  2 个评论
Udit06
Udit06 2024-8-26
Hi Denis,
MATLAB offers several functions for reading and preprocessing 3D data. To assist community members in providing better support, it would be beneficial if you could share a sample data file along with the expected format of the gear report.
Thanks

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回答（1 个）

Ayush
Ayush 2024-10-11
Hi @Denis Sexton,
I understand you want to create a gear report using MATLAB.
As the link for the sample data is not accessible, I am using a sample data which I generated using the following script. This is an example demonstration to use MATLAB for 3D data processing.
% Generate sample gear-like point cloud data
theta = linspace(0, 2*pi, 100); % Angle for full circle
radius = 10;
tooth_height = 2; % Tooth height
tooth_width = 2; % Tooth width
% Generate points for the gear body
x_body = radius * cos(theta);
y_body = radius * sin(theta);
z_body = zeros(size(x_body));
% Generate points for teeth
num_teeth = 10;
for i = 1:num_teeth
angle = (i-1) * (2*pi/num_teeth);
x_tooth = [0, tooth_width, tooth_width, 0] + radius * cos(angle);
y_tooth = [0, 0, tooth_height, tooth_height] + radius * sin(angle);
z_tooth = [0, 0, 0, 0];
hold on;
plot3(x_tooth, y_tooth, z_tooth, 'k'); % Plot teeth
end
% Save the points to an XYZ file
xyz_data = [x_body', y_body', z_body'];
writematrix(xyz_data, 'sample_gear.csv’);
Now, using this sample data, you can create the gear report using the pseudo code given below:
% Load the sample data
data = readmatrix('sample_gear.csv');
% Extracting x, y, z coordinates
x = data(:, 1);
y = data(:, 2);
z = data(:, 3);
% Create a point cloud
ptCloud = pointCloud([x, y, z]);
% Visualize the point cloud
figure;
pcshow(ptCloud);
title('Point Cloud of Sample Gear');
xlabel('X'); ylabel('Y'); zlabel('Z');
% example: Try to Fit a plane to find the base of the gear
model = pcfitplane(ptCloud, 0.01);
fprintf('Plane Model:\n');
disp(model.Parameters); % Displaying plane parameters
% Calculating pitch diameter (example calculation)
pitch_diameter = 2 * (radius + tooth_height);
fprintf('Estimated Pitch Diameter: %.2f\n', pitch_diameter);
% Create a report
reportData = table();
reportData.Parameter = {'Pitch Diameter'; 'Number of Teeth'};
reportData.Value = {pitch_diameter; num_teeth};
% Save the report to CSV
writetable(reportData, 'gear_report.csv');
Here are the required documentation links which you can access to get more information:
  1. “pcfitplane” function: https://www.mathworks.com/help/vision/ref/pcfitplane.html
  2. Point cloud: https://www.mathworks.com/help/vision/ref/pointcloud.html
  3. “pcShow” function: https://www.mathworks.com/help/vision/ref/pcshow.html
Hope this helps!

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