Welcome to MCAD Central

Join our MCAD Central community forums, the largest resource for MCAD (Mechanical Computer-Aided Design) professionals, including files, forums, jobs, articles, calendar, and more.

Register Log in



New member
Pls tell me about the relative and absolute accuracy. I don't understand what these mean, and what the difference between them. Thank in advance!


New member
Accuracy determines the length of the smallest edge Pro will recognize in your model, or the largest gap between 2 edges that will still be considered joined. Relative accuracy is a ratio between the smallest edge in your model and the longest dimension across your model. Absolute accuracy is a specific dimension for the smallest permissable edge (or the largest permissable gap)in a model.

If a part is 20" long with relative accuracy of .001, the smallest edge Pro will recognize without geometry check errors is .02". If the same parthas absolute accuracy of .001, the smallest edge recognized is .001". Hope that clears it up.