EZtol is a 1-Dimensional tolerance stack up analysis program designed to assist in understanding the impact of the accumulation of part-level dimensional variation and part-to-part assembly variation sources and the impact that they have on assembly-level requirements.
Today such analyses are performed in a spreadsheet, most commonly Microsoft® Excel®. Much work is required in creating spreadsheets that manage all of the product requirements simultaneously with consideration of common dimensions and tolerances that feed each one, properly including the impacts of the more complex geometric tolerances, and properly calculating the statistical results. Analysis spreadsheets often include a visual diagram either from the model or an assembly-level drawing to help explain the components of each of the analyses, but these too must be maintained as updates are made.
Oftentimes all the work creating these spreadsheets doesn’t reveal the full story, because a 1-dimensional stack up analysis may under-predict the actual assembly-level variation. EZtol helps you understand when these scenarios arise. It warns the user if the tolerance stack-up may not be 1D in nature with a note that the results provided may underestimate the actual variation that will occur during production.