Calculators for measurement, quality and sheet metal work
Each tool follows the published standard or textbook method, shows its working, explains the method with a worked example, and prints a report you can attach to your records. Everything runs in your browser.
Sheet metal and press tools
Deep drawing: blank diameter, draws and forces
Cylindrical cup with or without flange: blank diameter term by term on the mean fibre, number of draws with the diameter and height after each, drawing and blank-holder forces, and a section sketch.
Measurement and quality
Tolerance stack-up: worst case, RSS and Monte Carlo
Add and subtract the dimensions around a gap, with asymmetric tolerances: gap limits by worst case and root sum square, expected ppm outside your limits, a Monte Carlo check and the contribution of each dimension.
Gage R&R study (ANOVA and average and range)
Paste your operator × part × trial readings: repeatability, reproducibility, %GRR against study variation and tolerance, ndc, the ANOVA table and charts, following the AIAG MSA manual.
Process capability: Cp, Cpk, Pp, Ppk
Paste your measurements: capability indices with confidence intervals, expected ppm, a normality test, a histogram and an X̄-R or I-MR control chart. Also available as an Excel template.
Measurement uncertainty budget
Type A and Type B sources, sensitivity coefficients, effective degrees of freedom, coverage factor and a printable budget, following the GUM and EA-4/02. Also available as an Excel template.