GD&T, Fits & Tolerancing
A practical tolerancing hub for datums, position, fits, tolerance stack-up and drawing release.
Start with the design logic
Good tolerancing is not about adding more symbols. It is about controlling the features that matter to assembly, function and inspection while leaving noncritical geometry economical to make.
GD&T Basics
Understand why geometric controls complement size tolerances.
Open →Datum Selection
Build a datum reference frame from function and inspection logic.
Open →Position Tolerance
Control axes and center planes using basic dimensions and a tolerance zone.
Open →Tolerance Stack-Up
Compare worst-case and RSS-style accumulation.
Open →Drawing Release
Review identity, dimensions, tolerances, notes and revision state before release.
Open →GD&T Toolbox
Explore common controls and datum-reference logic.
Open →Fit Calculator
Calculate minimum and maximum clearance/interference from limit dimensions.
Open →Stack Calculator
Build a transparent one-dimensional tolerance stack.
Open →Release Assistant
Create a repeatable drawing-release gate.
Open →Use DIVE-LD as a workflow
Read the concept, use a transparent calculator where useful, then verify the actual design against material data, process capability, supplier feedback and the standards that govern the release.