⌰ Total runout

How to verify

For a cylindrical surface, mount the part between centers and move the indicator axially from one end to the other WHILE the part rotates continuously (not turn by turn with stops): the maximum minus the minimum reading over the whole traverse is the total runout. For a face perpendicular to the axis (axial total runout), the indicator sweeps from the center to the edge while the part rotates, which also detects any perpendicularity deviation of the face relative to the datum axis.

Workshop guideline values

General

0.05–0.12 mm on long cylindrical surfaces in general machining.

Accuracy

0.02–0.05 mm on bearing seats or tight sealing surfaces.

High precision

0.005–0.015 mm on long precision shafts.

Guidance only: the drawing's value always wins.

Common mistakes when interpreting it

• Confusing it with section-by-section circular runout: total runout requires a continuous sweep without stops along the whole part, not several independent spot readings.
• Accepting a part because it passes circular runout at each individual section: that does not guarantee passing total runout, because a progressive taper can build up along the length without any single section failing.