Tag: form

Circularity

by Jason Richter on July 24, 2026.

Controls how round a cross-section must be at any given slice. Applied independently at each cut — it doesn't control the overall cylinder.

Effects of Larger Tolerance Values

by Crystal Bemis on November 11, 2024.

Jason reviews the effects of tight position controls on features that relate to datum features with much larger form tolerances.

Straightness

by Tom Geiss on November 6, 2014.

Controls how straight a line element or axis must be. Can apply to a surface line or to an axis — and the difference matters more than most people realize.

Flatness

by Tom Geiss on November 3, 2014.

Controls how flat a surface must be. No datums needed — it's self-contained, making it one of the simplest form tolerances to apply.