{"id":11583,"date":"2021-11-16T17:34:01","date_gmt":"2021-11-16T15:34:01","guid":{"rendered":"https:\/\/fractory.com\/?p=11583"},"modified":"2024-01-26T14:12:25","modified_gmt":"2024-01-26T12:12:25","slug":"perpendicularity-gdt-explained","status":"publish","type":"post","link":"https:\/\/fractory.com\/perpendicularity-gdt-explained\/","title":{"rendered":"Perpendicularity (GD&T) Explained"},"content":{"rendered":"

There are 14 types of geometric tolerances in GD&T<\/a> according to ASME Y14.5-2009<\/a>. These 14 tolerances can be categorized into five main groups: form, profile, orientation, location and runout.<\/p>\n

Perpendicularity is a type of orientation control. Orientation controls define the orientation of a feature with reference to a datum plane or axis. Angularity and parallelism<\/a> are other callouts in orientation control besides perpendicularity.<\/p>\n

This article will explain the various aspects of perpendicularity and its two types in detail.<\/p>\n

What Is Perpendicularity?<\/h2>\n

Exact perpendicularity between features is very difficult to achieve. The perpendicularity callout establishes limits within which a feature must lie to be accepted as reasonably perpendicular.<\/strong><\/p>\n

Similar to GD&T straightness<\/a>, there are two ways in which perpendicularity may be applied. It can control the perpendicularity of a surface or an axis. Let us explore each type.<\/p>\n