{"id":20971,"date":"2025-08-15T00:27:32","date_gmt":"2025-08-15T08:27:32","guid":{"rendered":"https:\/\/shengenfab.com\/?p=20971"},"modified":"2025-08-15T00:51:39","modified_gmt":"2025-08-15T08:51:39","slug":"true-position-in-gdt","status":"publish","type":"post","link":"https:\/\/shengenfab.com\/it\/true-position-in-gdt\/","title":{"rendered":"La posizione reale in GD&T: Cosa significa e perch\u00e9 \u00e8 importante\uff1f."},"content":{"rendered":"
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

La posizione reale \u00e8 uno dei concetti pi\u00f9 utilizzati nel campo della quotatura e della tolleranza geometrica (GD&T). Offre un modo pi\u00f9 completo per definire la posizione degli elementi su un pezzo, in particolare fori e scanalature. Invece delle quote standard X e Y con tolleranze individuali, la posizione reale controlla la deviazione complessiva da una posizione perfetta utilizzando una zona di tolleranza circolare o cilindrica.<\/p>

By using True Position, engineers can control how much a feature can shift in any direction from its ideal location. This approach is much more effective than separating \u00b1 tolerances for each coordinate. It also works better for features aligning with mating parts or assemblies. Let’s break it down from the start.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Posizione\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

<\/p>

Che cos'\u00e8 la posizione reale in GD&T?<\/h2>

<\/p>

La posizione reale \u00e8 la posizione esatta di un elemento, come un foro, un perno o una scanalatura, definita in base ai datum. In poche parole, indica dove deve essere posizionato un elemento su un pezzo. Invece di concentrarsi sui valori esatti di X e Y, definisce una zona, di solito un cerchio o un cilindro, all'interno della quale deve trovarsi il centro dell'elemento.<\/p>

<\/p>

This zone is centered on the theoretical location, called the “nominal” location. The part is considered acceptable if the actual center of the feature falls within the zone. The size of the zone depends on the allowed tolerance, which is specified in the feature control frame.<\/p>

<\/p>

For example, if a hole’s true position tolerance is 0.2 mm, the center of that hole must fall within a 0.2 mm diameter circle around the exact target location. Whether the hole shifts left, right, up, or down, it’s still okay if it stays inside that circular area.<\/p>

<\/p>

True Position is often used with other GD&T symbols, such as datums, material condition modifiers like MMC (Maximum Material Condition), and basic dimensions. These elements work together to describe a feature’s location, size, and limits more clearly than traditional tolerancing.<\/p>

<\/p>

Simboli e terminologia chiave<\/h3>

<\/p>

To work with True Position, it’s important to understand the key symbols and terms used in a GD&T feature control frame. These elements define how the tolerance is applied and what measurements matter.<\/p>

<\/p>