With restriction

With restriction refers to an assembly process in which obstructions may occur due to poor visibility or insufficient space.

With restriction sight:

Restriction due to visibility means that the field of vision, required to perform the assembly job, is obstructed. The positioning location is obscured or cannot be fully seen. Thus, the positioning process is performed in the “blind” or requires a sense of touch.

With restriction space:

Restriction due to space means that the space available for the assembly process is restricted. Accessibility is limited, either at the positioning location itself or at its surroundings. This requires additional auxiliary or corrective motions.

Rule M-B1:

In the case of restriction due to space or visibility, a frequency of 1 is entered in the corresponding column.

Rule M-B2:

In the case of restriction due to space and visibility, both types of restriction are evaluated with a frequency of 1.

Rule M-B3:

If when positioning a component, the positioning locations are hidden by the component itself, restriction due to visibility is analyzed.

Without positioning aids

Ohne Positionierhilfen beschreibt einen Montagevorgang, bei dem weder am Bauteil noch an der Fügestelle Positionierhilfen, z. B. Anschläge, Führungen usw., vorhanden sind.

Without positioning aids:

Missing positioning aids inevitably result in assembly interferences.

w/o positioning aid

with positioning aid

With fixing of position

With fixing of position refers to an assembly process in which a component or sub-assembly is not in a stable (final) position after initial positioning.

With fixing of position:

Fixing of position comprises all measures necessary to keep a part in a specific position until it has reached a stable position through a subsequent assembly process.

Fault assembly

Fault assembly position possible refers to an assembly process in which it is possible to assemble a component or sub-assembly in more than one way. One or more of the possible positions may be wrong (Poka Yoke).

Die Konstruktion lässt es zu, dass ein Bauteil bzw. eine Baugruppe in mehrere Einbaulagen gefügt wird. Dadurch kann bei gewissen Bauteilen bzw. Baugruppen Nacharbeit erforderlich werden oder ggf. die Funktion gefährdet sein. Um dies zu vermeiden sollten Bauteile bzw. Baugruppen so konstruiert sein, dass keine falsche Einbaulage möglich ist (siehe Prinzipskizze oder z. B. Nase an einem Stecker mit definierter Poligkeit).