Change in positioning axis or direction
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Change in positioning axis or direction refers to the components, that require a change of the axis or direction (leaving the defined positioning axis) in order to reach its final position. A change in the direction of installation is required when the installation direction of a component does not match the defined primary installation direction. A change in fastening direction exists if a component or sub-assembly has to be fastened in more than one fastening axis/direction at the destination. |
Explanation:
The aim should be to position and fasten all components or assemblies in only one direction. This requires defining a coordinate system in order to illustrate the defined positioning axis and positioning or fastening directions.
 Defining a coordinate system |
 Change in positioning direction |
Example: |
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Changing of positioning and fastening direction  Defining a coordinate system  The z-axis is the main assembly direction from top to bottom Change in positioning direction (= change of coordinate axis) and in fastening direction (change in direction on the same coordinate axis)
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Restricted space
The restricted space requires additional motions and/or results in delays for the positioning.
Example: |
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Aligning basic or positioning part
The part to be positioned or the basic part has to be turned around the positioning axis. As a result, the joining cross-sections will be congruent.
Example: |
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Measure and/or check per criterion
Definition: |
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Measure and/or check per criterion describes measurements or inspections of quality characteristics resulting from the design. |
Explanation:
The measurement or inspection is done by using cameras, scanners, sensors, actuators, etc.
Example: |
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▪Tolerances ▪correct position ▪correct part |
Rule A-M1:
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If before, during or after positioning, design-caused measurements or inspections are required, they have to be evaluated with the relevant frequency. |
Readjustment
Definition: |
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Readjustment refers to design-caused processes that must be performed prior to completing subsequent activities. |
Explanation:
Readjustment can be necessary as an independent activity for aligning or adjusting processes.
Rule A-J1:
Definition: |
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If after positioning, design-caused adjustments are required, they have to be evaluated with the relevant frequency. |
Rule A-J2:
Definition: |
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Required measurements or inspections are not considered in the value and have to be analyzed separately. |
Flexible part
Definition: |
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Flexible part describes a component to be positioned, that is not dimensionally stable and requires appropriate support when being positioned. |
Additional securing while positioning
Definition: |
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Additional securing while positioning describes a basic part and/or component, that has to be secured additionally during positioning. |
Explanation:
Additional securing while positioning is required, if huge forces occur or if the component hasn’t been finally fixed yet.
Without positioning aids
Definition: |
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Without positioning aids refers to an assembly process in which neither the component or sub-assembly, nor the positioning location, is equipped with positioning aids, such as bevels, pivots, stops etc. |
Explanation:
Missing positioning aids inevitably result in assembly interferences.
Example: |
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 w/o positioning aid  with positioning aid |