Change in positioning axis or direction
Change in Positioning/ Fastening 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 positioning direction becomes necessary, if a component or sub-assembly has to be positioned in more than one direction along a defined positioning axis.
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.
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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.
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Defining a coordinate system
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Change in positioning direction
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Example:
Changing of positioning and fastening direction
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Defining a coordinate system
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The z-axis is the main assembly direction from top to bottom
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Change in positioning direction (= change of coordinate axis) and in fastening direction (change in direction on the same coordinate axis)
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Change in axis
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Change in direction
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z-axis
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4 bolts (assembly position)
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0
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0
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from z-axis to y-axis
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2 bolts (left side)
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1
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0
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change in direction on y-axis
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2 bolts (right side)
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0
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1
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from y-axis to x-axis
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1 bolt
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1
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0
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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
Measure and/or check per criterion
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Measure and/or check per criterion describes measurements or inspections of quality characteristics resulting from the design.
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Explanation
The measurement or inspection is done by using cameras, scanners, sensors, actuators, etc.
Examples:
•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.
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Readjustment
Readjustment
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Readjustment refers to design-caused processes that must be performed prior to completing subsequent activities.
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Explanation
Readjustment can be necessary as an independent activity for aligning or adjusting processes.
Rule A-J1:
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If after positioning, design-caused adjustments are required, they have to be evaluated with the relevant frequency.
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Rule A-J2:
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Required measurements or inspections are not considered in the value and have to be analyzed separately.
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Flexible part
Flexible part
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Flexible part describes a component to be positioned, that is not dimensionally stable and requires appropriate support when being positioned.
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Additional securing while positioning
Additional securing while positioning
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Additional securing while positioning describes a basic part and/or component, that has to be secured additionally during positioning.
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Explanation
Additional securing while positioning is required, if huge forces occur or if the component hasn’t been finally fixed yet.
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Without positioning aids
Without positioning aids
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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.
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Explanation
Missing positioning aids inevitably result in assembly interferences.
Examples:
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Without positioning aid
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with positioning aid
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