TiCon ProKon > Analysis Criteria ProKon E > Change in Positioning / Fastening Direction

Change in Positioning/ Fastening Direction

Definition:
Change in positioning direction becomes necessary, within a positioning process, if a component or sub-assembly has to be positioned in more than one direction along a defined positioning axis. 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.

Definition:

Change in positioning direction becomes necessary, within a positioning process, if a component or sub-assembly has to be positioned in more than one direction along a defined positioning axis.

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 for the positioning direction in order to illustrate the defined positioning axis and positioning or fastening directions. If a component needs to be rotated or turned for further assembly, this is evaluated by changing the positioning or fastening direction.

Rule M-R1:

Definition:
In case of a change of the coordinate axis back to the specified main assembly direction, this is not evaluated.

Example:

Example 1: Changing of positioning and fastening direction

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)

	Change in axis	Change in direction
z-axis
4 bolts (assembly position)	0	0
from z-axis to y-axis
2 bolts (left side)	1	0
Change in direction on y-axis
2 bolts (right side)	0	1
from y-axis to x-axis
1 bolt	1	0

Example:
Example 2: Assemble a switch cover to an oven with 3 bolts in a defined assembly order. In order to fasten the 1st bolt, a change of the axis (X -> Y), and for the 2nd bolt, a change in positioning direction (+Y -> -Y) has to be evaluated.

Example:

Example 2: Assemble a switch cover to an oven with 3 bolts in a defined assembly order.

In order to fasten the 1st bolt, a change of the axis (X -> Y), and for the 2nd bolt, a change in positioning direction (+Y -> -Y) has to be evaluated.

Please note:
A change in the joining or fastening direction may result in an unfavorable position of the wrist, elbow, and/or shoulder joint. The assembly difficulty is therefore taken into account in the ergonomic risk evaluation for the upper limbs.