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Manual

Manual

9.5.1.7.3. Positioning - Example

To the orientation of connection points in PARTdesigner and thus, consequently, to the settings concerning positioning (Rotation/Translation with Min-Max values) should be payed particular attention, in order to simplify the creation of an assembly as much as possible and to avoid possible problems in CAD systems.

Example:

The following exemplary figure shows a lever with a start position of 0°. The lever can be rotated from -90° to +90°.

Lever with start position 0° and rotation range from -90° to +90°

Lever with start position 0° and rotation range from -90° to +90°

Problem

The standard approach results in a wrong start position (default position) of the movable component.

Target Correction of start position
Solution a)

Manipulation in Configurator, in dialog Rule properties

Solution b)

Adjustment of orientation of connection point inside of Sketch

[Note] Note

Solution b) is absolutely the preferred one.

The following example shows the problematic situation using the standard approach (solution a):

Initial situation in Variable Manager with value range dialog in the Table.

Variable Manager: Definition of rotation - start value 0° and value range from -90° to +90°

Variable Manager: Definition of rotation - start value 0° and value range from -90° to +90°

Initial situation in Sketch: The connection point at the movable part has been set with an angle of 0° by default.

Setting in dialog "Rule properties"

After Rotation and Min-Max values have been set by default, the start position of the lever is wrong (lever showing to the top is the desired position).

[Note] Note

All settings in the dialog box Rule properties are based on the orientation of connection point. So this demonstrates that standard settings do not always lead to desired results.

Default return value of "PARTDUMMY@ROTATION" is 0°

Default return value of "PARTDUMMY@ROTATION" is 0°

A quick solution would be a correction with a rotation value of "-90".

-90+PARTDUMMY@ROTATION

[Note] Note

However, a negative value for the manipulation should not be used in any case in order to avoid problems in CAD.

A possible, alternative approach looks like this:

270-PARTDUMMY@ROTATION

This however, requires an adjustment of Min-Max values. Since PARTDUMMY@ROTATION can take values from -90 to +90 , this results in Min-Max values of 180 and 360.

Min = 270-90 = 180
Max = 270+90 = 360

Correct setting of rotation and Min-Max values

Correct setting of rotation and Min-Max values

Solution b)

Much simpler and without the risk of erroneous settings is solution b).

Correct the angle of connection point (here in this example to the value of 90).

Now you receive the desired start position of lever with standard settings in the dialog box Rule properties.

[Note] Note

All explanations in this example also apply for Translation.