Matching Options

The process of matching an object to its match sources may mean the target object's position and section sizes are adjusted. This is entirely controlled by the selected match options during the Matching process .

See also: What is Matching?

Having selected the match source objects in the Match command dialog the following options must also be selected:

The displacement is the adjustment of the target object's center line position perpendicular to the common plane of the target and source objects center lines. The following show an assymetric intersection when displacement would be required to achieve an intersection on two matching edges (as would definitely be required if this is a bend intersection).

Fig: Before Matching

Offset Displacement

The following shows the target object adjusted to form the match using the 'Offset' displacement option and the 'Taper' section option. The center line has been translated downwards in the view to achieve the intersection so that both edges meet, but the orientation of the center line remain the same. The connecting end of the cone has also had its section size adjusted to taper the cone to achieve the matching edges.

Fig: After Offset Taper Matching

Turn Displacement

The following shows the same design adjusted to form the match using the 'Turn' displacement option and the 'Taper' section option. The center line of the target object has been turned downwards in the view to achieve the intersection so that again both edges meet. The connecting end of the cone has again had its section size adjusted to taper the cone to achieve the matching edges. Of course this kind of matching means that the center line orientation is changed and the face direction of other end of the target part is changed.

Fig: After Turn Taper Matching

Oblique Displacement

The third type of displacement possible is 'Oblique' displacement. This time the oblique skewing of the target object is adjusted to achieve the intersection so that again both edges meet. The connecting end of the cone has again had its section size adjusted to taper the cone to achieve the matching edges. This kind of matching means that the center line orientation is changed but the face position and direction of other end of the target part is not changed.

Fig: After Oblique Taper Matching

None Displacement

A further displacement option is 'None'. This prevents any kind of center line displacement or reorientation. In this case the taper matching will still occur so the section size is still adjusted but it can only achieve the match at one of the matching edges.

The 'Taper' section adjustment is illustrated in the 'Displace' section above. The other section match options are relatively easy to understand.

The 'Grow' option simply increases the section sizes at both ends by the same amount, thus keeping the object taper the same.

The section adjustment also has the 'None' option preventing any section adjustment. Off course this will prevent a the match option from achieving a valid intersection for bends but is useful for preventing adjustment with tee intersections when not-required. If the displacement option is set and the section option is set to 'None' then the center line will be adjusted to centralise the object such that had the section been allowed to adjust it would have achieved the match.

In cases where the target object is matched to more than one match source it is said to be 'Bridge Matched'.

In a bridge match case the section option is always treated as a taper because both ends have to be matched (although it may be two points along the object rather than the ends) so the taper of the object must be allowed to change. Only the 'None' option will prevent section change but the match will not then be achieved.

The center line adjustment cannot be 'Offset' because again both ends may require displacement to achieve the match, so it must use either the 'Turn' or 'Oblique (skew) option to achieve the match. Only 'None' will prevent it.