You can shrink part geometry by scaling it in relation to

coordinate system directions.

• You can apply shrinkage by scale

to all three directions uniformly.

– Isotropic

• You can apply different shrinkage

ratios to each of the three

coordinate system directions.

– X-Direction

– Y-Direction

– Z-Direction

Figure 2 – Isotropic Shrinkage

by Scale Applied

Applying Shrinkage by Scale

Figure 1 – Model Before

Shrinkage Applied

Figure 3 – Different Shrinkage

Ratios Applied to Different

Directions

The Shrinkage by Scale method enables you to shrink the part geometry

by scaling it in relation to a coordinate system. You can specify different

shrinkage ratios for the X, Y, and Z-coordinates. If you apply shrinkage

in Mold mode, it applies only to the reference model and does not affect

the design model.

Shrinkage by scale is applied by creating a new shrinkage feature. When

you apply shrinkage in Mold mode, the shrinkage feature is created in the

reference model, not in the design model, unless the Same Model option was

used when assembling the reference model into the mold model.

To apply shrinkage by scale, you must specify the following items:

• Coordinate System — Specify the model coordinate system that the

shrinkage feature uses as a reference. The X, Y, and Z-directions of

the coordinate system determine the X, Y, and Z-directions used for the

shrinkage ratio.

• Formula — Specify the formula you want to use to calculate shrinkage.

• Shrink Ratio — Specifies the ratio of shrinkage you want to apply.

The following options are available when applying shrinkage by scale:

• Isotropic — When enabled, sets the same shrinkage ratio for the X, Y, and

Z-directions. You can clear this check box to specify a different shrinkage

ratio for each of the three directions.

• Forward References — When enabled, the shrinkage does not create new

geometry but changes the existing geometry so that all existing references

continue to be part of the model. You can clear this check box to have

the system create new geometry for the part on which shrinkage is being

applied.

Considerations when Applying Shrinkage by Scale

When applying shrinkage by scale in Mold mode, keep the following in mind:

• A negative shrinkage ratio shrinks the dimension, while a positive shrinkage

ratio expands it. For example, a positive 0.02 shrinkage ratio applied with

the 1+S formula expands all the model dimensions by 2 percent, while a

negative 0.02 shrinkage ratio shrinks all the model dimensions by 2 percent.

• It is never reflected in the design model, unless the design model is the

reference model.

• If it is applied to the design model in Part mode, then the shrinkage feature

belongs to the design model, not to the reference model. Shrinkage is

accurately reflected by the reference model geometry, but it cannot be

cleared in Mold mode.

• It should be applied prior to the definition of parting surfaces or volumes.

• It affects part geometry (surfaces and edges) and datum features (including

curves, axes, planes, and points)