Draft Angle result

The Draft Angle result displays draft variations for the part.

As injection molded parts cool and shrink, they tend to shrink more on cores or male forms in the mold. This makes ejection difficult if draft is not included in the design.

The mold surface roughness or texture, the part complexity, the depth of the part to be ejected, and the material properties are factors that influence the selection of draft angles. For example, a draft angle of 1.5 degrees allows an easy ejection of most smooth surfaces, but draft angles of 4 degrees and up to 8 degrees may be required for heavy leather textures.

Using this result

The Draft angle result displays draft variations expressed in degrees based on the XY plane as the parting plane. If the part is not oriented correctly relative to the XY plane, the draft angle result will be incorrect.

The angle tolerances are displayed as color bands.

• The color blue represents surfaces that are parallel to the parting plane (XY plane).
• The color red represents surfaces with zero draft.
• Four colors (yellow, green, turquoise, and cyan) are used to represent various ranges of draft angles.

Theses tolerances can be modified. For example, if the minimum acceptable draft in the part should be 1.5 degrees, the minimum tolerance can be changed from 0.5 degrees to 1.5 degrees, and the others increased as well, to 2.5 degrees, and 4 degrees, depending on what is appropriate for the situation. By doing this, all angles that are too small are shown in one color.

By default, angle tolerances are defined as follows:

• > 3.0° (cyan)
• < 3.0° (turquoise)
• < 1.0° (green)
• < 0.5° (yellow)

Note: The top value represents an angle equal or greater than the second value in the list, and is not editable. Other values should appear in descending order.

Things to look for

Although many factors should be taken into account before assuming that a draft angle is correct or not, a draft angle in the range of 0.5 degrees to 3.0 degrees is generally considered acceptable. Material manufactures may have specific draft angle guidelines for their materials and applications. This result can be used to compare the part to those specifications.

Use the Examine results tool to display the actual draft angle value for the selected area.