Draft Analysis

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Draft Analysis

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If you're designing a product that will be manufactured using injection molding, use the Draft Analysis Icon Draft Analysis tool to analyze the draft angle and detect undercuts. This allows you to verify whether the product will be easily removed from the mold, or if you will need to correct the draft and use injection mold sliders to facilitate mold release.

Draft Analysis Undercut Analysis

 

helpNote-35 What is a draft angle? When designing a product to be injection molded, the sides of the object should not be parallel to the pull direction (the direction in which the mold is pulled away from the object). Instead, they need to be angled slightly so that the mold can be pulled away from the object easily, without deformation or damage. This slight angle is called draft. The deeper the mold, the more draft needed.

helpNote-35 What is an undercut? An indentation or protrusion that could prevent the object from being ejected directly from a one-piece mold. Undercuts may require sliders, which are extra parts of the mold that move separately from the two halves.

 

 

hmtoggle_plus1To analyze the draft of a design:
1.Select the object(s) you want to analyze.
2.To perform a draft analysis, click the Draft Analysis Icon Draft Analysis icon or choose the Tools > Analyze > Draft Analysis menu command.
It is assumed that the mold will be pulled along the Z axis. You can change the Pull Direction in the Control Panel, or click and drag the Direction and Origin handles in the modeling views.
By default, an angle of 1° is considered sufficient draft. To use a different tolerance value, modify the Draft Angle.
By default, an angle of 0° is considered insufficient draft. To use a different tolerance value, modify the Warning Angle.
Green indicates a region where sufficient draft has been detected, in the same direction as the current pull direction. You can change the legend color using the Positive Draft parameter.
Yellow indicates a region where insufficient draft has been detected; you'll need to correct the draft of this region. You can change the legend color using the Requires Draft parameter.
Red indicates a region where sufficient draft has been detected, in the opposite direction of the current pull direction. You can change the legend color using the Negative Draft parameter.

Any modifications to the Draft Regions settings are automatically saved by Evolve for future use. Use the Reset button to restore the default settings.

 

 

hmtoggle_plus1To detect undercuts:
1.Select the object(s) you want to analyze.
2.To perform an an undercut analysis, hold the Ctrl key as you select the Draft Analysis tool, or select Undercut Analysis under Analysis Type in the Control Panel.
Orange indicates a region where undercuts have been detected; you may need to use sliders to facilitate ejection in these regions. You can change the legend color using the Occlusion region parameter.
The number of (Partially) occluded faces is displayed in the Control Panel.

 

Parameters

 

Pull Direction

Use to define the pull direction.

X Axis: If the object is aligned with the world coordinate system, the mold will be pulled away from the right side of the object.

Y Axis: If the object is aligned with the world coordinate system, the mold will be pulled away from the back side of the object.

Z Axis: If the object is aligned with the world coordinate system, the mold will be pulled away from the top side of the object.

Custom: Allows you to define an alternative pull direction by clicking and dragging the Direction and Origin handles in the modeling views.

Invert Direction: Use to invert the pull direction. For example, if the object is aligned with the world coordinate system, select Z Axis and Invert Direction to indicate that the mold will be pulled away from the bottom side of the object.

 

Analysis Type

Draft Analysis: Use to analyze the draft angle.

Undercut Analysis: Use to detect undercuts.

 

Draft Regions

Use to change the legend colors and define the tolerance values for sufficient and insufficient draft.

Positive Draft: Refers to a region where sufficient draft has been detected, in the same direction as the current pull direction. By default, these regions appear green, but you can change the legend color using the color palette.

Draft Angle (°): Use to define the tolerance value for sufficient draft. The default value is 1°. Select a value that is greater than or equal to 0°; it must also be greater than or equal to the Warning Angle.

Requires Draft: Refers to a region where insufficient draft has been detected. By default, these regions appear yellow, but you can change the color using the color palette.

Warning Angle (°): Use to define the tolerance value for insufficient draft. The default value is 0°. It must be less than or equal to the Draft Angle.

Negative Draft: Refers to a region where sufficient draft has been detected, in the direction opposite to the current pull direction. By default, these regions appear red, but you can change the color using the color palette.

 

Undercut Analysis

(Partially) occluded faces: Lists the number of faces that are partially or fully occluded (not visible from above or below the parting line).

Occlusion region: Refers to a region where occlusion has been detected. By default, these regions appear orange, but you can change the color using the color palette.

 

Reset

Any modifications to the Draft Regions or Undercut Analysis settings are automatically saved by Evolve for future use. Use the Reset button to restore the default settings.