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To Create a Draft or Shell
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You can create a fixed edge or fixed plane face draft, a parting line face draft, or a shell. The Draft feature applies a taper to part faces to cant a surface or allow a part to be extracted from a mold. Draft is defined by specified faces, pull direction, angle, and fixed edge or tangent surface. You can create three types of drafts in Inventor: Fixed Edge, Fixed Plane, or Parting Line. To begin, create a 3D part with faces or edges to draft. Create a Fixed Edge or Fixed Plane Face DraftThe following steps detail using the Fixed Edge and Fixed Plane options in the draft command. The third option, Parting Line, is detailed in the next section. Click 3D Model tab Modify panel Draft  .
In the Face Draft dialog box, select one of the following the draft types:
Fixed Edge  . Creates draft about one or multiple tangent contiguous fixed edges per face. Result creates more faces.
Fixed Plane  . Creates draft about a fixed plane. The planar part face or work plane determines which selected faces are drafted. Depending on the position of the fixed plane, the draft can both add and remove material.
In the following example, the fixed top face sets an upward pull direction. All side faces are drafted, adding material below the fixed plane.
In another example, a work plane is the fixed plane. Material is removed in the pull direction above the fixed plane and added below the fixed plane:
Define the pull direction: Move the cursor over a face, work plane, edge, or axis, until the direction arrow aligns with the appropriate pull direction. Then click to select.
Tip: To change the pull direction, click Flip Direction
 .
Select the faces to draft. As you move the cursor over a face, it highlights in one color, and the fixed edge, which is the intersection of the selected face and the fixed plane, highlights in a second color. To remove a face or edge from the selection set, press Ctrl + click.
Note: If a face is tangent to other faces, all tangent faces highlight. To select individual faces, disable Automatic Face Chain.
Specify values for the angle and the symmetry:
Draft Angle and Draft Angle 2. Sets the angle of the draft. Enter a positive or negative angle, or choose a calculation method from the list.
One Way  . Adds draft in a single direction. Available for fixed edge and fixed plane types.
Symmetric  . Adds draft above and below the plane or parting line. Uses the same angle value. Available for fixed plane and parting line draft types.
Asymmetric  . Adds draft above and below the plane or parting line. Uses a different angle value for the upper and lower draft. Available for fixed plane and parting line draft types.
To maintain adjacent blended features, such as fillets, select Automatic Blending. To stop the blended features from participating in the draft, turn off Automatic Blending.
Click OK.
Create a Parting Line Face Draft
The parting line face draft option lets you explicitly define which part of the model thickness to preserve. On the ribbon, click 3D Model tab Modify panel Draft .
Click the Parting Line draft type  .
Define the pull direction . Move the cursor over a face, work plane, edge, or axis, until the direction arrow aligns with the appropriate pull direction. Then click to select. If necessary, to change the pull direction, click Flip pull direction. Select the Parting Tool. The parting tool can be a sketch, plane, or surface. Select the faces to draft. As you move the cursor over a face, it highlights in one color, and the fixed edge highlights in a second color. To remove a face or edge from the selection set, press Ctrl + click. Note: If a face is tangent to other faces, all tangent faces highlight. To select individual faces, disable Automatic Face Chain. To maintain adjacent blended features, such as fillets, use Automatic Blending. To stop the blended features from participating in the draft, disable Automatic Blending. Enter the draft angle .Click OK to finish or follow the remaining steps to define static edges. Select the Move Parting line option in the dialog box.
If desired, enable the Static Edges selector and select the individual fixed edges or click Select Boundary to select multiple edges automatically. Click Clear All to remove all edges from the selection set. Enable one of the following options: Angle for Top Angle for Both Angle for Bottom Optionally, expand the dialog box and set the Draft Angle to Absolute or Relative. Click OK. Show Me How to Use Automatic Face Chain and Automatic Blending with Face Draft
Show Me How to Create a Fixed Plane Face Draft
Create a Shell The Shell feature removes material from a part interior, creating a hollow cavity with walls of a specified thickness. Selected faces can be removed to form a shell opening. Click 3D Model tab Modify panel Shell  .
Using the Remove Faces selector in the Shell tab of the Shell dialog box, select the faces to you want to remove in the graphics window. Part surfaces that are not selected for removal become shell walls.
To aid in your selection, turn Automatic Face Chain on or off.
If selected, Automatic Face Chain enables the automatic selection of multiple tangent continuous faces. It is selected by default. Clear the check box to allow individual tangent face selection.
If available in a multi-body part file, click Solids and choose the participating solids.
Specify the direction of the shell boundary relative to the part face:
Inside. Offsets the shell wall to the part interior. The external wall of the original part becomes the external wall of the shell.
Outside. Offsets the shell wall to the exterior of the part. The external wall of the original part is the internal wall of the shell.
Both Sides. Offsets the shell wall equal distances to the inside and outside the part. Adds half of the shell thickness to the thickness of the part.
Specify the shell’s Thickness. Thickness is applied uniformly to shell walls. To use the thickness value in a parameter table, highlight the value in the box, and then right-click to cut, copy, paste, or delete it. (Optional) To change the thickness of a specific shell face, click More , click a row in the Unique Face Thickness Table, select one or more faces, and enter a new value in the Thickness column. Continue to change face thickness, as needed.
Tip: To reset a shell face to its original thickness, delete the row.
(Optional) To change how approximate shelling solutions are computed, click the More tab, and select Allow Approximation. Then, select a deviation type and computation preference:
Allow Approximation. When no precise solution exists, allows a deviation from the specified thickness while computing the shell feature. A precise solution creates a shell where each point on the original surface has a corresponding point on the shell surface. The distance between these two points is the specified thickness.
Mean. Deviation is divided to fall both above and below the specified thickness.
Never Too Thin. Preserves minimum thickness. The deviation must fall above the specified thickness.
Never Too Thick. Preserves maximum thickness. The deviation must fall below the specified thickness.
Optimized. Computes using a tolerance that allows a minimal compute time.
Specify Tolerance. Computes using the specified tolerance. Considerable computation time can be required.
Click OK.
If an approximation is used, click OK in the message box to accept the results or Edit to return to the Shell dialog box More tab.
Show Me How to Create a Shell
Show Me How to Create a Shell With Unique Face Thicknesses
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