Sheet Metal Loft

To create a sheet metal loft:

1. While in a Part Studio, click the Sheet metal loft button ().

   

2. Select New to create a new sheet metal part, or select Add to add the loft to an existing one.
3. With focus in the Profile 1 field, select the starting profile (region, face, edge, or point).
   
4. With focus in the Profile 2 field, select the ending profile. Onshape creates a sheet metal model between the two profiles.

   

5. Click the Connections checkbox for more control on the twist of the resulting model. Onshape estimates the proximity within the existing vertices/edges if no matches are specified.
   1. Select a vertex or edge from the loft and drag the manipulator(s) to adjust the connection.

      

   2. To divide the model into separate parts at the connection, select Rip.
6. Use the Chordal tolerance field to set the maximum distance the tessellated geometry can vary from the underlying surface.
7. When creating new sheet metal models, you can also expand the following sections to further refine the model:
   • General:
     • Thickness - Thickness of the sheet metal. Click the arrow to reverse the direction.
     • Bend radius - Inside radius of the bends created.
     • Flip direction up - Select to reverse the orientation of the sheet metal model and flat view. This is useful when defining whether bends are up or down relative to the model.
   • Material (options in this section are identical to those provided in the Sheet metal model feature):
     • Bend calculation - Determines how the bends are calculated. Options are:
       • K Factor (default) - Uses the ratio of the neutral axis to the material thickness.
       • Bend allowance - Uses the length of the neutral line arc between the tangent points of a bend.
       • Bend deduction - Uses the difference between the sum of the flange lengths (from the edge to the apex) and the initial flat length.

         The Bend calculation selected here is used as a column in the sheet metal table. Each bend may be customized and directly edited from the table. See Sheet metal table and flat view for more information.

     • Default bend K Factor - The fraction of material thickness on which the neutral axis lies on a bend. (Default is 0.45.)
     • Rolled K Factor - The fraction of material thickness on which the neutral axis lies on a section of rolled wall. (Default is 0.5.)
   • Relief (options in this section are identical to those provided in the Sheet metal model feature):
     • Minimal gap - The smallest gap between the sheet metal edges defining a rip.
     • Corner relief type -
       • Square - Sized

         Flat view: 3D view:

       • Rectangle - Scaled

         Flat view: 3D view:

       • Round - Sized

         Flat view: 3D view:

       • Round - Scaled

         Flat view: 3D view:

       • Closed

         Flat view: 3D view:

       • Simple

         Flat view: 3D view:

     • Corner relief scale - The scale of the corner opening (for Scaled openings), a value between 1.00 and 2.00.
     • Bend relief type - The shape of the bend relief:
       • Rectangle - Scaled

         

       • Obround - Scaled

         

       • Tear

         

     • Bend relief depth scale - A value between 1.00 and 5.00. Once you enter a value it becomes the default across all documents.
       • A value of 1 results in an obround bend relief perfectly touching the bend and a rectangular bend relief matches the depth of the obround.
       • Any value past 1 adds depth via the formula:
         (depth scale -1) * bendRadius
     • Bend relief width scale - A value between 0.0625 and 2.00. Once you enter a value, it becomes the default across all documents. The width of the bend relief is calculated via the formula:
       thickness * width scale.
8. When adding to an existing sheet metal model, click the Merge scope field, then select the part to add to. The merge scope can only accept bodies of a single active sheet metal model.

When a sheet metal model is active (in the process of being created or edited), additional tools are available:

• 凸緣 - 為每條所選的邊線建立牆面，使用彎折來連接所選的邊線。
• 摺邊 - 在現有的鈑金零件上為所選取的邊線/面建立摺邊。
• 薄板頁 - 將一個薄板頁加入至鈑金凸緣中。
• Bend - Bend a sheet metal model along a reference line, with additional bend control options.
• Form - Create form features on existing sheet metal models. Forms can be selected from the current document, other documents, or a predefined library of sheet metal forms.
• Loft - Create sheet metal models that connect two profiles.
• 製作接合 - 將兩個牆面的相交處轉換為一個接合特徵，可以是一個彎折 (以圓柱幾何接合牆面)，或是一個裂口 (兩個牆之間的小間隙)。
• 轉角 - 修改轉角類型與止裂比例。
• 彎折止裂 - 修改彎折止裂 (在彎折結束與自由邊線交會處做出的小切除)、深度與止裂寬度。
• Modify joint - Make changes to an existing joint, such as converting a bend to a rip. Currently available through the flat view table.
• Corner break - Break the corner on existing sheet metal parts by applying a fillet or chamfer. Select a corner edge or vertex and specify corner break type and distance. It is recommended to use this feature after all flanges and joints of the Sheet metal model are finalized.
• Sheet metal table and flat view - Open and close the Rip/Bend tables and the visualization of the sheet metal model flat pattern. Use this table to convert rips to bends and vice versa.
• 完成鈑金模型 - 關閉 (停用) 鈑金模型；建立特徵清單中的特徵。

When a sheet metal model is active (in the process of being created or edited), additional tools are available:

• 凸緣 - 為每條所選的邊線建立牆面，使用彎折來連接所選的邊線。
• 薄板頁 - 將一個薄板頁加入至鈑金凸緣中。
• 製作接合 - 將兩個牆面的相交處轉換為一個接合特徵，可以是一個彎折 (以圓柱幾何接合牆面)，或是一個裂口 (兩個牆之間的小間隙)。
• 轉角 - 修改轉角類型與止裂比例。
• 彎折止裂 - 修改彎折止裂 (在彎折結束與自由邊線交會處做出的小切除)、深度與止裂寬度。
• Loft - View and modify sheet metal models that connect two profiles.
• Corner break - Break the corner on existing sheet metal parts by applying a fillet or chamfer. Select a corner edge or vertex and specify corner break type and distance. It is recommended to use this feature after all flanges and joints of the Sheet metal model are finalized.
• 完成鈑金模型 - 關閉 (停用) 鈑金模型；建立特徵清單中的特徵。