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Victor Santos Oliveira
91638cb1f3
* claim: #5237 command-level guide follow-up * docs: add practical command guides and resource contributions (#5237) * docs: index practical guides and reject incomplete command links
54 lines
2.4 KiB
Markdown
54 lines
2.4 KiB
Markdown
Fold a sheet metal edge back through a half turn to form a return. Use a hem
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when you need a doubled-over edge, rather than an upright wall.
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#### Before you start
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- You need an existing **sheet metal body** and a supported free sheet edge.
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Make a base flange or convert a suitable solid plate first.
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- Select the **edge**, not a sketch line, face or point. Hem does not require
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a new sketch. A bend along a line inside the sheet uses Fold instead.
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- Leave room for the return so it does not run into another wall or return.
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#### Options
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| Choice | Meaning |
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| --- | --- |
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| Edges | The sheet edges to turn back. Check that the preview changes the intended edge. |
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| Length | The return's length, measured to its outer face. It is not the thickness of the sheet. |
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| Gap | Controls the inner radius of the return bend. Leave it empty to use the sheet rule's hem setting. |
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| Flip | Turns the return toward the other side of the sheet. |
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#### Try it: a returned edge
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1. Create an **80 × 50 mm** base flange in **1.5 mm** sheet.
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2. Choose **Hem** and select a free 80 mm edge of the sheet.
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3. Set **Length** to **8 mm** and **Gap** to **1.5 mm**.
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4. Check which side receives the return; use **Flip** if necessary, then confirm.
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5. Inspect **Create Flat Pattern** to see the material needed for the bend.
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#### Tips and common mistakes
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- **Do** check the bend in the preview: an edge returning toward another feature
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needs enough clearance.
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- **Don't** draw a sketch line to tell Hem where to bend. Its input is an
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existing sheet edge; use Fold for a bend line through a panel.
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- **Don't** use Hem for an ordinary right-angle wall. That is an edge Flange.
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#### Examples and community resources
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| Resource | What to explore | Author and licence |
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| --- | --- | --- |
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| [Editable hem demo](https://github.com/tangency-labs/solidcraft/blob/main/docs/book/scripts/hem.json) | The sheet rule, base flange and 8 mm return used in this illustration. | SolidCraft contributors; MIT OR Apache-2.0. |
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[Contribute a tip, demo, model or screenshot](../dev/command-guides.md), explaining
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the selected edge and dimensions.
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#### See also
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{{#command sheet.flange}} makes a base sheet or an angled wall.
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{{#command sheet.fold}} bends along a line in the sheet.
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{{#command sheet.manage_rules}} sets the default hem gap.
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{{#command sheet.flat_pattern}} shows the developed part and bend lines.
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