SheetMetal AddWall

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SheetMetal Workbench

SheetMetal Bend
Menu location
SheetMetal → Add Bend
Workbenches
SheetMetal
Default shortcut
None
Introduced in version
-
See also
None

Description

The SheetMetal workbench Bend tool creates a bend on the selected edge.

Selected edge before bend

File:PreBend.png

Click Bend tool

Usage

To add a Bend:

1. Switch to the SheetMetal Workbench.
2. Start with a base plate or sheet, select one or more edges to receive a bend.
3. Click on the Bend tool to add a bend.

Properties

Data

Base

• DataLabel: User name of the object in the Tree view.

Parameters

• Dataradius: Bend radius.
• Datathickness: Thickness of bend (TrueTypically needs to match thickness of the sheet metal).

View

The parameter descriptions of the View tab will be found in Property editor, further below at Example of the properties of a PartDesign object.

Notes

• clearance: At a gear pair, clearance is the distance between the tooth tip of the first gear and the tooth root of the second gear.
• double_gear: To use the double helical gearing the helix angle β (beta) for the helical gearing must first be entered.
• module: Using ISO (International Organization for Standardization) guidelines, Module size is designated as the unit representing gear tooth-sizes. Module (m): m = 1 (p = 3.1416), m = 2 (p = 6.2832), m = 4 (p = 12.566). If you multiply Module by Pi, you can obtain Pitch (p). Pitch is the distance between corresponding points on adjacent teeth.
• shift: Profile shift is not merely used to prevent undercut. It can be used to adjust center distance between two gears. If a positive correction is applied, such as to prevent undercut in a pinion, the tooth thickness at top is thinner.
• teeth: If the number of teeth is changed, the pitch diameter also changes (dw).
• undercut: Undercut is used when the number of teeth of a gear is too small. Otherwise the mating gear will cut into the tooth root. The undercut not only weakens the tooth with a wasp-like waist, but also removes some of the useful involute adjacent to the base circle.
• pressure_parameter: 20° is a standard value here. The pressure angle is defined as the angle between the line-of-action (common tangent to the base circles) and a perpendicular to the line-of-centers. Thus, for standard gears, 14.5° pressure angle gears have base circles much nearer to the roots of teeth than 20° gears. It is for this reason that 14.5° gears encounter greater undercutting problems than 20° gears. Important. the pressure angle changes with a profile shift. Only change the parameter, if sufficient knowledge of the gear geometry is available.
• reversed_backslash: If there are several gears, pay attention to which gear the parameter is set for.

Limitations

Limitation are not known yet.

Scripting

Use the power of python to automate your gear modeling:

import FreeCAD as App
import freecad.gears.commands
gear = freecad.gears.commands.CreateInvoluteGear.create()
gear.teeth = 20
gear.beta = 20
gear.height = 10
gear.double_helix = True
App.ActiveDocument.recompute()
Gui.SendMsgToActiveView("ViewFit")

SheetMetal Workbench