Dimensioning A Slot Pattern

Slots Slotted series of channels offer full flexibility. A variety of pre-punched slot patterns eliminate the need for precise field measuring for hole locations. Slots offer wide adjustments in the alignment and bolt sizing. Holes A variety of pre-punched 9/16” (14.3 mm) diameter hole patterns are available in our channels. . Circular hole patterns may be defined with polar coordinate dimensioning. When possible, dimension angles in degrees and decimal parts of degrees. Base dimensions at the mean of a tolerance because the computer numerical control (CNC) programmer normally splits a tolerance and works to the mean. While this is theoretically desirable. Slot antennas are used typically at frequencies between 300 MHz and 24 GHz. The slot antenna is popular because they can be cut out of whatever surface they are to be mounted on, and have radiation patterns that are roughly omnidirectional (similar to a linear wire antenna, as we'll see). The center-line tools are missing a 'center of slot' one-click option. Currently this takes 4 clicks, which would be a bummer if you have many slots to dim. 😂 If I were you, and found that style of dimension critical. I would create (2) improvement requests. One for the 'slot center marks' and one for the dimension callout. How do you go about dimensioning slots in drawings? In SW I would create the dimensions, edit the radius one to add SLOT at the begining and then select the length dimension to add it to the string. Then the dimensions were linked to the part and not just dumb text. I am not finding a simular functi.

Description

The polar pattern tool takes a selected feature and creates a set of copies rotated around a chosen axis. Starting with v0.17, it can pattern multiple features.

Above: a slot-shaped pocket (B) made on top of a base solid (A, also referred to as support) is used for a polar pattern. The result (C) is shown on the right.

Usage

To create a pattern:

1. Select the feature (introduced in version 0.19 or several features) to be patterned.
2. Press the PolarPattern button.
3. Define the Axis. See Options.
4. Define the Angle between the last copied occurrence and the original feature.
5. Set the number of Occurrences.
6. If you have several features in the pattern, their order can be important, see the image below. introduced in version 0.19 You can change the order by dragging the feature in the list and you will see the result immediately as preview.
7. Press OK.

Effect of the feature order

To add or remove features from an existing pattern:

1. Press Add feature to add a feature to be patterned. The feature must be visible in the 3D view:
   1. Switch to the Model tree;
   2. Select in the tree the feature to be added and press Spacebar to make it visible in the 3D view;
   3. Switch back to the Tasks panel;
   4. Select the feature in the 3D view; it will be added to the list.
   5. Repeat to add other features.
2. Press Remove feature to remove a feature from the list, or right-click on the feature in the list and select Remove.

Options

Axis

When creating a polar pattern feature, the PolarPattern parameters dialogue offers different ways of specifying the pattern rotation axis.

Normal sketch axis

An axis being normal to the sketch and starting in the origin of the sketch of the feature being used is taken as axis for the polar pattern.
The pattern direction can be reversed by ticking 'Reverse direction'.

Horizontal sketch axis

Uses the horizontal axis of the sketch for axis.

Vertical sketch axis

Uses the vertical axis of the sketch for axis.

Custom Sketch Axis

If the sketch which defines the feature to be patterned also contains a construction line (or lines), then the drop down list will contain one custom sketch axis for each construction line. The first construction line will be labelled Sketch axis 0.

Base (X/Y/Z) axis

v0.17 and above Select one of the Body Origin's standard axis (X, Y or Z) as axis.

Select reference...

Allows you to select either a DatumLine or an edge of an object or a line of a sketch to use for axis.

Angle and Occurrences

Specifies the angle to be covered by the pattern, and the total number of pattern shapes (including the original feature). For example, four occurrences in an angle of 180 degrees would give a spacing of 60 degrees between patterns. There is one exception: If the angle is 360 degrees, since first and last occurrence are identical, four occurrences will be spaced 90 degrees apart.

Limitations

• See linear pattern feature limitations.

• Structure tools:Std Part, Std Group
• Helper tools:Body, New sketch, Edit sketch, Map sketch

• Modeling tools
  • Datum tools:Create a datum point, Create a datum line, Create a datum plane, Create a local coordinate system, Create a shape binder, Create a clone
  • Additive tools:Pad, Revolution, Additive loft, Additive pipe, Additive box, Additive cone, Additive cylinder, Additive ellipsoid, Additive prism, Additive sphere, Additive torus, Additive wedge
  • Subtractive tools:Pocket, Hole, Groove, Subtractive loft, Subtractive pipe, Subtractive box, Subtractive cone, Subtractive cylinder, Subtractive ellipsoid, Subtractive prism, Subtractive sphere, Subtractive torus, ‎Subtractive wedge

• Transformation tools:Mirrored, Linear Pattern, Polar Pattern, Create MultiTransform
• Dress-up tools:Fillet, Chamfer, Draft, Thickness
• Boolean:Boolean operation

• Extras:Migrate, Shaft design wizard, Involute gear
• Contextual Menu tools:Set tip, Move object to other body, Move object after other object

• Installation:Download, Linux, Windows, MacOS, Docker, AppImage, Ubuntu Snap
• Basics:About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties; Help FreeCAD, Donate

• Help:Tutorials, Video tutorials
• Workbenches:Std Base; Arch, Draft, FEM, Image, Inspection, Mesh, OpenSCAD, Part, PartDesign, Path, Points, Raytracing, Reverse Engineering, Sketcher, Spreadsheet, Start, Surface, TechDraw, Test Framework, Web
• Unmaintained workbenches:Plot, Robot, Ship
• Deprecated workbenches:Complete, Drawing

Dimensioning A Slot Pattern Tool

• Code:Addon Manager, Addons, Macros, External workbenches

• Hubs:User hub, Power users hub, Developer hub

Dimensioning A Slot Pattern Blocks