Pattern FB dialog-box

Pattern dialog-box

See Add Pattern

See How to open a dialog-box


Note-Pencil-20 You must toggle in Visibility toolbar > Show Model in Mechanism to see the Solid elements and its copies generated by the Pattern FB.

Icon-FB-Pattern

A Pattern element makes an array of one or more Solids

The Pattern is similar to a circular or linear array as found in your CAD. However, the Pattern element also anticipates where each Solid in the pattern will be at each instant in a machine cycle.

Edit the Pattern FB

Icon-FB-Pattern

Edit the Pattern FB:

1.Click the Pattern FB in the Assembly-Tree.

The Pattern FB element should be in the Selection-Window

2.Right-click the Pattern FB element in the Selection-Window
3.Click Edit element in the Contextual menu

- or -

The Pattern Elements dialog-box is now open.

Pattern dialog-box

Dialog-Pattern

There are two tabs in the Pattern dialog-box:

Pattern Elements
Phase Visibilities.

Pattern Elements tab

Enable and Type

Dialog-Patternt-PatternElementstab-Enable and Type

1.Click the Enable check box to make the Pattern element active.
2.Click: Space Pattern or Phase Pattern. Experiment!
Space Pattern - Note: I rarely use this option!
1.Take a 'snap-shot' of the path that the Pattern Elements will take in one Machine Cycle  [see Pattern Elements below]
2.Shows Pattern Solids hem at equal increments as given by the number-of-copies, along snap-shot of the path

When you cycle the model:

3.Each copy of the Solid remains fixed as given by the Snap-Shot, and all Pattern Solids move with the Part

- or -

Phase Pattern

The same as the Space Pattern, however:

1.When you cycle the machine, each copy of the Solid moves along the path it actually takes.
2.Each Solid is at an advanced position around the cycle.

Pattern Elements

Dialog-Patternt-PatternElementstab-Pattern Elements

Padlock icon.

You must click the Padlock, to 'unlock' it, before you can add or remove elements.


Pattern Elements.

There are two boxes.

A. Pattern Elements

These are the 'Source Pattern Elements. They include Solids that you want to Pattern.

Solids you can pattern include:

Imported Solids - SOLIDWORKS and STL files.

To add Solids to the 'Pattern Elements' box:

Click - in the Assembly-Tree or the graphic-area:

or

2.CAD-Lines onto which a Solid has been imported
B. Motion to Linearise

If the motion of the Solids is linear - when they move at constant velocity - then the Solids will show at equal positions. There is no need to select a Motion elements.

If the motion of the Solids is not linear, then Solids will 'bunch-up' at machine angles when the Solids move slowly, and they will 'stretch-out' when they move quickly.

Motion FBs you select will linearize the pattern's positions.

To add Motion FB to the 'Motions to Linearize' box:

1.Click a Motion FB in the Assembly-Tree or the graphic-area.

To remove elements from the boxes.

1.Click an element in the Pattern Elements or Motion to Linearize box
2.Click the 'Remove Solid' or the 'Remove Motion FB' icon at the top of the Pattern Elements separator.

The Padlock icon:

To make sure you do not add more Solids or Motion FBs while you edit your model:

1.Click the Padlock, to lock it

Phase Visibilities tab

Phases

Dialog-Pattern-PhaseVisibilities-Phases

The format of the Phases separator is different when you select Space Pattern to when you select Phase Pattern.

Copies:

The number-of-copies of the Pattern Elements to be displayed in the graphic-area.

IF Space Pattern

Start Angle, Final Angle:

The 'Copies' show at regular intervals from the Start Angle to the Final Angle.

The Start-Angle to Final-Angle is the Pattern Range.

The Phase Visibility separator does not show.

IF Phase Pattern:

The concept of a Motion-Period is important.

When the Final-Angle is, for example, 20º, the motion period is 20º.

Then the Phase Visibility repeats 36  ∕ 20 = 18 times.

Final Angle:

If the Final Angle is 360, then the Motion Period is 1 Machine Cycle

If

The 'Copies' show at regular intervals of the MMA. from Machine Home to the Final Angle.

Machine Home to the Final Angle is the Pattern Range.

The Phase Visibility separator shows, at the bottom of the dialog-box

Hide Source Pattern Element:

The source Pattern elements are the Solids that is in the Pattern Elements separator.

Click the check-box to hide the Solids that you have selected in the Pattern Elements separator.

Typically, you hide the source Solid. This is because a copy will show at the same position as the source Solid.

Copies Box

The box that shows the Pattern Copies and the Master Machine Angle at which each copy of the Solid will show in the graphic-area.

MD-show-hide copies pattern

This box gives angle, or phase, with reference to the Master Machine Angle, of each copy of the Pattern Element.

To hide a copy, for the complete machine cycle, click a tick16.
To show a copy, for the complete machine cycle, click a cross16.

Phase Visibility

Dialog-Pattern-PhaseVisibilities-PhaseVisibility

Phase Visibility shows only when you use the Phase Pattern check-box in the Enable and Type.

Show or hide individual Pattern Elements at one or more phases in the Pattern Range.

Think of a chain wrapped around a circular 12-hour clock and the chain moves continuously around the clock. You can hide each chain-link  as they move between 6 and 9 o'clock.

Compare with Copies Visibility: hide a Solid as it moves all the way around the clock

To edit the 'Phase Visibility' of a Solid:

1.Click a Solid in the Pattern Elements box.

The Solid element - 'Extrusion' or 'CAD-Line' must show in the Edit Pattern Element' box

2.Click the Edit Pattern Visibility...button

The Pattern Visibility dialog-box opens.

tog_minusPhase Visibility dialog

 

Click to Expand or Collpase
Edit Visibility of Pattern in Machine Cycle

 

Phase Visibility: to Show and Hide Solid Elements between different Machine Angles


Phase Visibility dialog

1s-red Visibility of Pattern Element
This identifies the CAD-Line or Solid you are editing in the Phase Visibility dialog.

2s Phase Visibility Chart
The chart can 'Switch' the visibility of the Pattern element [Solid] over a machine cycle.

The X–axis is Machine Period or Machine Angle : 0 – 360.

The Y–axis is 'High' to Show or 'Low' to Hide the Solid element in the graphic-area.

In the image: the chart is High from 0º to 90º and also from 190º to 270º.

3s Add or Remove a Show or Hide Switch.

To add a Switch:

1.Click the Switch icon
2.Click the Phase Visibility Chart2s

To remove a Switch:

1.Click a Node5s
2.Click the RemoveSwitch icon

The dialog removes the switch that needs the Node5s

You cannot remove all of the Phases.

To Edit a Node:

1.Click a Node5s
2.Edit the machine angle of the Node in the Switch Phase data box4s [Node Position].

Examples

tog_minusSpace Pattern - No Motion FB

Pattern-Space1

Build a model:

The Mechanism:  A 'Piggyback Slider' arrangement

Add 'Slider 1', Add 'Slider 2' to move on Slider 1', but moving in a perpendicular direction to 'Slider 1'.

The Motion:  Default motion (Rise-Dwell-Return-Dwell)

Advance the motion of the Slider 2 by 90º:
Edit the Linear Motion FB, and set it to 90º.

The path taken by the Origin of the Slider that moves along the X and the Y–axis should be a 'square'.

The Pattern element : a Solid:

Add a Profile/Extrusion at the Origin of Slider 2

Pattern-Space

1.Add a Pattern Element

It is in the Assembly-Tree.

2.Edit the Pattern Element
Double-click the Pattern Element in the Assembly-Tree to open the dialog-box.
3.Enable it and select 'Space Pattern'
4.Expand the Pattern Elements separator.
Click the Extrusion in the graphic-area so it shows in the Pattern Elements box
5.Expand the Phases separator
Set the Copies to 8.

There is a copy of the Source Extrusion every 45º of the Master Machine Angle, starting at 0º.

The motions for the Extrusion happens to produce a regular pattern for the Extrusion.

The model should be like the image to the left.

Pattern-Space2

6.Set the Copies to 6.
The model should be similar to the image to the left.

There is a copy every 60º of the Master Machine Angle, starting at 0º .

The copy shows at the position that the Extrusion would show at each angle (in the Copies List box) with reference to the Master Machine Angle.

7.Set the Copies to 8.
The model should be similar to the image to the left.

See Video to the Left.

Edit the Copies

1.Turn off one or many of the copies in the Pattern

See Video to the Left.

'Compress the Copies'

Edit the Start and End-Angles.

This changes the range of the Master Machine Angle over which the eight copies are distributed.


CASE 2/1: Space Pattern: Copies = 6, Start Angle = 0; End Angle = 360, Non-Linear Angular Velocity

CASE 2/1: Space Pattern: Copies = 6, Start Angle = 0; End Angle = 360, Non-Linear Angular Velocity

CONDITION 2/1: Part Moves with a Non-Linear-Motion - See Motion above

The Part rotates 360 in a Machine Cycle

Start Angle = 0; End Angle = 360;

Copies = 6


Example Instance: Look up the second instance of the Pattern.

X–axis = SA + (EA-SA ∕ 6*(2-1)= 60.

When the X– Axis is 60, the Y motion-value is 100.

This means the second instance after the start, is 100º.

CASE 2/1: Space Pattern: Copies = 6, Start Angle = 0; End Angle = 120, Non-Linear Angular Velocity

CASE 2/1: Space Pattern: Copies = 6, Start Angle = 0; End Angle = 120, Non-Linear Angular Velocity

CONDITION 1/2: Part Moves with a Linear-Motion - for example Constant Angular Velocity

The Part rotates 360 in a Machine Cycle

Start Angle = 0; End Angle = 120.

Copies = 6


Example Instance: Look up the fourth instance of the Pattern.

X–axis = SA + (EA-SA ∕ 6*(4-1)= 60.

When the X– Axis is 60, the Y motion-value is 100.

This means the fourth instance after the start, is also 100 degrees.

tog_minus        Phase Pattern - No Motion FB

Pattern-Space1

Build a model:

The Mechanism:  A 'Piggyback Slider' arrangement

Add 'Slider 1', Add 'Slider 2' to move on Slider 1', but moving in a perpendicular direction to 'Slider 1'.

The Motion:  Default motion (Rise-Dwell-Return-Dwell)

Advance the motion of the Slider 2 by 90º:
Edit the Linear Motion FB, and set it to 90º.

The path taken by the Origin of the Slider that moves along the X and the Y–axis should be a 'square'.

The Pattern element : a Solid:

Add a Profile/Extrusion at the Origin of Slider 2

Pattern-Space

1.Add a Pattern Element

It is in the Assembly-Tree.

2.Edit the Pattern Element
Double-click the Pattern Element in the Assembly-Tree to open the dialog-box.
3.Enable it and select 'Phase Pattern'
4.Expand the Pattern Elements separator.
Click the Extrusion in the graphic-area so it shows in the Pattern Elements box
5.Expand the Phases separator
Set the Copies to 8.

There is a copy of the Source Extrusion every 45º of the Master Machine Angle, starting at 0º.

The motions for the Extrusion happens to produce a regular pattern for the Extrusion.

The model should be like the image to the left.


See Video to the Left.


Edit the Copies

1.Turn off one or many of the copies in the Pattern

See Video to the Left.

 


'Compress the Copies'

Edit the Start and End-Angles.

This changes the range of the Master Machine Angle over which the eight copies are distributed.

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd