See Add Pattern FB
If you use regular CAD, you will know about circular and linear arrays. In MechDesigner, there is more complexity because parts have complex motions.
A Pattern FB makes Copies of Profile/Extrusions and CAD-Solids - see Solids,
The Pattern FB anticipates the motion of each Copy and puts each Copy at a different phase of the machine-cycle.
The Pattern FB can show or hide each Copy for the machine-cycle.
The Pattern FB can show or hide each Copy as it passes through different phases of the machine-cycle.
Use Visibility toolbar > Show Solids in Mechanisms to see the Copies of the Solids that are generated by the Pattern FB.
Open the Pattern FB:
The Pattern Elements dialog-box is now open.
There are two tabs in the Pattern dialog-box:
Solid elements from which we make copies for the Space Pattern or Phase Pattern.
There are two categories of Solid elements you can add as Pattern Elements:
•MD-Solids - Profile/Extrusions - you MUST select the Extrusion
•CAD-Solids - Solids you import onto a CAD-Line - you can select the CAD-Solid or the CAD-Line.
Motion to Linearize
It is intended that a Motion FB will linearize the motion of the Solids in a Pattern-Elements. Experiment!
•If the Solids in the Pattern-Elements move as you expect, do not add a Motion FB.
•If the Solids in the Pattern-Elements do not move as you expect, do add a Motion FB - but this may not solve the problem!
Add SOLIDS to the Pattern-Elements box
Solid elements are now in the Pattern Elements box as Extrusions and/or CAD-Lines.
To add a Motion FB to Motion to Linearize box
A Motion FB is now in the Motions to Linearize box
To remove a Solid or Motion FB
To help you understand what the Phase-Visibilities can do, it is helpful to think of a chain around a circular 12-hour clock. The chain moves continuously around the clock. One of the chain-links is the Source Pattern-Element (Solid).
•Use PHASES to decide how many chain-links you want in the chain - called # Copies
•Use PHASES to hide one or more chain-links (the Copies) permanently, all the way around the clock.
•Use Pattern Visibility to hide chain-links (one link after the next link) only as they move between hours e.g.: 6 and 9 o'clock
Phases are copies of Pattern-Elements.
# Copies: from 1 to 100 : The number of copies of the Pattern-Elements to be in the Pattern
The format of the Phases separator is slightly different for the Space Pattern and the Phase Pattern.
IF Space Pattern:
Start Angle, Final Angle:
•The Copies show at equal intervals from the Start Angle to the Final Angle.
•The Phase Visibility separator does not show.
IF Phase Pattern:
The concept of a Motion-Period becomes important.
e.g. 1: If Final Angle is 360, then the Motion-Period is equal to 1 Machine-Cycle
e.g. 2: If Final Angle is 20º, the Motion-Period is 20º.
•The # Copies show at regular intervals within one Motion-Period, from Home Angle (MMA=0) to Final Angle.
•The Phase Pattern repeats one time for each Motion-Period or 36 ∕ 20 = 18 times in 1 Machine-Cycle
•You can show or hide each copy within each Motion-Period - see Phase Visibility separator.
Hide Source Pattern Element:
Source Pattern Elements are those Solids that are you select in the model as Pattern-Elements , and show in the Pattern Elements separator of the Pattern-Elements tab.
Nearly always, hide the source Pattern-Element. This is because the source Pattern-Element and the first copy (at 0°) are at the same position. It can be become confusing if you intend to hide the Copy (at 0°) but the Source Pattern-Element remains in the model.
It should show in the Phase-Visibilities
2.Click the Hide Source Pattern Element check-box
•To hide a copy for the Motion-Period, click a to show a .
•To show a copy for the Motion-Period, click the to show a .
Phase-Visibilities > Pattern-Visvibility
We use Pattern Visibility to show or hide a Pattern-Element for different periods within the Motion-Period.
To edit the Visibility of a Pattern-Element:
The Pattern Visibility interface is now open.
You can now edit the Visibility of the element that is in the Pattern-Element to Edit box
Refer to the image below:
Pattern-Element box (top-left)- Identifies the Pattern-Element you are editing.
Phase Visibility Timing Chart - this chart controls the Visible-Period of the Pattern-Element (Solid) in the Motion-Period.
As an example, we will edit the Visibility Chart:
In the image below, the chart is High from 0º to 360º. This means the Visible-Period for the Pattern-Element is a complete motion-period.
There are two(2) Nodes that identify and specify the timing of each Visible-Period in the chart.
•Node at the Start - Start-Node
•Node at the End - End-Node
To edit a Visible-Period for the Pattern-Element we must edit the timing of the Start-Node and/or End-Node.
STEP 1.(Example) Edit the Start-Node and End-Node to define a Visible-Period.
The image below shows the new timing of the Visible-Period for the Pattern-Element (Extrusion).
It starts at 50 and end at 150 in the Machine-Cycle.
STEP 2.(Example continued...) Add a new Visible-Period
There is now a new Visible-Period in the Phase-Visibility Chart - see image below.
STEP 3.Edit the Start-Node and End-Node to define the timing of the new Visible-Period.
The image below shows two Visible-Periods for the Pattern-Element (Extrusion)
Visible Period - Starts at 50 and ends at 150
Visible-Period - Starts at 200 and ends at 300
STEP 4.(Example continued...) Delete a Visible-Period
The image below shows one Visible-Period for the Pattern-Element (Extrusion)
You can now Click to close the Pattern Visibility interface.