This dialog-box shows the Element's Properties. The values are at the . You can move the model to any MMA while this dialog is open.
Elements that have Element Properties are:
|•||Wire, Part, Pin-Joint, Slide-Joint, 2D-Cam, Part-Outline, Line, Circle, Arc, Point, Gear-Pair, Function-Blocks...|
To open the Element Properties dialog-box:
In the graphic-area:
|1.|| above the element so that it becomes Red. Do not click the element. |
|2.||CTRL key down + Click the element |
The 'Element-Properties dialog is now open.
The two steps above are frequently described as one step: 'Hover+CTRL+Click'.
|•||If you Hover+CTRL+Click more than one element, the Element Properties dialog-box may not open.|
Element Properties dialog box for a Point
Element Properties dialog for a Point : see image above. [The properties for different elements are different.
In the image above, we looking at the 'Element's Properties of a Point'.
At the top of the dialog-box, you can see the
|•||Element's Name [Point19], |
|•||Element's Part [Part3], and |
|•||Element's Mechanism [Mechanism].|
In this case, we are looking at the Element Properties of 'Point19', which is a child to 'Part3', which is a child to 'Mechanism'
In the case of a Point, the properties are:
|•||'Part Pos': the Point's vector position within the coordinate-system of the Part.|
|•||'Mech Pos': the Point's vector position within the coordinate-system of the Mechanism-Editor.|
|•||'Glob Position': the Point's vector position within the coordinate-system of the Model-Editor.|
|o||i , j : the magnitude of the vector's Velocity and Acceleration , in the X and Y directions, respectively.|
|o|||n| : the total magnitude of the vector's Velocity and Acceleration|
|o||Θ : the direction of the vector's Velocity and Acceleration . ['0' is the X-axis direction of the Mechanism-Plane].|
'V' indicates they are 'vector' values.
The Trace-Point shows the path of a Point on the for a complete machine cycle.
Other terms for a Trace-Point are: 'locus', 'curve', and sometime a 'coupler curve'.
It is only possible to show a Trace-Point of a Point when the:
|•||Part is a , or as a Green Part-Outline.|
|•||Point actually moves relative to the Mechanism-Plane.|
You can show any number of Trace-Points.
To show a Trace-Point:
|1.||Click Add Trace-Point in the |
|2.||Click a Point that is a child to a Part in a kinematically-defined chain |
Do 1-3 again for other Points that belong to the same or different Parts.
Video : Add Trace-Point
NOTES: SELECT-ELEMENTS DIALOG-BOX
When there are coincident Points, the Select Elements dialog-box opens.
|1.||Click a Point in the Select Elements dialog-box |
|2.||Click OK to close the Select Elements dialog-box |
Do 1-3 again for other Points. Even in the same Part.
When the Points are in the same Part, or they are made coincident with a Pin-Joint, then the Point you select is not important.
To delete a Trace-Point
|1.||Click the Trace-Point in the graphic-area so that it becomes RED, and also shows in the |
|2.||Click the 'delete' button on your keyboard, |
- or -
|2.||Right-click the Point in the Selection-Window |
|3.||Click 'Delete' in the contextual menu|
See also Mechanism Synthesis
Note: If the Point:
|1.||...is a Point sketch-element (and not a Point that is start-Point, end-Point, centre-Point of another sketch-element) |
|2.||...is, also, not constrained with a dimension or constraint in the Part-Editor|
|3.||...is, also, a Trace-Point...|
...then, you can drag the Point in the Mechanism-Editor and watch the Trace-Point update.
The Point must satisfy ALL of 1 ,2 & 3 before it is possible to drag the point.
To show Velocity and Acceleration vectors from a Point as the Point moves in the graphic-area.
To Show or Hide Velocity and Acceleration Vectors:
In the graphic-area:
|1.||Double-click a Point on a Part that has a Green Part-Outline |
The Point: Vectors and Position dialog-box opens.
|2.||Click the Show or Hide Vectors separator bar|
|3.||Click the Show Velocity Vector or Show Acceleration Vector, or both, check boxes|
|4.||Click the OK button to close the dialog-box.|
Do 1-3 again to show the kinematic vectors of different Points, or to hide vectors for those Points that show vectors.
Note 1: If necessary, change the colour of the graphic-area to Dark Grey to see the vectors more clearly.
Application Settings > Colours tab > Graphic Colors > Background button. .
|•||You can double-click a velocity or acceleration vector to open this dialog-box.|
|•|| (shortcut Alt+C, [C for R13+]) to see the vectors. |
About the Velocity and Acceleration Vectors in the graphic-area
|•||They show only when the Point moves relative to the |
|•||Their length is proportional to the Point's instantaneous Velocity and Acceleration.|
|•||The magnitude of the vectors shows at the arrowhead of each vector in WHITE!|
|•||The colour of each is Blue for Velocity, Red for Acceleration |
|•||Update values and length each step as in the Machine Settings dialog-box.|
To scale the vectors:
You can stretch or shrink the length of the vectors. Click the Velocity and the Acceleration (Accel.) buttons in the Feedback-Area.
|1.||Click the up-button to increase the length of the vectors |
- or -
|1.||Click the down-button to decrease the length of the vectors |
You many need to repeat this many times.
Top-Tip - make the vectors very short to see only the magnitude of the motion-values near to the Point.