We can also show kinematic values at a machine-angle as defined by the Master-Machine-Angle (MMA).
The Element-Properties dialog-box is a list of kinematic values for an element at the Master-Machine-Angle.
Elements that have Element-Properties are:
•Part, Pin-Joint, Slide-Joint, 2D-Cam, Part-Outline, Line, Circle, Arc, Point, Gear-Pair, Function-Blocks, Wire...
To show the Elements Properties dialog-box:
In the graphic-area:
1.Hover above an element
2.CTRL + CLICK
The Element-Properties dialog-box is now open.
The two steps are also described as Hover+CTRL+Click key combination.
The Element-Properties dialog-box does not open:
•If you CTRL+Click more than one element. You must try again.
Element-Properties dialog-box : Point
Element-Properties of a Point.
In this case, the Element-Properties are of Point23', which is a child to Part3, which is a child to Mechanism.
Properties of a Point:
•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.
oi , j : the Velocity and Acceleration, in the X-axis and Y-axis directions, respectively.
o|n| : the magnitude of the Velocity and Acceleration
oΘ : the direction of the Velocity and Acceleration . ('0' is the X-axis direction of the Mechanism-Plane)
V indicates they are 'vector' values.
A Trace-Point shows the path of a Point on the Mechanism-Plane for one machine-cycle.
You can show any number of Trace-Points at one time.
Other terms for Trace-Point are: locus, curve, and coupler curve.
To show a Trace-Point:
1.Click Kinematic-elements toolbar > Add Trace-Point
2.Click a Point in the graphic-area
3.Click in the Command-Manager
Do 1-3 again to show Trace-Points of other Points.
How to Drag a Point to continually update the Trace-Point.
In the Part-Editor
1.Do Geometry toolbar > Add Point sketch-element
Do not add to the Point any constraints or dimensions.
In the Mechanism-Editor
1.Do Kinematic-elements toolbar > Add Trace-Point
2.Drag the Point (slowly) in the Mechanism-Editor.
Video : Add Trace-Point
Point Properties dialog-box
In the graphic-area:
1.Double-click a Point of a Part that is kinematically defined.
Use Filters toolbar> Points if this is difficult!
The Point Properties dialog-box opens. (or the Select-Elements dialog - select one Point from the Selection-Elements dialog if you click more than one Point)
3.Click the Show Velocity Vector
4.Click Show Acceleration Vector
5.Click to close the dialog-box.
Do 1-5 again to show or hide Kinematic Vectors of different Points
If necessary, change the color of the graphic-area, or the vectors, to see more clearly the vectors and their kinematic-values - see Application Settings > Graphics tab > Display colors
About the Velocity and Acceleration Vectors in the graphic-area
•The vectors show only when the Point moves relative to the Mechanism-Plane
•The length of the vectors are proportional to the Point's instantaneous Velocity and Acceleration.
•The magnitude of the vectors shows at the arrowhead of each vector
•The color (default) of the vectors are Velocity, Acceleration
•The vectors update their values and length each Machine-Step
The vectors are relative to the:
•Local xyz axes - Mechanism Axes (default)
•Global XYZ axes - mODEL-aXES
Velocity Vector Options
The Velocity vectors are the:
•Magnitude of the Velocity (default)
•X component of the velocity
•Y component of the velocity
To scale the vectors:
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
Top-Tip - make the vectors very short to see only the magnitude of the vectors near to the Point.
DO NOT USE UNTIL FURTHER NOTICE.
To show the Dimensional Instant Radar Scale:
In the graphic-area:
The Instant-Scale shows next to your mouse-pointer.
As you zoom-in or zoom-out the scale also auto-scales.
There are 10 concentric circles.
There are two thick circles, which show the actual dimension value at their radii.
•Inner Dark Circle (50.000 in the image) is circle #5
•Outer Dark Circle (100.000 in the image) is circle #10
Linearly interpolate the dimensions for the other circles.
Note: If the numbers have too may zeros, the inner number overwrites the outer number.
You should reduce the number of digits. To reduce the number of zeros: Application-Settings > Number-Format.
MechDesigner compiles Parts and Joints into Dyads.
Dyads have two(2) Parts and three(3) Joints.
You may find that the two Parts assemble correctly when you add the last joints.
But, when you cycle your model, you may find that Parts cannot assemble at all points in the machine-cycle.
The Kinematics-Tree indicates to you whether the Dyads can assemble or not.
The Kinematics-Tree uses symbols to indicate three KINEMATIC STATES.
- There is a kinematic solution for the Kinematic-Chain at all points in the machine-cycle.
- There is not a kinematic solution at all points in the machine-cycle.
- There is not a kinematic solution at this instant in the machine-cycle.