Why use a Measurement Function-Block?

Measurement FB:

Shows as a driven dimension in the graphic-area
Dimension, and its first and second motion-derivatives - at its output-connector(s)

Output-Connectors:

Two output-connectors for a measurement between two Points - see more below.
One output-connector for other measurements.

Measure:

Length of a Line
Distance between: two Points, a Line* and a Point, two parallel Lines*
Angle between: two Points, two Lines*, three Points.

* A Line can also be a CAD-Line, the X-axis or the Y-axis.

Add Measurement FB

Toolbar :

Kinematics FB toolbar

Add Mearurement Fb

Measurement FB

Menu :

Add menu > Add Measurement FB

Add :

1.Click Kinematics FB Toolbar > Measurement FB
2.Click the sketch-element, or sketch-elements, between which you want to measure.
3.Click the graphic-area.

The Measurement FB and the Measurement Dimension show in the graphic-area.

Use :

Connect a wire from the output-connector of a Measurement FB to the input-connector of a:

Motion-Dimension FB or Motion-Path FB - the Motion-Part or Motion-Point uses the Measurement as its motion.
Motion FB - the Measurement becomes the X-axis for the Motion, and the output from the Motion FB will be the Y-axis of the Motion

Note: Message in the Feedback-Area may be: '1 Mechanism dependencies detected'. This means, that the motion of a kinematic-chain is a function of (dependent on) the motion of a different kinematic-chain.

See also :

Connecting FBs

Measurement FB - more details

How to Add a Measurement FB

Add Mearurement Fb

STEP 1: Add menu > Add Measurement FB
or
Kinematic FB toolbar > Add Measurement FB
Measrement FB between two Points

Measrement FB between two Points

STEP 2: Click in the graphic-area the sketch-element or between the sketch-elements you want to measure
STEP 3: Click in the graphic-area to place the Measurement FB.

The Measurement FBRed-14-1b is near to the dimensionRed-14-4.

To move the Measurement FB: DRAG the FB
To move the Measurement Dimension: CTRL+DRAG the FB or the Measurement Dimension.

In this image: The dimensionRed-14-4 is between two PointsRed-14-3Red-14-2


The Measurement FB has two output-connectors when it measures between two Points

The Measurement FB has one output-connector when it measures between other sketch-elements.


See details below for motion-values available from the output-connectors.

tog_minusLinear Distance

Length or Radius
Distance between Two Points
Perpendicular Distance between a Point and a Line

Image

Sketch-Elements

Measurement Dimension

GA-MeasureFB-Length

Line or CAD-Line.

Length: Click the Line

Circle or Arc.

Radius: Click the circle or arc.

GA-MeasureFB-ParLines

Two Parallel Lines.

NOT RECOMMENDED

NOT RECOMMENDED...

The Measurement FB may measure the angle between the lines as 0º, 360º or 180º.

See: Angle Measurement between Two Lines, and Perpendicular Distance between Line and Point.

GA-MeasureFB-2Pts

Two Points

Linear Distance and Angle between two Points.

1.Click the Point
2.Click the Line

The Measurement FB has two output-connectors:

Top output-connector: the linear-distance, and its first and second motion-derivatives
Bottom output-connector: the angle, and its first and second motion-derivatives

GA-MeasureFB-LinePt

Point and a Line

Perpendicular Distance

1.Click the Point
2.Click the Line

Note: You many need to add a Line to a Part in the Part-Editor.

To measure a Horizontal Distance or Vertical Distance:  click the X-axis or Y-axis as the Line.

tog_minusAngle between Three Points

Measurement: Angle between Three Points - Internal Angle and External Angle.

Image

Sketch-Elements

Measurement Dimension

MeasurementFB-3P-CCW

Three Points

1.Click 'Apex' Point Red-14-1b
2.Click Point Red-14-2
3.Click Point Red-14-3

Internal Angle

Angle is from Red-14-2 to Red-14-3 in a Counter-Clockwise direction.

MeasurementFB-3P-CW

Three Points

1.Click 'Apex' Point Red-14-1b
2.Click Point Red-14-2
3.Click Point Red-14-3

External Angle

Angle is from Red-14-2 to Red-14-3 in a Counter-Clockwise direction.

tog_minusAngle between Two Lines

After you select the two Lines, and before you click in the graphic-area to place the Measurement FB and angle dimension, you can display one of eight possible angles.

Move your mouse-pointer around the apex of the two lines:

Mouse -Pointer moves Counter-clockwise : 4 angles < 180° : the Acute, Obtuse, Supplementary and Vertical angles (unusual names)!

Mouse-Point moves Clockwise : 4 angles > 180° : the reflex angles

Tutorials and Reference Help Files for MechDesigner and MotionDesigner 14.2 + © Machine, Cam, Mechanism, and Motion Design Software by PSMotion Ltd