What is a Point-Cloud?

In general they term Point-Cloud is used in the engineering community to describe a set of coordinates that specify the solid surface of a 2D or 3D object..

In MechDesigner, the coordinates are usually of a 2D-Cam, and the coordinates are frequently measured with a Coordinate Measurement Machine (CMM).

Point-Cloud FB dialog-box

We use the Point-Cloud dialog-box to import the Point-Cloud data.

We also use the Point-Cloud dialog-box to fit a smooth curve to the data. The curve is mathematically smoother than the data in the original Point-Cloud.


Application Note: Reverse-engineer a 2D-Cam.

Measure an old Cam, import the Point-Cloud and define it as a new curve in the Point-Cloud dialog-box.

Use the curve, in combination with a Magnetic-Joint and a Graph FB to find the motion of a Cam-Follower.

Use the tools in MotionDesigner to identify the motion of the Cam-Follower.

We can redefine the motion with an improved motion. WE can use that motion to redefine the 2D-Cam.

Finally, you can recalculate the cam-coordinates and export them for cam manufacture.

Point-Cloud FB

Add Point-Cloud FB

Modelling FB toolbar > Point-Cloud FB [Above Graphic-Area]

Menu:

Add menu > Add Point-Cloud FB

Dialog-box:

Point-Cloud dialog-box

What to do:

STEP 1.  Add the Point-Cloud FB to the graphic area

A Point-Cloud is a child to Part.

1.Click Modelling FB toolbar > Add Point-Cloud FB

The Command-Manager shows one selection box

3.Click OK-tiny-11-15 in the Command-Manager

The Design-Set FB is now in the graphic-area and the Assembly-Tree.

Result:

The Point-Cloud is an element that is child to the Part.

Edit:

STEP 2.  Edit the Point-Cloud FB to import a Point-Cloud and fit a curve to the data, with the Point-Cloud dialog-box

Top open the Point-Cloud dialog-box:

1.Explore the Assembly-Tree to find the Point-Cloud that is a child element to the Part
2.Double-click the Point-Cloud FB to open the Point-Cloud dialog-box

-or...

...see 'How to open a Dialog-Box'.

Video:

See YouTube: http://youtu.be/IME9Eb4mpQE

 

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