Add 2D-Cam

See also: 2D-Cam dialog-box


What is a 2D-Cam?

In a machine, a 2D-cam is a planar shape.

A Follower-Shape is in continuous contact with the 2D-Cam. The motion and shape of the 2D-Cam specifies the motion of the Follower-Shape.


2D-Cam : Related Elements

STEP 1A

Add 2D-Cam - You are here!

... optional ...

 

STEP 1B

Edit 2D-Cam dialog-box

STEP 2A                

Add Cam-Data FB

STEP 2B

Edit Cam-Data FB to select a 2D-Cam

STEP 3A

Do Cam-Analysis (with Graph FB)

STEP 3B

Calculate Cam-Coordinates as Points or Arcs

*Force analysis - see Configure Power Source


Prepare 2D-Cam

GA-Add2DCam-Prep1

You need these elements in the model:

1.A Part for the 2D-Cam - the Cam-Part
2.A Profile, as the Cam-Follower Shape, on a different Part - typically a Cam-Roller

The two Parts must be kinematically-defined (Green) Parts

The two Parts should move relative to each other.

<<< An example preparation

See Shape of the Cam-Follower.


STEP 1A: Add 2D-Cam:

Add 2D-Cam icon

Machine-elements toolbar > Add 2D-Cam

Menu :

Add menu > Mechanism sub-menu > Add 2D-Cam

CM-Add2DCam-0

STEP 1: Click Add 2D-Cam

The Command-Manager indicates you must select two elements:

Select Part to carry the Cam - this becomes the Cam-Part.
Select Profile to be... - this becomes the Cam-Follower Profile - typically a Cam-Roller.

CM-Add2DCam-1

 

STEP 2: Click a Green Part-Outline - Cam-Part
STEP 3: Click a Profile - the Follower-Shape - in a different Part
STEP 4: Click OK-tiny-11-15 in the Command-Manager.

GA-Add2DCam-Prep2

Result:

MechDesigner calculates the internal and external 2D-Cams and shows them in the graphic-area.

You can also display the Pitch-Curve

See 2D-Cam dialog-box

AT-2DCam-0

Assembly-Tree

MechDesigner adds a Cam-plate as a child to a Part, and the 2D-Cam as a child to the Cam-plate. You can add many 2D-Cams to the same Cam-plate.

MechDesigner identifies the Cam as a 'Good' or a 'Bad' Cam - based on its Radius-of-Curvature only.

It is your responsibility to make sure the cam is suitable for your needs.

AT-2DCam-Good

A Good Cam

AT-2DCam-Bad

 A Bad Cam

Notes:

1.To show a swatch (Colour Chart) of Pressure Angle, Contact Force, or Maximum Shear Stress: see the 2D-Cam dialog-box
2.Add a Cam-Data FB to calculate Cam-Coordinates, and to use its output-connectors to plot Pressure Angle, Contact-Force, and Contact Shear-Stress with Graph FB
3.If a 2D-Cam has an SSR or SSP Dyad in its kinematic-chain, you should use Show other Mechanism Sketches to make sure the Cam-Profile is correct.

See also:

2D-Cam dialog-box

Cam-Data FB

Cam-Coordinates dialog-box

Video:

 

'Expand' then 'Play'

How to...

Add a 2D-Cam

 

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