What is a 2D-Cam?

In a machine, a 2D cam is a planar [flat] shape that moves a cam-follower with a specified motion. The 2D-cam and the cam-follower remain in continuous contact [usually].

In MechDesigner, the motions of the cam and the cam-follower are specified before you can use Add 2D-Cam. The Parts will be Green.

Compare with a 3D-Cam.

2D-Cam elements and 2D-Cam dialogs

ADD ELEMENTS

 

DIALOG-BOXES

STEP 1: Add 2D-Cam

Select

Part: as the Cam-Part
Profile: as the Cam-Follower

-> EDIT to OPEN ->

[optionally]

Cam Display and Properties dialog-box

Display Cam1, Pitch-Circle, Cam2
Display Cam as Profile, Contact-Force
Display Colour

*Material-Properties for Cam-Analysis

STEP 2 : Add Cam-Data FB

 

-> EDIT to OPEN ->

[necessary]

STEP 3 : Cam-Data FB dialog-box

Select the 2D-Cam [STEP 1]

STEP 4A : Cam-Analysis [with a Graph FB]

Output-Connectors of Cam-Data FB:

Contact-Force*
Contact-Shear-Stress*
Radius-of-Curvature
Pressure-Angle

 

STEP 4B : Cam-Coordinates dialog-box

Cam-Coordinates

as Points or Arcs
save as DXF, TXT, STEP
transfer to SOLIDWORKS

STEP 5 : [*Force analysis only]: Configure Power Source, Mass Properties of Parts

Add 2D-Cam

AddCamTrack1

Mechanism Local Toolbar : Add 2D-Cam icon

Command

Mechanism menu > Add 2D Cam

MD-AddCam1

Preparation:

You need two elements:

1.A Part to which we will add the 2D-Cam2s
2.A Profile element with the Cam-Follower4s.

The 'Cam Part' and the 'Profile element' must be in different Parts, each with a Green Part-Outline2s3s.

See Also Shape of the Cam-Follower.

MD-AddCamCM

Menu-AddCam3

What to do:

1.Click Add 2D-Cam in the Mechanism Local-Toolbar.

The Command-Manager shows the two elements you need to select:

'Select Part to carry Cam'
'Select Profile to be Cam-Follower'
2.Click a Green Part-Outline (a kinematically-defined Part) as the Part that 'carries' the cam.
3.Click a Profile in a different kinematically-defined Part, to be the shape of the Cam-Follower.
4.Click OK in the Command-Manager.

Menu-AddCam4

Result:

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

We call the Cams: Cam 1 and Cam 2. You can also display the Pitch-Curve


See Cam Display and Properties dialog-box

Menu-AddCam5

Assembly-Tree

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

MechDesigner uses an icon to identify if it is 'Good' or 'Bad' Cam - based on Radius-of-Curvature only.

AT-GoodCam

A 'Good' Cam

AT-BadCam

A 'Bad' Cam

Warning

Please note: It is your responsibility to make sure the cams are suitable for your need.

Video:

 How to...

 Add a 2D-Cam

Notes:

1.To show a scaled colour 'swatch' and colours along the Cam for Pressure Angle, or Contact Force, or Maximum Shear Stress: see the Cam Display and Properties dialog-box
2.Use a Cam-Data FB to get the Cam-Coordinates.
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 is correct.

See Also: Cam Display and Properties dialog-box, Cam-Data FB. Cam-Coordinates dialog-box

Help Files for MechDesigner and MotionDesigner 11.1 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd