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 Parts that are the cam and the cam-follower are specified before you can use Add 2D-Cam.

Thus, the Cam and the Cam-Follower Parts must be Green before you do Add 2D-Cam.

See Also: 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

If needed add Conjugate Cam and Cam-Follower. Add Conjugate-Cam FB [MD14+]


-> EDIT to OPEN ->

[optionally]

Cam Display and Properties dialog-box

Display Cam1, Pitch-Circle, Cam2
Display Cam as Profile, Contact-Force
Display Colour
Cam and Follower material-properties for Cam-Analysis [E, µ]

Identify Conjugate Cam, if needed [MD14+]


STEP 2 : Add Cam-Data FB

 

-> EDIT to OPEN ->

[necessary]

STEP 3 : Cam-Coordinates dialog-box

Select 2D-Cam [see STEP 1]

STEP 4 : ANALYSIS WITH:

Cam-Data FB and Graph FB

Output-Connectors of Cam-Data FB are:

Contact-Force*
Contact-Shear-Stress*
Radius-of-Curvature
Pressure-Angle
Entrainment Velocity [MD14+]

 

STEP 5 : CAM-COORDINATES

Save and export Cam-Coordinate options:

as Points or Biarcs
save as DXF, TXT, STEP [New in R13.2]
transfer cam to SOLIDWORKS

STEP 5 : *With Cam Force Analysis: Configure Power Source, Mass Properties of Parts, Conjugate Cam FB

Add 2D-Cam

Add 2D-Cam icon

Machine Elements Toolbar : Add 2D-Cam

Menu:

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

GA-Add2DCam-Prep1

Preparation:

You need two elements:

1.A Part to which we add the 2D-Cam
2.A Profile element on a different Part that becomes the Cam-Follower.

The two Parts must be kinematically-defined, with Green Part-Outlines.

See Shape of the Cam-Follower.

CM-Add2DCam-0

What to do:

1.Click Machine-elements toolbar > Add 2D-Cam

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

'Select Part to carry Cam'
'Select Profile to be... Cam-Follower'

CM-Add2DCam-1

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-tiny-11-15 in the Command-Manager.

GA-Add2DCam-Prep2

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

AT-2DCam-0

Assembly-Tree

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

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

Warning

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

AT-2DCam-Good

 A 'Good' Cam

AT-2DCam-Bad

 A 'Bad' Cam

Video:

 How to...

 Add a 2D-Cam

 

'Expand' then 'Play'

 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

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