2D-Cam dialog-box

To open a 2D-Cam dialog box:

1.Click a 2D-Cam in the graphic-area or Assembly-Tree

In the Selection-Window:

2.Right-click the 2D-Cam

In the contextual-menu:

3.Click Edit element

hmtoggle_plus12D-Cam : Related Elements and Actions

2D-Cams have a number of related commands and dialog-boxes. Their relationships are indicated in the table below.

STEP 1A

Add 2D-Cam

... optional ...

 

STEP 1B

Edit 2D-Cam dialog-box

STEP 2A                

Add Cam-Data FB

STEP 2B

Edit the Cam-Data FB to link it to a 2D-Cam. Do 3A and 3B.

STEP 3A

Do Cam-Analysis [with Graph FB]

STEP 3B

Edit the Cam-Data FB again. Calculate Cam-Coordinates

*Force and Stress analysis only: Configure Power Source

2D-Cam dialog-box

Dialog-R13.2-CamDisplay

Cam Display tab

tog_minus Cam Visibilities 

Dialog-R13.2-CamDisplay-CamVisibilities

Display:

Cam 1
Pitch-Curve. [a dashed line], and / or
Cam 2

Notes:

You must display a minimum of one.
Look in the graphic-area to see which is which cam.

tog_minus Cam Display Options 

Dialog-2DCam-Display-CamDisplayOptions

Display Cam Contour as:

Cam-Profile [default]
Maximum Contact Shear-Stress**
Contact Force**
Pressure Angle

See also: Cam-Data FB


** The Power Source and Material Properties must be correct:

1.Configure the Power Source:  to make the 2D-Cam as the Power Source for the kinematic-chain in which the Cam-Follower is a Part.
2.The Elastic Modulus and Poisson's Ratio must both be correct for the Cam and the Cam-Follower. See Material Properties

Line Thickness of Cam: [default =1]

Increase the thickness of the cam profile in the graphic-area.


Show Instant Centres : For the kinemagicians


Cam Profile Colour : If you have more than one cam in the model, then it is helpful to use a different colour for each Cam.

Example Cam Display Option:

Cams in Graphic Area as 'Cams Only'

 

Cam Profile

 

Red-14-1b Cam 1 and Cam 2 are continuous lines.

Red-14-2 Pitch-Curve is a dashed line.

Cams in Graphic Area as 'Maximum Contact Shear Stress'

Maximum Shear-Stress

Each point around the cam has a unique Maximum Shear-Stress.

See image:

Red-14-1b The value of the Maximum Shear Stress at the contact point

Red-14-2 The colour of the cam profile agrees with the colour-barRed-14-3.

Red-14-3 The colour-bar is a scale of the Maximum Shear-Stress.

Cams in Graphic Area as 'Cams Contact Force'

Contact Force

Refer to the image:

Red-14-1b The value of the Contact Force is at the contact point.

Red-14-2  The colour of the cam profile agrees with the colour-barRed-14-3

Red-14-3 The colour-bar is a scale of the Contact Force

Cams in Graphic Area as 'Cams Pressure Angle

Pressure Angle

Red-14-1b The value of the Pressure Angle is adjacent to the contact point between the Cam-Follower and Cam

Red-14-2 The colour of the Cam agrees with the colour-barRed-14-3

Red-14-3 A colour-bar is a scale of the Pressure Angle

See also Pressure Angle

Cam Parameters tab

tog_minus Material-Properties

Dialog-R13.2-CamDisplay-MaterialProps

To calculate the Maximum Contact Shear-Stress enter:

Cam and Cam-Follower's Poisson's Ratio

Cam and Cam-Follower's Elastic Modulus


Elastic Modulus is its Young's Modulus.


Notes:

Globe-www www.matweb.com [internet link] for material properties.

tog_minus Cam Range and Radius...

Dialog-R13.2-CamDisplay-CamRangeRadius

Rise - Return

Continuous Profile
Open Profile

Read-only - even if it does not seem to be read-only!


Radius of Curvature Warning [%]

IF (Radius-of-Cam-Curvature / Radius of Cam-Follower ) × 100%. < RoC Warning %

The Cam profile in the graphic-area becomes RED if its Radius-of-Curvature becomes too small as compared to the Radius of the Cam Follower.

There is a danger of Cam-Undercutting.

See also Application Settings


Cam Range Start & Cam Range:

Calculate the cam over a reduced range. Usually less than 360.

E.g.:

If the cam rotates exactly 2× in one machine-cycle, then enter Cam Range Start: 0 ; Cam Range : 180
If the cam is a 'slot-cam', the cam-follower moves along the cam in two directions. Then, enter a value in the Cam-Range box to calculate the cam only as the cam-follower moves in one direction.

This is not always possible, as the cam-follower may have a complex motion in the right and left directions, even at points that are not at the two ends of the cam.

CamRange-OpenCam

Examples of Open / Closed Cam and Cam Range

A reciprocating 'Slot-Cam' that moves to the right and left - see image.

You want to show the top of the Slot-Cam. The Cam-Follower is at the left when the MMA= 0, and the right when the MMA=120.

Cam-Range Start: 0

Cam Range: 120

CamRange-ClosedCam

READ-ONLY

Rise Only

The cam does not have a 'fly-back' line.

Rise-Return

The cam does have a 'fly-back' line.

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