Dialog: Cam Coordinates

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Dialog: Cam Coordinates

Cam-Coordinates dialog-box

See Add Cam-Data FB  


2D-Cam: Elements, Parameters, Analysis, Coordinates

1.Add a 2D-Cam - see: Add 2D-Cam

2.Review the 2D-Cam's Display, Properties - see 2D-Cam dialog-box

Then:

3.Add a Cam-Data FB - see Add Cam-Data FB

4.Link the 2D-Cam to the Cam-Data FB - see Open and Link the Cam-Data FB to a 2D-Cam

Then:

5.Analyze 5 different parameters for the 2D-Cam -  see Cam-Data FB - Analysis Parameters

6.Calculate the Cam-Coordinates - see below

Cam-Data dialog-box: Cam-Coordinates

If necessary, link the Cam-Data FB with a 2D-Cam - see Open and Link the Cam-Data FB to a 2D-Cam


MD-DIALOG-2DCAM-CAMCOORDINATES-B

MD16.1 - Changes to Save as STEP file (Cam-Coords. toolbar, Save as 1s Red-14-2)


1s - Cam-Coordinates toolbar

2s - End-Caps apply to Linear Slot type and Open Cams.

3s  - STEP ONLY - select Inner Cam, Outer Cam, Groove Cam, or a 'negative' Groove Cam

4s - Radial Clearance - Apply if you want additional clearance - e.g. for Groove Cams

5s - Read-Only - Radius of Inner-Cam and Outer-Cam. To help you to specify the Plate-Radius and Bore-Radius (see also 7s )

6s - Read-Only - Schematics to indicate the Cam type, and if the Plate-Radius and Bore-Radius are suitable (see also 7s )

7s - STEP-ONLY - Dimensions that apply when you save the cam as a STEP file-type (see 1s Red-14-2)

8s - STEP-Only - Front or Back Cam Face from which to extrude the Groove-Cam by Cam-Depth (see also 7s )

9s - # Points with XY-Points, or BiArc Error with BiArcs (see toolbar)

10s - XY-Points / BiArcs

1s tog_minus Cam-Coordinates toolbar:

2s - End Caps

End Caps relate only to Slot-Cams, sometimes known as Linear-Cams, or Ramp-Cams.

End-Caps - Show

End-Caps - Show

Show or Hide

End-Caps work well when the independent input to the Cam-Follower moves in one direction - see top image

If the independent input reverses its direction in the middle of its travel, you will see End-Caps in the middle of the Slot-Cam. - see middle image to the left.

The best option before you export Cam-Coordinates is to add a new dummy slot-cam - but Linearize its independent input.

To Linearize the Independent-Input:

1.Connect a wire from a Linear-Motion-FB to a Gearing FB (enter a Gearing Ratio = (Linear Travel of Independent Input) /360).

2.Connect a wire from the Gearing FB to a Motion-Dimension FB as the Linear motion of the Slot-Cam.

As the MMA increases from 0 to 360, the independent input to the Cam will increase from 0 to Linear Distance

Slot-Cam with 'False' End-Cams

Slot-Cam with 'False' End-Cams

End-Caps - Hide

End-Caps - Hide

4s - Radial-Clearance

Example Radial-Clearance

Example Radial-Clearance

See also : 2D-Cam dialog-box > Cam Range and Radius


Radial Clearance (mm) Default = 0 , Negative or Positive

Radial-Clearance : Positive Clearance between the Cam-Follower Roller and the Cam-Profile.

AND (On the Feature Request List):

Negative Radial-Clearance : (increase the Size of the Cam) when you want Cam-Coordinates for a Rough Cut.

E.G.1: Groove-Cam - you need a small clearance to make sure the Cam-Follower bearing does not jam in the Cam-Groove.

E.G. 2: Conjugate-Cam - you may want a small clearance to compensate for tolerances in the cam assembly.

NOTE 1:

Stud-type Cam-Followers often have a large negative tolerance - e.g. . You may consider that to be enough clearance.

Note 2:

If you select a Follower Bearings in the Extended Format of this dialog, the diameter of the Circle that you add to represent your Cam-Follower will automatically change to the BASIC Diameter of the Follower-Bearing.

3s 5s 6s 7s 8s STEP-FILE Options

7s - Dimensions for STEP file ONLY

This section relates to the options when you save the cam as:

STEP file-type (Red-14-2 in the toolbar), and

3s Cam as: Groove  

These images are of cams that are saved from MechDesigner as a STEP file-type, and then opened in SolidWorks to show the features.

MD-Dialog-2DCam-CamCoordinates-CamDepth

7s Plate-Depth

The total depth of the Cam-Plate.

MD-Dialog-2DCam-CamCoordinates-GrooveDepth

7s Cam-Depth

The depth of the Cam cut into the Cam-Plate. The width of the Cam-Flanks.

Note: Plate-Depth - Cam-Depth ≥ 2 mm

MD-Dialog-2DCamCoordiantes-STEP-Cam-Radius

7s Plate-Radius

The radius of the Cam-Plate, when you select an Outer-Cam or a Groove-Cam - see 3s

MD-Dialog-2DCamCoordiantes-STEP-Bore-Radius

7s Bore-Radius

The radius of the hole through the center of the Cam-Plate

Offset Distances for Stationary Cams ONLY

MD-Dialog-2DCamCoordiantes-STEP-No-Offset

7s Offset-X = 0, Offset-Y = 0

These are Read-Only if the Cam is a rotating part.

If the Cam is stationary (in the Base-Part), then you can move the center-Point of the Blank-Radius and the Bore-Radius to the center of the Cam.


Image left: the Blank-Radius and Blank-Bore with Offset-X=0,-Y=0.

MD-Dialog-2DCamCoordiantes-STEP-Offset

7s Centre-X = 20, Center-Y = 30

Image left: the Blank-Radius and Blank-Bore with Offset-X=20,Y=30.

The maximum radius of the Blank-Bore can be increased, and the minimum radius of the Blank-Radius can be decreased.

5s Read-Only - Minimum Radius of Inner Cam, Maximum Radius of Outer Cam.

These values are relative to the Offset-X and Offset-Y values. (Do Edit toolbar > Rebuild if they do not update when you add an Offset-X or Offset-Y

These value are useful to know when you want to make sure there is a minimum wall thickness.

MD-Dialog-2DCamCoordiantes-ReadOnly-Max-MinRadius

6s Schematics: Cam type, Dimensions are OK or Not-OK to save as STEP file.

Outer  | Inner Cams: Can I save the Cam as STEP?

MD-Dialog-2DCamCoordiantes-Schematic-B

MD-Cam-OKabove Outer and Inner :

1s Red-14-5Red-14-6(Cam-Coordinates toolbar) XY-Points, Equal-Increments :you can save as a STEP file-type.

MD-Dialog-2DCamCoordiantes-Schematic-Outer-Inner-NOT

MD-No-Entryabove Outer and Inner :  

1s Red-14-5Red-14-6(Cam-Coordinates toolbar) BiArcs, Chord-error: you cannot save as a STEP file-type.  

Status of Cam Type, Blank-Radius and Bore-Radius relative to Cam-Size

The Plate-Radius 7s parameter applies to Outer and Groove Cams only 3s

The Bore-Radius 7s parameter applies to all Cam types 3s

MD-Dialog-2DCamCoordiantes-Groove-BlankOK-BoreOK-

3s Groove-Cam

7s Plate-Radius is OK - it is greater than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is OK - it is less than the Minimum Radius of the Inner-Cam 5s

MD-Dialog-2DCamCoordiantes-Groove-Blank2Sm-BoreOK-

3s Groove-Cam

7s Plate-Radius is NOT OK - it is less than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is OK - it is less than the Minimum Radius of the Inner-Cam 5s

MD-Dialog-2DCamCoordiantes-Groove-BlankOK-Bore2Bg

3s Groove-Cam

7s Plate-Radius is OK - it is greater than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is NOT OK - it is greater than the Minimum Radius of the Inner-Cam 5s

MD-Dialog-2DCamCoordiantes-Groove-Blan2Sm-Bore2Bg

3s Groove-Cam

7s Plate-Radius is NOT OK - it is less than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is NOT OK - it is greater than the Minimum Radius of the Inner-Cam 5s

MD-Dialog-2DCamCoordiantes-Inner-Blank0-Bore0

3s Inner-Cam ONLY

7s Plate-Radius is 0mm

7s Bore-Radius is 0mm - the Cam will not include a Hole through its center

MD-Dialog-2DCamCoordiantes-Inner-BlankOK-BoreOK

3s Inner-Cam ONLY

7s Plate-Radius is OK - it is greater than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is OK - it is less than the Minimum Radius of the Inner-Cam 5s

MD-Dialog-2DCamCoordiantes-Groove-Blank2Sm-BoreOK-

3s Inner-Cam ONLY

3s Plate-Radius is NOT OK - but, this dimension is ignored with Inner Cams 7s

3s Bore-Radius is OK - it is less than the Minimum Radius of the Inner-Cam 5s

You can save the STEP file.

MD-Dialog-2DCamCoordiantes-Groove-BlankOK-Bore2Bg

3s Inner-Cam ONLY

7s Plate-Radius is OK - it is greater than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is NOT OK - it is greater than the Minimum Radius of the Inner-Cam 5s

You can NOT save the STEP file.

MD-Dialog-2DCamCoordiantes-Outer-BlankOK-BoreOK

3s Outer-Cam ONLY

7s Plate-Radius is OK - it is greater than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is OK - it is less than the Minimum Radius of the Inner-Cam 5s

MD-Dialog-2DCamCoordiantes-Groove-Blank2Sm-BoreOK-

3s Outer Cam ONLY

7s Plate-Radius is NOT OK - it is less than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is OK - it is less than the Minimum Radius of the Inner-Cam 5s

You can NOT save the STEP file.

MD-Dialog-2DCamCoordiantes-Groove-BlankOK-Bore2Bg

3s Outer-Cam ONLY

7s Plate-Radius is OK - it is greater than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is NOT OK - it is greater than the Minimum Radius of the Inner-Cam 5s

You can save the STEP file.

MD-Dialog-2DCamCoordiantes-Ng-Groove-OKOK

3s Negative Groove-Cam

7s Plate-Radius is OK - it is greater than the Maximum Radius of the Outer-Cam 5s

7s Bore-Radius is OK - it is less than the Minimum Radius of the Inner-Cam 5s

9s Points / Biarcs

Number-of-Points Red-14-5 Red-14-6

MD-Dialog-CamCoord-NoPts

Number-of-Points (#)

Use with XY-PointRed-14-5 / Equal IncrementsRed-14-6 options (Maximum ~100,000. Experiment!)

Enter number of points around the cam at equal increments of machine angle.

Maximum BiArc Error Red-14-5 Red-14-6

MD-Dialog-CamCoord-BiArcError

BiArc Error (mm)

Use with BiArcRed-14-5Red-14-6 options (Minimum ~0.01µm. Experiment!)

Enter maximum error between the True Cam-Profile and the Cam-Profile that is calculated and saved as BiArcs


Notes:

Note 1: When a 2D-Cam is a rotating-cam, make sure that the start-Point (origin) of the Part that is the Cam-Part is at the center of rotation.

Note 4: The data will be on the Front-View of the SOLIDWORKS document, with Z columns as 0. SOLIDWORKS fits a Spline to it immediately. If you need to put the data on a different plane in SOLIDWORKS, then you will need to change the data slightly in Excel. Add a column of zeros in the X, Y or Z column. Possibly multiply the X-column by -1. to mirror the Part. Then import the data as a Curve entity into SOLIDWORKS.


The Cam as BiArc Data has six columns:

1

2

3

4

5

6

Arc Radius

Arc Start Point X Coordinate

Arc End Point X Coordinate

Arc Start Point Y Coordinate

Arc End Point Y Coordinate

Arc Angle Range (degs)


Save Options - Removed in MD16 +

'Save Options' box.

'Save Options' box.

Note: This table may be removed in MD16 and later.


Click the Save Option button to show the Delimiter you can select as a List-Separator in a Text file.

The ASCII Character you select as the List-Separator should be different to ASCII Character that you use as the Decimal-Separator.

In Europe, the Decimal-Separator is a Comma

In the Rest of the World (I think) the Decimal-Separator is Stop / Period.

Clearly, if the Decimal-Separator and the List-Separator are the same, then it will be difficult to identify one data-value from the next data-value.

We add the delimiter when you Save a Cam to a Text-File, or you Copy the Data to the Clipboard.


STEP Save Options: - Not sure what these do

End Correction

Interpolate kinematic points.