MechDesigner Reference & User Interface > Dialogs > Dialog: Function-Block: Cam-Coordinates

Cam-Data FB > Cam-Coordinates

See Add Cam-Data FB

Use a Cam-Data FB to:

Calculate the Inner, Outer, and/or Pitch-Center Cam-Profiles as:

•XY-Points

•BiArcs

Export a Cam-Profile directly to SolidWorks as XY-Points or BiArcs.

Save the Cam-Coordinates to your hard-drive as:

•XY-Points - TXT

•BiArcs

•DXF

•SLDCRV (XY(+Z) Points)

•STEP file - see Options for: Save as Cam as a STEP file:

2D-Cam: Typical Work-flow

1.Add a 2D-Cam - see Machine elements toolbar > Add 2D-Cam

If the new 2D-Cam is one from a pair of Conjugate-Cams, or it is one flank of a Groove-Cam

1.a. Add a Conjugate-Cam FB - see Machine elements toolbar > Add Conjugate Cam FB

1.b. Edit the Conjugate-Cam FB to select least two 2D-Cams - see Conjugate-Cam dialog.

2.Select a 2D-Cam or a Conjugate-Cam FB as the Power Source for the Follower - see Configure-Power Source

3.Review the 2D-Cam : Display, Properties, Roller-Life, Cam-Life, ... - see 2D-Cam dialog

4.Add a Cam-Data FB - see Kinematic FBs toolbar > Add Cam-Data FB

5.Edit the Cam-Data FB to link it to the 2D-Cam- - see Cam-Data dialog : Cam Analysis

6.Connect wires from the Cam-Data FB to a Graph FB to analyze 5 parameters - see Cam-Data dialog : Cam Analysis

7.Edit the Cam-Data FB again to calculate the Cam's Coordinates - see Cam-Data dialog : Cam-Coordinates

Cam-Data dialog: Cam-Coordinates

If necessary, link the Cam-Data FB with a 2D-Cam - see Cam-Analysis

- Cam-Coordinates toolbar

- End-Caps - shows ONLY when the first XY-coordinate of the Cam does not equal the last XY-coordinate. For example, a linear Slot-Cam.

- Inner / Outer - status of the Cam-Coordinate calculations and Cams the STEP file options are possible - See STEP file Options

- Cam Options - calculate, display, and/or save the cam-profile coordinates for the Inner, Outer, Groove, or Negative Groove cam-type. The Negative Groove cam-type applies to the STEP file-type only.

- Radial Clearance - offset the Cam-Profile from the true Cam-Profile

- # Points to calculate the XY-Points ( see toolbar below )

- BiArc Error to calculate the BiArcs ( see toolbar below )

Options for: Save as .STEP file-type

When you save the Cam-Profile as a STP (STEP) file, you can edit these parameters:

MD-DIALOG-CAMCOORDINATES-STEPFILEOPTIONS

- Front Face, Back Face - the face to cut the Groove-Cam into the Cam-Plate (see more below)

- Dimensions of the Cam-Plate (see more below)

- Schematics to indicate the Cam type, and if the Plate-Radius and Bore-Radius are suitable (see more below )

- Stationary Cam only - enter an X-Offset and Y-Offset to move the center of the Cam-Plate (see more below ).

- Min(minimum) Inner-Cam and Max(maximum) Outer-Cam (read-only) - radii of the Inner and Outer Cam-Profiles. They should help you specify the Plate-Radius and Bore-Radius (see more below )

Dimensions for STEP file ONLY

These images show the features of a Groove-Cam that has been exported and opened in SolidWorks:

MD-DIALOG-CAMCOORDINATES-STEPFILEOPTIONS-StepDims

Plate-Depth

The total depth, or thickness, of the Cam-Plate.

MD-Dialog-2DCam-CamCoordinates-GrooveDepth

Cam-Depth

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

Minimum Plate-Depth – Cam-Depth ≥ 2 mm

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

Plate-Radius

The radius of the Cam-Plate, when you select: Outer or Groove-Cam

Bore-Radius

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

Schematics of Cam type; Are the Dimensions OK or Not-OK?

MD-DIALOG-CAMCOORDINATES-STEPFILEOPTIONS-StepDims

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

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

The Bore-Radius parameter applies to all Cam types

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

Groove-Cam

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

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

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

Groove-Cam

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

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

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

Groove-Cam

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

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

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

Groove-Cam

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

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

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

Inner-Cam ONLY

Plate-Radius is 0mm

Bore-Radius is 0mm - the Cam does not include a Hole through its center

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

Inner Cam ONLY

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

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

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

Inner-Cam ONLY

Plate-Radius is NOT OK - this dimension is ignored with Inner Cams

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

You can save the STEP file.

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

Inner-Cam ONLY

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

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

You can NOT save the STEP file.

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

Outer-Cam ONLY

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

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

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

Outer Cam ONLY

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

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

You can NOT save the STEP file.

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

Outer-Cam ONLY

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

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

You can save the STEP file.

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

Negative Groove-Cam

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

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

Minimum/Maximum Radius of Cams, Offset X and Offset Y.

•Min Inner-Cam - Minimum radius of Inner Cam

•Max. Outer-Cam - Maximum radius of Outer Cam (see also )

These values are useful to know when you want to make sure there is a minimum difference between the:

•Bore-Radius and the minimum radius of the Inner Cam.

•Plate-Radius and the maximum radius of the Outer Cam.

X-Offset and Y Offset

When the Cam is stationary, enter an X-Offset and Y-Offset to move the center of the Cam-Plate relative the 0,0 of the Mechanism-Plane / Base-Part.

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

X Offset = 0, Y Offset = 0

Read-only if the Cam is a not stationary.

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

X Offset = 20, Y Offset = 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.

Notes:

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

Note 4: Cam-Data and SOLIDWORKS.

Default Plane in SOLIDWORKS: When you export the Cam-Profile as a SLDCRV file and import that file into SOLIDWORKS, with Insert > Curve > Curve Through XYZ Points... the Cam will be coplanar with the Front-Plane of the SOLIDWORKS part document.

To move the Cam-Profile to a different Plane:

1.Calculate the Cam-Profile as XY-Points

2.Save it as a SLDCRV file-type.

3.Open the SLDCRV file in EXCEL - the cam-coordinates use the A, B, and C columns for the X, Y, and Z cam-coordinates, respectively. Z coordinates are all 0s.

4.To move the Cam to the:

a.TOP Plane: Move the C column to the D column, the B column to the C column, and the D column to the B-column (that is, swap the B and C columns)

b.RIGHT Plane: Move the C column to the D column, the B column to the C column, move the A column to the B column, and the D column to the A column (that is, swap the A and C columns)

c.(and/or) To mirror the cam: Multiply the X-column data by –1)

5.Save the Data as a CSV (MS-Dos) file

6. Close the file in EXCEL

7.Use Windows File Explorer to rename the file to file-name.SLDCRV

8.In SOLIDWORKS, do Insert > Curve > Curve Through XYZ Points... and browse to file-name.SLDCRV

Note5: The Cam as BiArc Data has six columns:

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

Degrees

Click icon to switch between XY-Points and BiArcs.
		Clear ALL coordinates from the table
		Save Cam-Coordinate data as: •STP(STEP)- XY Points only •DXF •CSV (Comma Separated Values) - Header, then # Data-Point, X-data, Y-data, Z-data as 0.0 •TXT - Header, then # Data-Point, X-data, Y-data, Z-data as 0.0 •SLDCRV (SOLIDWORKS Curve file, tab delimited ) - XY Points only , X-data, Y-data, Z-data as 0.0 Note: If this icon is not enabled, then make sure the Plate-Radius parameter is larger than the Maximum Radius of the Outer Cam. See STEP File Options.
		Copy Coordinates to your Clipboard
If Cam Option is Groove or Negative Groove, click to toggle between:
		- Inner Cam-Profile - Outer Cam-Profile - Pitch-Curve ( XY-Points only )
Toggle how to calculate the Cam:
		XY-Points - Calculate Cam as XY Coordinates at equal increments of the Master Machine Angle. Enter the Number-of-Points # Points Use to toggle between the Inner, Outer, and Pitch-Circle of the Cam-Profile.
		BiArcs - Calculate Cam as BiArcs with a maximum Chordal Error (see BiArcs) Enter the maximum Chordal-Error as BiArc Error The number of BiArcs we calculate is a function of the BiArc Error you enter and the shape of the Cam-Profile.
		Before you click this button, make sure that SOLIDWORKS is open and the active document is a part document (.SLDPRT). We export BiArcs to SOLIDWORKS as Arc sketch entities, OR We export XY-Points to SOLIDWORKS and instruct SOLIDWORKS to use the data to add a Curve feature. Use Convert-Entities in SOLIDWORKS to convert the Curve to a Spline sketch entity. See also Note 4
		We calculate for you the XY Points automatically We calculate for you the Bi-Arcs automatically, but it takes more time to complete. If the Traffic-Light remains RED, click the Traffic-Light icon again.
		Display a preview of the Cam-Profile.
		Read-only - the Cam is Open or it is Closed

End Caps relate only to Slot-Cams, also known as Linear-Cams, or Ramp-Cams. Top-Tip - Save a Slot-Cam as a STEP file if it will not transfer to SolidWorks.
End-Caps - Show	Show or Hide End-Caps
	End-Caps work well when the independent axis to the Follower moves in one direction only - see image “End-Caps - Show” If the independent axis changes its direction in the middle of its travel, you see False End-Caps in the middle of the Slot-Cam. - see image: “Slot-Cam with 'False' End-Caps”. Before you export Cam-Coordinates we recommend you add a dummy slot-cam - and move the main axis of the Slot-Cam in one direction at Constant-Velocity, over one machine-cycle. To make sure the Constant-Velocity is correct: 1.Connect a wire from a Linear-Motion-FB to a Gearing FB 2.In the Gearing FB, enter a Gearing Ratio = Linear Travel distance of Slot-Cam / 360). 3.Connect a wire from the Gearing FB to the Motion-Dimension FB as the motion of the Slot-Cam. As the MMA increases from 0 to 360, the Cam travels from 0 to Maximum Travel distance of Cam (mm).
Slot-Cam with 'False' End-Cams
End-Caps - Hide

	The cam-coordinates have been calculated. The Radius-of-Curvature is greater than the Cam RoC Soft-Limit parameter - see 2D-Cam dialog
	The cam-coordinates have not been calculated - Usually after you change from # Points to BiArc Error, or vice-versa.
	It is not possible to calculate the cam-coordinates correctly, Possibly because of under-cutting.
	The cam-coordinates have been calculated. The Cam's Radius-of-Curvature (RoC) is less than Cam RoC Soft-Limit parameter - see 2D-Cam dialog - Undercutting is possible.

Calculate, Display, and/or Save the Cam-Coordinates:
	•Inner Cam-Profile ONLY
	•Outer Cam-Profile ONLY
	•Groove-Cam If you select Groove-Cam AND if you toggle to XY-Points, then you can also toggle to calculate the Pitch-Circle coordinates.
	•Negative-Groove The Negative-Groove option applies only when you save the Cam as a STEP file-type - see . The STEP file is the space filled by the path of the Follower-Roller along the Cam-Profile (plus Radial Clearance). Note: This is not the same as a Rib Cam. You need to model a Rib-Cam with Follower-Rollers, with one each side of the Rib.

Dialog: Cam Coordinates

Dialog: Cam Coordinates

Cam-Data FB > Cam-Coordinates

2D-Cam: Typical Work-flow

Cam-Data dialog: Cam-Coordinates

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

Dialog: Cam Coordinates

Dialog: Cam Coordinates

Cam-Data FB > Cam-Coordinates

2D-Cam: Typical Work-flow

Cam-Data dialog: Cam-Coordinates

Click icon to switch between XY-Points and BiArcs.

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