Open model file with cams. Save it with different name, eg. camshaft.fcstd. Next select Part Design Workbench in Combo Select or by menu View-Workbench-Part Design.
You need revolve around Z-axis. Create new sketch on the XZ plane. You can also toggle visibility of cams by selecting one in Tree view and pressing [Space].
First end of shaft should be moved by 95. I recommend you sketching in steps: draw poliline with 3-4 segments, constrain they, then add next poliline. The shaft looks like a fusion of several cylinders:
Length
Radius
20
8
23
10
30
12.5
72
10
16
12.5
70
10
2
13.5
16
12.5
2
13.5
70
10
16
12.5
72
10
16
12.5
In the left corner you can see a new feature in FreeCAD information about number of missing constraints or text Fully constrained sketch.
Close the sketch, and revolve it around Z-axis. You can set different angle but it this example 360 deg is necessary.
Unhide all shapes with [Space].
Boolean operations
Boolean operations are available in the Part workbench. Select the Part workbench. Next select all shapes with [Ctrl] key and click on "Make a union of several shapes" icon.
Now you have a new shape "Fuse". Return to the Part Design workbench. Select edges with [Ctrl] to fillet. Apply fillet and change it radius to 2 in Property view-Data.
Blueprints
Currently FreeCAD has very limited blueprints support.
Open Drawing workbench. Click on "Insert new drawing". Select a shape in Tree view and click on "Insert a new view of a Part in the active drawing". In a new tab you can see badly placed view. Tune placement in the Property view-Data-Drawing and Property view-Data-Shape view (in the Tree view Page-View have to be selected). In the screenshot you can see two views:
scale=0.5, x=100, y=100, direction x=0, y=0, z=1
scale=0.5, x=300, y=100, direction x=1, y=0, z=0
Finally you can export a page by clicking "Export a page to an SVG file" icon.
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