Via the Draw Solid Menu: Draw a solid cylinder. Draw a solid box.
Click on each object one at a time, and using the Edit Size feature in the upper right of the screen, change the dimensions as needed.
Position your thin box so it intersects the cylinder to the desired depth.
In the Construct menu, choose Boolean > Diff.
Pick the cylinder as the base object, and the thin box as the item to subtract.
The result is a thin slot in the cylinder.
Another method is to draw a thin rectangle where you want the slot, then Extrude the rectangle (with Cap Ends selected) to the desired depth. Then Boolean Diff the two objects as described above.
More Info:
http://moi3d.com/4.0/docs/moi_command_reference7.htm#Construct_Boolean
Ed Ferguson
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