102c16c14e
* Add Black formatting check to CI * Add some documentation for code contributors * Use uncompromised code formatting
50 lines
2.4 KiB
Python
50 lines
2.4 KiB
Python
import cadquery as cq
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# These can be modified rather than hardcoding values for each dimension.
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width = 2.0 # Overall width of the plate
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thickness = 0.25 # Thickness of the plate
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# Extrude a plate outline made of lines and an arc
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# 1. Establishes a workplane that an object can be built on.
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# 1a. Uses the named plane orientation "front" to define the workplane, meaning
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# that the positive Z direction is "up", and the negative Z direction
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# is "down".
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# 2. Draws a line from the origin to an X position of the plate's width.
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# 2a. The starting point of a 2D drawing like this will be at the center of the
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# workplane (0, 0) unless the moveTo() function moves the starting point.
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# 3. A line is drawn from the last position straight up in the Y direction
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# 1.0 millimeters.
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# 4. An arc is drawn from the last point, through point (1.0, 1.5) which is
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# half-way back to the origin in the X direction and 0.5 mm above where
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# the last line ended at. The arc then ends at (0.0, 1.0), which is 1.0 mm
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# above (in the Y direction) where our first line started from.
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# 5. An arc is drawn from the last point that ends on (-0.5, 1.0), the sag of
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# the curve 0.2 determines that the curve is concave with the midpoint 0.1 mm
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# from the arc baseline. If the sag was -0.2 the arc would be convex.
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# This convention is valid when the profile is drawn counterclockwise.
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# The reverse is true if the profile is drawn clockwise.
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# Clockwise: +sag => convex, -sag => concave
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# Counterclockwise: +sag => concave, -sag => convex
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# 6. An arc is drawn from the last point that ends on (-0.7, -0.2), the arc is
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# determined by the radius of -1.5 mm.
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# Clockwise: +radius => convex, -radius => concave
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# Counterclockwise: +radius => concave, -radius => convex
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# 7. close() is called to automatically draw the last line for us and close
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# the sketch so that it can be extruded.
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# 7a. Without the close(), the 2D sketch will be left open and the extrude
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# operation will provide unpredictable results.
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# 8. The 2D sketch is extruded into a solid object of the specified thickness.
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result = (
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cq.Workplane("front")
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.lineTo(width, 0)
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.lineTo(width, 1.0)
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.threePointArc((1.0, 1.5), (0.0, 1.0))
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.sagittaArc((-0.5, 1.0), 0.2)
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.radiusArc((-0.7, -0.2), -1.5)
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.close()
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.extrude(thickness)
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)
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# Displays the result of this script
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show_object(result)
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