84 lines
2.1 KiB
Python
84 lines
2.1 KiB
Python
# @author Arnaud Morin <arnaud.gfpv@mailops.fr>
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# SPDX-License-Identifier: Apache-2.0
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#
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import cadquery as cq
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# A flight controller is not a material, it is a stack: two boards, their
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# spacers, and everything soldered to them. This models only the envelope, as
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# one solid, so the density is FR4's -- bare PCB -- and the dense parts (FETs,
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# inductors, connectors) stand in for the air between the boards. It lands the
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# block at about 12 g, which is what a real 25.5 mm FC plus 4-in-1 ESC weighs.
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PCB_DENSITY = 1.85e-3 # g/mm3, FR4
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def fc():
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box = (cq.Workplane("XY")
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.box(33, 33, 8, centered=(True, True, True))
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.edges('Z')
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.fillet(5)
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)
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# Remove extra for standoff
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cut = (cq.Workplane("XY")
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.pushPoints([
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(25.5/2, 25.5/2),
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(25.5/2, -25.5/2),
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(-25.5/2, 25.5/2),
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(-25.5/2, -25.5/2),
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])
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.circle(7)
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.extrude(5)
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.translate((0,0,1.6/2))
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)
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box = box.cut(cut).cut(cut.mirror("XY"))
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# Standoff
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sta = (cq.Workplane("XY")
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.pushPoints([
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(25.5/2, 25.5/2),
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(25.5/2, -25.5/2),
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(-25.5/2, 25.5/2),
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(-25.5/2, -25.5/2),
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])
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.circle(2.5)
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.extrude(5, both=True)
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.translate((0,0,-2))
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)
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box = box.union(sta)
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# holes in standoff
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cut = (cq.Workplane("XY")
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.pushPoints([
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(25.5/2, 25.5/2),
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(25.5/2, -25.5/2),
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(-25.5/2, 25.5/2),
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(-25.5/2, -25.5/2),
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])
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.circle(1.2)
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.extrude(10, both=True)
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)
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box = box.cut(cut)
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# Make Z 0
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box = box.translate((0,0,7))
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return box
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result = fc()
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assert result.solids().size() == 1, "fc is not one solid"
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if "show_object" not in globals(): # running outside CQ-editor
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def show_object(*args, **kwargs):
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pass
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show_object(result)
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if __name__ == "__main__":
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print("fc %.2f g" % (result.val().Volume() * PCB_DENSITY))
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