Introducing the pirouette FPV frame for GFPV

Signed-off-by: Arnaud Morin <arnaud.gfpv@mailops.fr>

standoff.py

@@ -0,0 +1,37 @@
+# @author Arnaud Morin <arnaud.gfpv@mailops.fr>
+# SPDX-License-Identifier: Apache-2.0
+#
+
+import cadquery as cq
+
+from frame_params import PLATE_GAP
+
+OD = 3.5                 # round M2 standoff
+ALU_DENSITY = 2.70e-3    # g/mm3, for mass reporting
+
+
+def standoff():
+    p = (cq.Workplane("XY")
+         .circle(OD / 2.0)
+         .extrude(PLATE_GAP))
+
+    return p
+
+
+result = standoff()
+
+assert result.solids().size() == 1, "standoff is not one solid"
+
+if "show_object" not in globals():          # running outside CQ-editor
+    def show_object(*args, **kwargs):
+        pass
+
+show_object(result)
+
+
+if __name__ == "__main__":
+    solid = result.val()
+
+    print("standoff   %.3f g each, %.3f g for four"
+          % (solid.Volume() * ALU_DENSITY,
+             4 * solid.Volume() * ALU_DENSITY))