Merge pull request #10 from sparr/master

Lower Vertex

build/compatibility/README

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+This directory contains binary (or otherwise non-source) model files, such as STLs, that are exported to parameters that match other designs

partsrc/LowerVertex.py

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+from __future__ import division # allows floating point division from integers
+from FreeCAD import Base
+import sys
+from math import *
+
+extrusion_width = 20
+#how far apart should the bottom frame rectangles be?
+frame_rectangle_spacing = 30
+#how far apart should bolt holes into the same extrusion be?
+hole_spacing = 20
+
+# import MendelMax.py settings here
+
+#how thick should the non-flange parts be?
+part_thickness = 5
+#how big are the structural bolts?
+bolt_hole_diameter = 5.5
+
+box = Part.makeBox(extrusion_width*2+frame_rectangle_spacing+part_thickness,extrusion_width*2,part_thickness)
+box.translate(Base.Vector(-part_thickness,0,0))
+vertex = box
+
+#reinforce the base rectangle plate to the diagonal plate
+filler_cross_section = Part.makePolygon([
+Base.Vector(0,0,0),
+Base.Vector(0,-(extrusion_width*sqrt(3)-part_thickness)/sqrt(3),0),
+Base.Vector(-(extrusion_width*sqrt(3)-part_thickness),0,0),
+Base.Vector(0,0,0),
+])
+filler_face = Part.Face(filler_cross_section)
+filler = filler_face.extrude(Base.Vector(0,0,part_thickness))
+filler.translate(Base.Vector(-part_thickness,extrusion_width*2,0))
+vertex = vertex.fuse(filler)
+
+#TODO: cleaner calculation of length of this part to reduce trimming
+box = Part.makeBox(extrusion_width+hole_spacing+40,extrusion_width,part_thickness)
+cylinder = Part.makeCylinder(bolt_hole_diameter/2,part_thickness)
+cylinder.translate(Base.Vector(extrusion_width/2,extrusion_width/2,0))
+box = box.cut(cylinder)
+cylinder.translate(Base.Vector(hole_spacing,0,0))
+box = box.cut(cylinder)
+box.translate(Base.Vector(-(extrusion_width+hole_spacing+15),0,0))
+box.rotate(Base.Vector(0,extrusion_width,0),Base.Vector(0,0,1),-30)
+vertex = vertex.fuse(box)
+#TODO: reduce or eliminate this trimming
+box = Part.makeBox(40,10,extrusion_width)
+box.translate(Base.Vector(-part_thickness-5,-10,0))
+vertex = vertex.cut(box)
+
+cylinder = Part.makeCylinder(bolt_hole_diameter/2,part_thickness)
+cylinder.translate(Base.Vector(extrusion_width/2,extrusion_width/2,0))
+vertex = vertex.cut(cylinder)
+cylinder.translate(Base.Vector(0,extrusion_width,0))
+vertex = vertex.cut(cylinder)
+cylinder.translate(Base.Vector(frame_rectangle_spacing+extrusion_width,0,0))
+vertex = vertex.cut(cylinder)
+cylinder.translate(Base.Vector(0,-extrusion_width,0))
+vertex = vertex.cut(cylinder)
+
+Part.show(vertex)