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Parametric_Enclosure.py
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# parameter definitions
p_outerWidth = 100.0 #Outer width of box enclosure
p_outerLength = 150.0 #Outer length of box enclosure
p_outerHeight = 50.0 #Outer height of box enclosure
p_thickness = 3.0 #Thickness of the box walls
p_sideRadius = 10.0 #Radius for the curves around the sides of the box
p_topAndBottomRadius = 2.0 #Radius for the curves on the top and bottom edges of the box
p_screwpostInset = 12.0 #How far in from the edges the screw posts should be place.
p_screwpostID = 4.0 #Inner Diameter of the screw post holes, should be roughly screw diameter not including threads
p_screwpostOD = 10.0 #Outer Diameter of the screw posts.\nDetermines overall thickness of the posts
p_boreDiameter = 8.0 #Diameter of the counterbore hole, if any
p_boreDepth = 1.0 #Depth of the counterbore hole, if
p_countersinkDiameter = 0.0 #Outer diameter of countersink. Should roughly match the outer diameter of the screw head
p_countersinkAngle = 90.0 #Countersink angle (complete angle between opposite sides, not from center to one side)
p_flipLid = True #Whether to place the lid with the top facing down or not.
p_lipHeight = 1.0 #Height of lip on the underside of the lid.\nSits inside the box body for a snug fit.
# outer shell
oshell = cq.Workplane("XY").rect(p_outerWidth,p_outerLength).extrude(p_outerHeight + p_lipHeight)
# weird geometry happens if we make the fillets in the wrong order
if p_sideRadius > p_topAndBottomRadius:
oshell = oshell.edges("|Z").fillet(p_sideRadius)
oshell = oshell.edges("#Z").fillet(p_topAndBottomRadius)
else:
oshell = oshell.edges("#Z").fillet(p_topAndBottomRadius)
oshell = oshell.edges("|Z").fillet(p_sideRadius)
# inner shell
ishell = (oshell.faces("<Z").workplane(p_thickness,True)
.rect((p_outerWidth - 2.0* p_thickness),(p_outerLength - 2.0*p_thickness))
.extrude((p_outerHeight - 2.0*p_thickness),False) #set combine false to produce just the new boss
)
ishell = ishell.edges("|Z").fillet(p_sideRadius - p_thickness)
# make the box outer box
box = oshell.cut(ishell)
# make the screw posts
POSTWIDTH = (p_outerWidth - 2.0*p_screwpostInset)
POSTLENGTH = (p_outerLength -2.0*p_screwpostInset)
box = (box.faces(">Z").workplane(-p_thickness)
.rect(POSTWIDTH,POSTLENGTH,forConstruction=True)
.vertices().circle(p_screwpostOD/2.0).circle(p_screwpostID/2.0)
.extrude((-1.0)*(p_outerHeight + p_lipHeight -p_thickness ),True))
# split lid into top and bottom parts
(lid,bottom) = box.faces(">Z").workplane(-p_thickness -p_lipHeight ).split(keepTop=True,keepBottom=True).all() #splits into two solids
# translate the lid, and subtract the bottom from it to produce the lid inset
lowerLid = lid.translate((0,0,-p_lipHeight))
cutlip = lowerLid.cut(bottom).translate((p_outerWidth + p_thickness ,0,p_thickness - p_outerHeight + p_lipHeight))
# compute centers for counterbore/countersink or counterbore
topOfLidCenters = cutlip.faces(">Z").workplane().rect(POSTWIDTH,POSTLENGTH,forConstruction=True).vertices()
# add holes of the desired type
if p_boreDiameter > 0 and p_boreDepth > 0:
topOfLid = topOfLidCenters.cboreHole(p_screwpostID,p_boreDiameter,p_boreDepth,(2.0)*p_thickness)
elif p_countersinkDiameter > 0 and p_countersinkAngle > 0:
topOfLid = topOfLidCenters.cskHole(p_screwpostID,p_countersinkDiameter,p_countersinkAngle,(2.0)*p_thickness)
else:
topOfLid= topOfLidCenters.hole(p_screwpostID,(2.0)*p_thickness)
# flip lid upside down if desired
if p_flipLid:
topOfLid = topOfLid.rotateAboutCenter((1,0,0),180)
# return the combined result
result =topOfLid.union(bottom)