116 lines
5.6 KiB
Python
116 lines
5.6 KiB
Python
import cadquery as cq
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import copy, math
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from shapely.geometry import LineString
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from shapely.geometry import Point
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slant_degree=15.0
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thickness=20
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rod_thickness=15.2
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loop_thickness=1.5
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wall_width=1.6
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stepper_motor_size=42
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lid_thicknesss = 5
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offset=9
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part_thinkness=20
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gear_thinkness=10
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large_gear_diameter=8.5
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gap = stepper_motor_size * math.sin(math.radians(slant_degree)) / math.sin(math.radians(90-slant_degree))
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width = math.sqrt(gap**2 + stepper_motor_size**2 - 2*gap*stepper_motor_size*math.cos(math.radians(90)))
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d=20
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t=7
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end_x=gap+stepper_motor_size-5
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end_y=-4.5
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angle=40
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outer_ring_diameter=rod_thickness+2*loop_thickness
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center_x=end_x-math.cos(math.radians(angle))*outer_ring_diameter/2
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center_y=end_y-math.sin(math.radians(angle))*outer_ring_diameter/2
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def findRodInter(n_x, n_y):
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p = Point(center_x, center_y)
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c = p.buffer(rod_thickness/2).boundary
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l = LineString([(n_x, n_y), (n_x+100*math.cos(math.radians(-slant_degree)), n_y+100*math.sin(math.radians(-slant_degree)))])
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i = c.intersection(l)
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if len(i.geoms) > 1 and i.geoms[0].coords[0][0] > i.geoms[1].coords[0][0]:
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x = i.geoms[1].coords[0][0]
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y = i.geoms[1].coords[0][1]
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else:
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x = i.geoms[0].coords[0][0]
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y = i.geoms[0].coords[0][1]
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return x, y
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def createOutline(ex_amount):
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base = cq.Workplane('XY').lineTo(0,offset).polarLine(stepper_motor_size, 90-slant_degree)
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base = base.hLine(width).polarLine(stepper_motor_size-5,270-slant_degree).tangentArcPoint((end_x, end_y), relative=False)
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outer_x=center_x+math.cos(math.radians(270-slant_degree))*outer_ring_diameter/2
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outer_y=center_y+math.sin(math.radians(270-slant_degree))*outer_ring_diameter/2
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base = base.threePointArc((center_x+outer_ring_diameter/2 ,center_y), (outer_x, outer_y)).polarLine(d, 180-slant_degree).vLine(t)
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n_x=base.val().endPoint().toTuple()[0]
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n_y=base.val().endPoint().toTuple()[1]
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coor_x, coor_y = findRodInter(n_x, n_y)
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last_x, last_y = findRodInter(n_x, n_y+2)
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base = base.lineTo(coor_x, coor_y)
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base = base.threePointArc((center_x+rod_thickness/2, center_y), (last_x, last_y))
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base = base.polarLine(d, 180-slant_degree).close().extrude(ex_amount)
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# Fillets
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outer_fillets=2.5
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base = base.edges('|Z and >Y').fillet(outer_fillets)
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base = base.edges('|Z and <X').fillet(outer_fillets)
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base = base.edges('|Z').edges('<<Y[-2]').fillet(5)
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return base
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lid = createOutline(-lid_thicknesss).translate((0,0,part_thinkness))
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base = createOutline(part_thinkness)
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# Shell
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copy = base.faces('>>Z[0]').workplane().center(0, -offset-loop_thickness).polarLine(stepper_motor_size, slant_degree).polarLine(-2*stepper_motor_size, 90+slant_degree).hLine(-2*stepper_motor_size).close().cutThruAll()
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copy = copy.faces('+Z').workplane().center(0, -offset-loop_thickness).polarLine(2*stepper_motor_size,-slant_degree).vLine(stepper_motor_size).hLine(-2*stepper_motor_size).close().cutBlind(-lid_thicknesss)
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base = base.faces('+Z').shell(-wall_width)
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base = base.add(copy)
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base = base.faces('<<Z[0]').workplane().center(0, offset+loop_thickness).polarLine(stepper_motor_size, -slant_degree).polarLine(stepper_motor_size, -slant_degree-3.75).vLine(2*stepper_motor_size).hLine(-2*stepper_motor_size).close().cutBlind(-lid_thicknesss)
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# Stepper motor mount points
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stepper_hole_width=31.0
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stepper_hole_radius=stepper_hole_width/2*math.sqrt(2)
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stepper_center = cq.Workplane('XY').center(0, -offset-loop_thickness).lineTo(0, offset).polarLine(stepper_motor_size/2, 90-slant_degree).polarLine(stepper_motor_size/2, -slant_degree).val().endPoint().toTuple()
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base = base.faces('>>Z[0]').workplane().center(stepper_center[0], -stepper_center[1]).circle(22.5/2).pushPoints([(stepper_hole_radius*math.cos(math.radians(45+slant_degree)),stepper_hole_radius*math.sin(math.radians(45+slant_degree))), (stepper_hole_radius*math.cos(math.radians(135+slant_degree)),stepper_hole_radius*math.sin(math.radians(135+slant_degree))),(stepper_hole_radius*math.cos(math.radians(225+slant_degree)),stepper_hole_radius*math.sin(math.radians(225+slant_degree))),(stepper_hole_radius*math.cos(math.radians(315+slant_degree)),stepper_hole_radius*math.sin(math.radians(315+slant_degree)))]).circle(3/2).cutBlind(-wall_width)
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lid = lid.cut(base)
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copy = lid.faces('>>Z[0]').workplane().center(0, -offset-loop_thickness).polarLine(stepper_motor_size*2, slant_degree).polarLine(-2*stepper_motor_size, 90+slant_degree).hLine(-3*stepper_motor_size).close().cutThruAll()
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lid = lid.faces('>Z[0]').shell(.000001-wall_width)
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lid = lid.add(copy)
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lid = lid.faces('>Z[1]').workplane().center(stepper_center[0], -stepper_center[1]-offset-loop_thickness).circle(5).extrude(lid_thicknesss-wall_width)
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lid = lid.faces('>Z[0]').workplane().circle(5/2).cutThruAll()
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gear_gap=0.2
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base = base.faces('<Z[1]').workplane().center(21,20.15).circle(25).cutBlind(-gear_thinkness-gear_gap)
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base = base.faces('<Z[2]').workplane().circle(11/2).extrude(-lid_thicknesss+wall_width)
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gear_offset=0.5
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base = base.faces('<Z[2]').workplane().circle(large_gear_diameter/2-gear_offset).extrude(gear_thinkness/2)
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base = base.faces('<Z[2]').workplane().circle(2).cutBlind(-part_thinkness/2+wall_width)
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lid = lid.faces('>Z[0]').workplane().center(21,-20.15).circle(11/2).extrude(-lid_thicknesss+wall_width)
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lid = lid.faces('>Z[0]').workplane().circle(large_gear_diameter/2-gear_offset).extrude(gear_thinkness/2)
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lid = lid.faces('>Z[0]').workplane().circle(2).cutThruAll()
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m_hole_diameter=6
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m_hole_depth=3
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lid = lid.faces('<Z[0]').workplane().circle(m_hole_diameter/2).cutBlind(-m_hole_depth)
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# Render
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show_object(base, name='Follow Focus Base')
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show_object(lid, name='Follow Focus Lid')
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