229 lines
11 KiB
Python
229 lines
11 KiB
Python
import cadquery as cq
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from cq_gears import SpurGear
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import math
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from shapely.geometry import LineString
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from shapely.geometry import Point
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# M3 screws for attaching lid
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m3_tap=2.5
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m3_head_diameter=6
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m3_head_depth=3
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m3_passthrough=3.5
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# Fastener dimensions
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fastener_width = 11
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fastener_height = 3.5
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fastener_length = 20
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# NEMA 17 stepper motor
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stepper_motor_size=42.0
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stepper_hole_width=31.0
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# Case
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part_thinkness=20
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outer_fillets=2.5
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slant_degree=15.0
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wall_width=1.6
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loop_width=wall_width
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loop_angle=40
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rod_diameter=15.2
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offset=9
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tab_height=6
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tab_width=25
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# Gears
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mod=0.8
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gear_gap=0.2
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gear_offset=0.5
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large_gear_diameter=8.5
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gear_thinkness=10
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# Other
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mount_gap=2
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support_radius=11/2
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# Calculated values
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lid_thicknesss = (part_thinkness-gear_thinkness)/2
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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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end_x=gap+stepper_motor_size-5
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end_y=-4.3
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outer_ring_diameter=rod_diameter+2*loop_width
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center_x=end_x-math.cos(math.radians(loop_angle))*outer_ring_diameter/2
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center_y=end_y-math.sin(math.radians(loop_angle))*outer_ring_diameter/2
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# Stepper motor mount points
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stepper_hole_radius=stepper_hole_width/2*math.sqrt(2)
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stepper_center = cq.Workplane('XY').lineTo(0, offset)\
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.polarLine(stepper_motor_size/2, 90-slant_degree)\
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.polarLine(stepper_motor_size/2, -slant_degree)\
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.val().endPoint().toTuple()
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e = cq.Workplane('XY').lineTo(0,offset).polarLine(stepper_motor_size, 90-slant_degree).hLine(width)
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end = e.val().endPoint().toTuple()
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e = e.polarLine(support_radius,180-slant_degree).val().endPoint().toTuple()
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slope = math.tan(math.radians(90-slant_degree))
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b = e[1] - slope*e[0]
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support_y = end[1]-support_radius
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support_x = (support_y-b)/slope
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lg_x=support_x-stepper_center[0]
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lg_y=support_y-stepper_center[1]
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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_diameter/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))\
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.polarLine(tab_width, 180-slant_degree).vLine(tab_height)
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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+mount_gap)
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base = base.lineTo(coor_x, coor_y)
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base = base.threePointArc((center_x+rod_diameter/2, center_y), (last_x, last_y))
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base = base.polarLine(tab_width, 180-slant_degree).close().extrude(ex_amount)
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# Fillets
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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_width)\
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.polarLine(stepper_motor_size, slant_degree)\
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.polarLine(-2*stepper_motor_size, 90+slant_degree)\
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.hLine(-2*stepper_motor_size).close().cutThruAll()
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copy = copy.faces('+Z').workplane().center(0, -offset-loop_width)\
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.polarLine(2*stepper_motor_size,-slant_degree)\
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.vLine(stepper_motor_size)\
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.hLine(-2*stepper_motor_size)\
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.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().vLine(offset+loop_width, forConstruction=True)\
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.polarLine(stepper_motor_size, -slant_degree)\
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.polarLine(stepper_motor_size, -slant_degree-3.75)\
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.vLine(2*stepper_motor_size)\
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.hLine(-2*stepper_motor_size)\
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.close().cutBlind(-lid_thicknesss)
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base = base.faces('>>Z[0]').workplane().center(stepper_center[0], -stepper_center[1])\
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.circle(22.5/2)\
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.pushPoints([(stepper_hole_radius*math.cos(math.radians(45+slant_degree)),\
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stepper_hole_radius*math.sin(math.radians(45+slant_degree))),\
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(stepper_hole_radius*math.cos(math.radians(135+slant_degree)),\
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stepper_hole_radius*math.sin(math.radians(135+slant_degree))),\
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(stepper_hole_radius*math.cos(math.radians(225+slant_degree)),\
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stepper_hole_radius*math.sin(math.radians(225+slant_degree))),\
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(stepper_hole_radius*math.cos(math.radians(315+slant_degree)),\
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stepper_hole_radius*math.sin(math.radians(315+slant_degree)))])\
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.circle(3/2).cutBlind(-wall_width)
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lid = lid.cut(base)
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copy = lid.faces('>>Z[0]').workplane().vLine(-offset-wall_width, forConstruction=True).polarLine(stepper_motor_size*2, slant_degree)\
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.polarLine(-2*stepper_motor_size, 90+slant_degree)\
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.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])\
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.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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base = base.faces('<Z[1]').workplane().center(lg_x, lg_y).circle(26.5).cutBlind(-gear_thinkness-gear_gap)
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base = base.faces('<Z[2]').workplane().hLine(support_radius, forConstruction=True)\
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.threePointArc((-support_radius,-support_radius/2),(0,support_radius))\
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.polarLine(support_radius, -slant_degree)\
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.close().extrude(-lid_thicknesss+wall_width)
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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(m3_tap/2).cutBlind(-part_thinkness/2+wall_width)
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# Threaded insert
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base = base.faces('<<Y[-1]').workplane().center(-5,0).circle(6.5/2).cutBlind(-support_radius-mount_gap*2-6)
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base = base.faces('<<Y[-1]').workplane().circle(8.5/2).cutBlind(-support_radius-mount_gap)
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# Fastener
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base = base.faces('<<Y[-1]').workplane().circle((fastener_width+1)/2).cutBlind(-4)
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fastener = base.faces('<<Y[-4]').workplane().circle(fastener_width/2).extrude(4.5+fastener_height, combine=False)
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fastener = fastener.faces('<<Y[-1]').workplane().center(-fastener_length,0)\
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.line(20,-fastener_width/2)\
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.vLine(fastener_width)\
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.close().extrude(-fastener_height)
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fastener = fastener.faces('<<Y[-1]').workplane().circle(fastener_width/6).extrude(-fastener_height)
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fastener = fastener.faces('<<Y[-1]').center(fastener_length,0)\
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.sketch().regularPolygon(8.5/2,6,tag='outer')\
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.finalize().cutBlind(-4)
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fastener = fastener.faces('<<Y[-6]').workplane().circle(5/2).cutThruAll()
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# Lid large gear mount point
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lid = lid.faces('>Z[0]').workplane().center(lg_x,-lg_y)\
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.hLine(support_radius, forConstruction=True)\
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.threePointArc((-support_radius, support_radius/2),(0,-support_radius))\
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.polarLine(support_radius, slant_degree)\
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.close().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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lid = lid.faces('<Z[0]').workplane().circle(m3_head_diameter/2).cutBlind(-m3_head_depth)
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# Lid Holes
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lid = lid.faces('<Z[0]').workplane().center(-stepper_motor_size+wall_width,-stepper_motor_size+offset/2-loop_width)\
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.circle(m3_passthrough/2).cutThruAll()
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drill = lid.faces('<Z[0]').workplane().circle(m3_tap/2)\
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.extrude(-part_thinkness+wall_width, combine=False)
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base = base.cut(drill)
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lid = lid.faces('<Z[0]').workplane().circle(m3_head_diameter/2).cutBlind(-m3_head_depth)
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# Gears
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l_gear = cq.Workplane('XY').gear(SpurGear(module=mod,
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teeth_number=63,
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width=gear_thinkness,
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bore_d=large_gear_diameter))
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l_gear = l_gear.translate((21+stepper_center[0],20.15+stepper_center[1],(gear_thinkness+gear_offset)/2))
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s_gear = cq.Workplane('XY').gear(SpurGear(module=mod,
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teeth_number=11,
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width=gear_thinkness))
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# Stepper motor mount point
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tab_distance = 2
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shaft_diameter = 5
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copy = s_gear.faces('<Z[0]').workplane().vLine(tab_distance, forConstruction=True)\
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.hLine(10).vLine(-10).hLine(-20).vLine(10)\
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.close().cutThruAll()
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s_gear = s_gear.faces('<Z[0]').sketch().circle(shaft_diameter/2).finalize().cutThruAll()
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s_gear = s_gear.add(copy)
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s_gear = s_gear.translate((stepper_center[0],stepper_center[1],(gear_thinkness+gear_offset)/2))
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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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show_object(fastener, name='Follow Focus Fastener')
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show_object(l_gear, name='Follow Focus Large Gear')
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show_object(s_gear, name='Follow Focus Small Gear')
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