287 lines
13 KiB
Python
287 lines
13 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= 11.5
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fastener_height= 3.5
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fastener_length= 20
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fastener_h_spacing= .2
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fastener_gap= .2
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hex_diameter= 10
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hex_depth= 4
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m5_passthrough= 5.5
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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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stepper_mount_dia= 22.5
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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= 36
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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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lid_stepper_hole= 5.5
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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= 0.2
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large_gear_diameter= 8.5
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gear_thinkness= 10
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sg_teeth= 11
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# Other
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mount_gap= 2
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support_radius= 11/2
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end_y= -4.3
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step_dep= 0.4
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hack_num= 0.000001
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# Calculated values
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fastener_hole_depth = tab_height-2
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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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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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sg_radius = sg_teeth*mod/2
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lg_radius = (math.sqrt(lg_x**2 + lg_y**2)-sg_radius)
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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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# Based on https://github.com/gumyr/cq_warehouse/issues/42 from jdegs
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def boreHole(caph_diam, caph_dep, step_dep, thd_diam, thd_dep):
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s_p0 = ( #cap head circle
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cq.Sketch()
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.circle(caph_diam/2)
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)
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s_p1 = ( #rect slot with circular cut-ends
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cq.Sketch()
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.circle(caph_diam/2)
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.rect(caph_diam,thd_diam,mode='i')
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)
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s_p2 = ( #thread circle
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cq.Sketch()
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.circle(thd_diam/2)
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)
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f_fancyh = ( #assemble components
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cq.Workplane()
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.placeSketch(s_p0)
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.extrude(caph_dep).faces(">Z").workplane()
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.placeSketch(s_p1)
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.extrude(step_dep).faces(">Z").workplane()
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.placeSketch(s_p2)
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.extrude(thd_dep)
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)
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return f_fancyh.rotate((1,0,0),(0,0,0),180)
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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(stepper_mount_dia/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(-wall_width+hack_num, kind='arc')
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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(sg_radius+mod).extrude(lid_thicknesss-wall_width)
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lid = lid.faces('>Z[0]').workplane().circle(lid_stepper_hole/2).cutThruAll()
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base = base.faces('<Z[1]').workplane().center(lg_x, lg_y).circle(lg_radius+2*mod).cutBlind(-gear_thinkness-gear_gap)
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base = base.faces('<Z[2]').workplane().circle(support_radius).extrude(-lid_thicknesss+wall_width)
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base = base.faces('<Z[2]').workplane().vLine(support_radius-wall_width/2)\
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.hLine(support_radius)\
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.polarLine(support_radius, 270-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/2+fastener_gap).cutBlind(-fastener_hole_depth)
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fastener = base.faces('<<Y[-4]').workplane().circle(fastener_width/2)\
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.extrude(fastener_hole_depth+fastener_h_spacing+fastener_height, combine=False)
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fastener = fastener.faces('<<Y[-1]').workplane().center(-fastener_length,0)\
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.vLine(-fastener_width/18)\
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.lineTo(fastener_length,-fastener_width/2)\
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.vLine(fastener_width)\
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.lineTo(0,fastener_width/18)\
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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(hex_diameter/2,6)\
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.finalize().cutBlind(-hex_depth)
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fastener = fastener.faces('<<Y[-6]').workplane().circle(m5_passthrough/2).cutThruAll()
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fastener = fastener.faces('<<Y[-6]').workplane().rect(hex_diameter,hex_diameter/2).cutBlind(-step_dep)
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# Lid large gear mount point
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lid = lid.faces('>Z[0]').workplane().center(lg_x+hack_num,-lg_y)\
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.circle(support_radius).extrude(-lid_thicknesss+wall_width)
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lid = lid.faces('>Z[0]').workplane().center(-hack_num, 0).vLine(-support_radius+wall_width/2)\
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.hLine(support_radius)\
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.polarLine(-support_radius, 270+slant_degree)\
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.close().extrude(-lid_thicknesss+wall_width)
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# Lid Holes
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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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cut = boreHole(m3_head_diameter, m3_head_depth, step_dep, m3_passthrough, m3_passthrough*2).translate(lid.faces('<Z[0]').workplane().val())
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lid = lid.cut(cut)
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c = lid.faces('<Z[0]').workplane().center(-stepper_motor_size+wall_width,-stepper_motor_size+offset/2-loop_width).val()
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drill = lid.faces('<Z[0]').workplane().center(-stepper_motor_size+wall_width,-stepper_motor_size+offset/2-loop_width).circle(m3_tap/2)\
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.extrude(-part_thinkness+wall_width, combine=False)
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cut = boreHole(m3_head_diameter, m3_head_depth, step_dep, m3_passthrough, m3_passthrough).translate(c)
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base = base.cut(drill)
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lid = lid.cut(cut)
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# Gears
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l_gear = cq.Workplane('XY').gear(SpurGear(module=mod,
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teeth_number=math.ceil(lg_radius*2/mod),
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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((lg_x+stepper_center[0], lg_y+stepper_center[1], (gear_thinkness-gear_gap)/2))
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s_gear = cq.Workplane('XY').gear(SpurGear(module=mod,
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teeth_number=sg_teeth,
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width=gear_thinkness))
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# Stepper motor mount point
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tab_distance = 4
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shaft_diameter = 5
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cut = cq.Workplane('XY').circle(shaft_diameter/2).extrude(gear_thinkness)
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cut = cut.workplane().vLine(2*tab_distance, forConstruction=True).rect(shaft_diameter,tab_distance).cutThruAll()
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s_gear = s_gear.cut(cut)
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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', options={"color": (10, 10, 10)})
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show_object(lid, name='Follow Focus Lid', options={"color": (10, 10, 10)})
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show_object(fastener, name='Follow Focus Fastener', options={"color": (10, 10, 10)})
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show_object(l_gear, name='Follow Focus Large Gear', options={"color": (10, 10, 10)})
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show_object(s_gear, name='Follow Focus Small Gear', options={"color": (10, 10, 10)})
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# Export STL
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fastener = fastener.rotateAboutCenter((1,0,0), 90).rotateAboutCenter((0,1,0), -slant_degree)
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lid = lid.rotateAboutCenter((1,0,0), 180).rotateAboutCenter((0,0,1), -slant_degree)
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base = base.rotateAboutCenter((0,0,1), slant_degree)
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cq.exporters.export(base, 'follow-focus-base.stl')
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cq.exporters.export(lid, 'follow-focus-lid.stl')
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cq.exporters.export(fastener, 'follow-focus-fastener.stl')
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cq.exporters.export(l_gear, 'follow-focus-large_gear.stl')
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cq.exporters.export(s_gear, 'follow-focus-small_gear.stl')
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