148 lines
7.4 KiB
Python
148 lines
7.4 KiB
Python
import cadquery as cq
|
|
from cq_gears import SpurGear
|
|
|
|
import copy, math
|
|
|
|
from shapely.geometry import LineString
|
|
from shapely.geometry import Point
|
|
|
|
slant_degree=15.0
|
|
thickness=20
|
|
rod_thickness=15.2
|
|
loop_thickness=1.5
|
|
wall_width=1.6
|
|
stepper_motor_size=42
|
|
lid_thicknesss = 5
|
|
offset=9
|
|
part_thinkness=20
|
|
gear_thinkness=10
|
|
large_gear_diameter=8.5
|
|
|
|
gap = stepper_motor_size * math.sin(math.radians(slant_degree)) / math.sin(math.radians(90-slant_degree))
|
|
width = math.sqrt(gap**2 + stepper_motor_size**2 - 2*gap*stepper_motor_size*math.cos(math.radians(90)))
|
|
|
|
d=25
|
|
t=7
|
|
mount_gap=2
|
|
|
|
end_x=gap+stepper_motor_size-5
|
|
end_y=-4.5
|
|
angle=40
|
|
outer_ring_diameter=rod_thickness+2*loop_thickness
|
|
center_x=end_x-math.cos(math.radians(angle))*outer_ring_diameter/2
|
|
center_y=end_y-math.sin(math.radians(angle))*outer_ring_diameter/2
|
|
|
|
def findRodInter(n_x, n_y):
|
|
p = Point(center_x, center_y)
|
|
c = p.buffer(rod_thickness/2).boundary
|
|
l = LineString([(n_x, n_y), (n_x+100*math.cos(math.radians(-slant_degree)), n_y+100*math.sin(math.radians(-slant_degree)))])
|
|
i = c.intersection(l)
|
|
|
|
if len(i.geoms) > 1 and i.geoms[0].coords[0][0] > i.geoms[1].coords[0][0]:
|
|
x = i.geoms[1].coords[0][0]
|
|
y = i.geoms[1].coords[0][1]
|
|
else:
|
|
x = i.geoms[0].coords[0][0]
|
|
y = i.geoms[0].coords[0][1]
|
|
return x, y
|
|
|
|
def createOutline(ex_amount):
|
|
base = cq.Workplane('XY').lineTo(0,offset).polarLine(stepper_motor_size, 90-slant_degree)
|
|
base = base.hLine(width).polarLine(stepper_motor_size-5,270-slant_degree).tangentArcPoint((end_x, end_y), relative=False)
|
|
|
|
outer_x=center_x+math.cos(math.radians(270-slant_degree))*outer_ring_diameter/2
|
|
outer_y=center_y+math.sin(math.radians(270-slant_degree))*outer_ring_diameter/2
|
|
base = base.threePointArc((center_x+outer_ring_diameter/2 ,center_y), (outer_x, outer_y)).polarLine(d, 180-slant_degree).vLine(t)
|
|
|
|
n_x=base.val().endPoint().toTuple()[0]
|
|
n_y=base.val().endPoint().toTuple()[1]
|
|
coor_x, coor_y = findRodInter(n_x, n_y)
|
|
last_x, last_y = findRodInter(n_x, n_y+mount_gap)
|
|
|
|
base = base.lineTo(coor_x, coor_y)
|
|
base = base.threePointArc((center_x+rod_thickness/2, center_y), (last_x, last_y))
|
|
base = base.polarLine(d, 180-slant_degree).close().extrude(ex_amount)
|
|
|
|
# Fillets
|
|
outer_fillets=2.5
|
|
base = base.edges('|Z and >Y').fillet(outer_fillets)
|
|
base = base.edges('|Z and <X').fillet(outer_fillets)
|
|
base = base.edges('|Z').edges('<<Y[-2]').fillet(5)
|
|
|
|
return base
|
|
|
|
lid = createOutline(-lid_thicknesss).translate((0,0,part_thinkness))
|
|
base = createOutline(part_thinkness)
|
|
|
|
# Shell
|
|
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()
|
|
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)
|
|
base = base.faces('+Z').shell(-wall_width)
|
|
base = base.add(copy)
|
|
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)
|
|
|
|
# Stepper motor mount points
|
|
stepper_hole_width=31.0
|
|
stepper_hole_radius=stepper_hole_width/2*math.sqrt(2)
|
|
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()
|
|
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)
|
|
|
|
lid = lid.cut(base)
|
|
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()
|
|
lid = lid.faces('>Z[0]').shell(.000001-wall_width)
|
|
lid = lid.add(copy)
|
|
|
|
|
|
lid = lid.faces('>Z[1]').workplane().center(stepper_center[0], -stepper_center[1]-offset-loop_thickness).circle(5).extrude(lid_thicknesss-wall_width)
|
|
lid = lid.faces('>Z[0]').workplane().circle(5/2).cutThruAll()
|
|
|
|
gear_gap=0.2
|
|
base = base.faces('<Z[1]').workplane().center(21,20.15).circle(26.5).cutBlind(-gear_thinkness-gear_gap)
|
|
t=11/2
|
|
base = base.faces('<Z[2]').workplane().hLine(t, forConstruction=True).threePointArc((-t,-t/2),(0,t)).polarLine(t, -slant_degree).close().extrude(-lid_thicknesss+wall_width)
|
|
gear_offset=0.5
|
|
base = base.faces('<Z[2]').workplane().circle(large_gear_diameter/2-gear_offset).extrude(gear_thinkness/2)
|
|
base = base.faces('<Z[2]').workplane().circle(2).cutBlind(-part_thinkness/2+wall_width)
|
|
|
|
lid = lid.faces('>Z[0]').workplane().center(21,-20.15).hLine(t, forConstruction=True).threePointArc((-t,t/2),(0,-t)).polarLine(t, slant_degree).close().extrude(-lid_thicknesss+wall_width)
|
|
lid = lid.faces('>Z[0]').workplane().circle(large_gear_diameter/2-gear_offset).extrude(gear_thinkness/2)
|
|
lid = lid.faces('>Z[0]').workplane().circle(2).cutThruAll()
|
|
m_hole_diameter=6
|
|
m_hole_depth=3
|
|
lid = lid.faces('<Z[0]').workplane().circle(m_hole_diameter/2).cutBlind(-m_hole_depth)
|
|
|
|
# Threaded insert
|
|
base = base.faces('<<Y[-1]').workplane().center(-5,0).circle(6.5/2).cutBlind(-t-mount_gap*2-6)
|
|
base = base.faces('<<Y[-1]').workplane().circle(8.5/2).cutBlind(-t-mount_gap)
|
|
# Hex mount point
|
|
fastener_width = 11
|
|
fastener_height = 3.5
|
|
fastener_length = 20
|
|
base = base.faces('<<Y[-1]').workplane().circle((fastener_width+1)/2).cutBlind(-4)
|
|
fastener = base.faces('<<Y[-4]').workplane().circle(fastener_width/2).extrude(4.5+fastener_height, combine=False)
|
|
fastener = fastener.faces('<<Y[-1]').workplane().center(-fastener_length,0).line(20,-fastener_width/2).vLine(fastener_width).close().extrude(-fastener_height)
|
|
fastener = fastener.faces('<<Y[-1]').workplane().circle(fastener_width/6).extrude(-fastener_height)
|
|
|
|
# Gears
|
|
mod=0.8
|
|
l_gear = cq.Workplane('XY').gear(SpurGear(module=mod,
|
|
teeth_number=63,
|
|
width=gear_thinkness,
|
|
bore_d=large_gear_diameter))
|
|
l_gear = l_gear.translate((21+stepper_center[0],20.15+stepper_center[1]+offset+loop_thickness,(gear_thinkness+gear_offset)/2))
|
|
|
|
|
|
s_gear = cq.Workplane('XY').gear(SpurGear(module=mod,
|
|
teeth_number=11,
|
|
width=gear_thinkness,
|
|
bore_d=4.5))
|
|
s_gear = s_gear.translate((stepper_center[0],stepper_center[1]+offset+loop_thickness,(gear_thinkness+gear_offset)/2))
|
|
|
|
# Render
|
|
show_object(base, name='Follow Focus Base')
|
|
show_object(lid, name='Follow Focus Lid')
|
|
show_object(fastener, name='Follow Focus Fastener')
|
|
show_object(l_gear, name='Follow Focus Large Gear')
|
|
show_object(s_gear, name='Follow Focus Small Gear')
|
|
|