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Dev #7

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merged 8 commits into from
Jan 8, 2022
Merged

Dev #7

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4fa4088
+SpurGear chamfer build parameter - tooth end chamfer
meadiode Jan 2, 2022
fe9a65c
add animated notebook; fix an oopsie
meadiode Jan 3, 2022
cac8e89
planetary gea-rset assembly; rack and pinion animation; planetary gea…
meadiode Jan 4, 2022
d9b1640
bevel gear pair assembly; bevel gear animation
meadiode Jan 5, 2022
d9c5abe
BevelGear stability tweaks and test adjusments
meadiode Jan 6, 2022
0ae14b7
add test result report summary
meadiode Jan 6, 2022
09aa56c
worm gear animation; minor fixes
meadiode Jan 7, 2022
3110141
add animation of crossed helical and hyperbolic gears; minor fixes
meadiode Jan 8, 2022
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2 changes: 1 addition & 1 deletion cq_gears/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
'''


__version__='0.6'
__version__='0.62'

import cadquery as cq
from .spur_gear import SpurGear, HerringboneGear
Expand Down
88 changes: 57 additions & 31 deletions cq_gears/bevel_gear.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,8 @@

class BevelGear(GearBase):

surface_splines = 12

def __init__(self, module, teeth_number, cone_angle, face_width,
pressure_angle=20.0, helix_angle=0.0, clearance=0.0,
backlash=0.0, **build_params):
Expand Down Expand Up @@ -70,6 +72,8 @@ def __init__(self, module, teeth_number, cone_angle, face_width,
self.surface_splines = 2
self.twist_angle = 0.0

assert np.isnan(self.twist_angle) == False, 'Twist angle is NaN'

self.build_params = build_params

# The distance between the cone apex and the bottom of the gear
Expand Down Expand Up @@ -164,9 +168,12 @@ def _build_tooth_faces(self):
ta1 = -(pc_f - self.gs_r) / self.face_width * self.twist_angle
ta2 = (self.gs_r - tc_f) / self.face_width * self.twist_angle

surf_splines = int(np.ceil(abs(self.twist_angle) / (np.pi * 2.0)))
surf_splines = max(1, surf_splines) * self.surface_splines

# Transformation parameters: (radius, twist angle)
spline_tf = np.linspace((pc_f, ta1), (tc_f - 0.01, ta2),
self.surface_splines)
surf_splines)

tcp_size = tc_rb * 1000.0
top_cut_plane = cq.Face.makePlane(length=tcp_size, width=tcp_size,
Expand Down Expand Up @@ -299,7 +306,7 @@ def _make_bore(self, body, bore_d):
return body.val()


def _build(self, bore_d=None, trim_bottom=True, trim_top=True):
def _build(self, bore_d=None, trim_bottom=True, trim_top=True, **kv_args):
faces = self._build_gear_faces()

shell = make_shell(faces)
Expand All @@ -326,6 +333,9 @@ def _build(self, bore_d=None, trim_bottom=True, trim_top=True):
class BevelGearPair(GearBase):

gear_cls = BevelGear

asm_gear_color = 'goldenrod'
asm_pinion_color = 'lightsteelblue'

def __init__(self, module, gear_teeth, pinion_teeth, face_width,
axis_angle=90.0, pressure_angle=20.0, helix_angle=0.0,
Expand All @@ -352,44 +362,60 @@ def __init__(self, module, gear_teeth, pinion_teeth, face_width,
self.build_params = build_params


def _build(self, gear=True, pinion=True, transform_pinion=True,
gear_build_args={}, pinion_build_args={}, **kv_args):
def assemble(self, build_gear=True, build_pinion=True,
transform_pinion=True, gear_build_args={},
pinion_build_args={}, **kv_args):

gearset = cq.Workplane('XY')
gearset = cq.Assembly(name='bevel_pair')

if build_gear:
if 'gear_build_args' in self.build_params:
in_args = self.build_params['gear_build_args']
else:
in_args = {}

args = {**self.build_params,
**in_args,
**kv_args,
**gear_build_args}

if gear:
args = {**kv_args, **gear_build_args}
gear = self.gear.build(**args)
gearset.add(gear, name='gear', loc=cq.Location(),
color=cq.Color(self.asm_gear_color))

if build_pinion:
if 'pinion_build_args' in self.build_params:
in_args = self.build_params['pinion_build_args']
else:
in_args = {}

gearset.add(gear)
args = {**self.build_params,
**in_args,
**kv_args,
**pinion_build_args}

if pinion:
args = {**kv_args, **pinion_build_args}
pinion = self.pinion.build(**args)

if transform_pinion:
dist = -self.pinion.cone_h + self.gear.cone_h
angle = np.pi / 2.0 - self.axis_angle
loc = cq.Location()

if self.pinion.z % 2 == 0:
pinion = pinion.rotate(
(0.0, 0.0, 0.0),
(0.0, 0.0, 1.0),
np.degrees(np.pi / self.pinion.z))

pinion = (pinion
.rotate((0.0, -1.0, self.gear.cone_h),
(0.0, 1.0, self.gear.cone_h),
if transform_pinion:
loc *= cq.Location(cq.Vector(0.0, 0.0, self.gear.cone_h),
cq.Vector(0.0, 1.0, 0.0),
np.degrees(self.axis_angle))
.translate((dist * np.cos(angle),
0.0,
dist * np.sin(angle))))

loc *= cq.Location(cq.Vector((0.0, 0.0, -self.pinion.cone_h)))

if self.pinion.z % 2 == 0:
loc *= cq.Location(cq.Vector(0.0, 0.0, 0.0),
cq.Vector(0.0, 0.0, 1.0),
np.degrees(np.pi / self.pinion.z))

gearset.add(pinion, name='pinion', loc=loc,
color=cq.Color(self.asm_pinion_color))

gearset.add(pinion)
return gearset

gearset = gearset.vals()

if len(gearset) == 1:
return gearset[0]

return cq.Compound.makeCompound(gearset)
def _build(self, *args, **kv_args):
asm = self.assemble(*args, **kv_args)
return asm.toCompound()
131 changes: 75 additions & 56 deletions cq_gears/crossed_helical_gear.py
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Original file line number Diff line number Diff line change
Expand Up @@ -123,6 +123,8 @@ class CrossedGearPair(GearBase):

gear1_cls = CrossedHelicalGear
gear2_cls = CrossedHelicalGear
asm_gear1_color = 'goldenrod'
asm_gear2_color = 'lightsteelblue'

def __init__(self, module, gear1_teeth_number, gear2_teeth_number,
gear1_width, gear2_width, pressure_angle=20.0,
Expand All @@ -148,52 +150,59 @@ def __init__(self, module, gear1_teeth_number, gear2_teeth_number,
helix_angle=g2_helix,
clearance=clearance,
backlash=backlash)
self.shaft_angle = shaft_angle
self.shaft_angle = np.radians(shaft_angle)
self.build_params = build_params


def assemble(self, build_gear1=True, build_gear2=True, transform_gear2=True,
gear1_build_args={}, gear2_build_args={}, **kv_args):


def _build(self, gear1=True, gear2=True, transform_gear2=True,
gear1_build_args={}, gear2_build_args={}, **kv_args):

gearset = cq.Workplane('XY')

if gear1:
gearset = cq.Assembly(name='crossed_pair')

if build_gear1:
args = {**self.build_params, **kv_args, **gear1_build_args}
gear1 = self.gear1.build(**args)

gearset = gearset.add(gear1)

if gear2:
gearset.add(gear1, name='gear1', loc=cq.Location(),
color=cq.Color(self.asm_gear1_color))

if build_gear2:
args = {**self.build_params, **kv_args, **gear2_build_args}
gear2 = self.gear2.build(**args)

if transform_gear2:

ratio = self.gear1.z / self.gear2.z
align_angle = 0.0 if self.gear2.z % 2 else 180.0 / self.gear2.z
align_angle = 0.0 if self.gear2.z % 2 else 180.0 / self.gear2.z
align_angle += np.degrees(self.gear2.twist_angle + \
self.gear1.twist_angle * ratio) / 2.0

gear2 = (gear2
.rotate((0.0, 0.0, 0.0), (0.0, 0.0, 1.0), align_angle)
.translate((0.0, 0.0, (self.gear1.width - \
self.gear2.width) / 2.0))
.rotate((0.0, 0.0, self.gear1.width / 2.0),
(1.0, 0.0, self.gear1.width / 2.0),
self.shaft_angle)
.translate((self.gear1.r0 + self.gear2.r0, 0.0, 0.0)))

gearset = gearset.add(gear2)

gearset = gearset.vals()

if len(gearset) == 1:
return gearset[0]

return cq.Compound.makeCompound(gearset)
loc = cq.Location(cq.Vector(self.gear1.r0 + self.gear2.r0,
0.0,
self.gear1.width / 2.0))
loc *= cq.Location(cq.Vector(0.0, 0.0, 0.0),
cq.Vector(1.0, 0.0, 0.0),
np.degrees(self.shaft_angle))
loc *= cq.Location(cq.Vector(0.0, 0.0, -self.gear2.width / 2.0))
loc *= cq.Location(cq.Vector(0.0, 0.0, 0.0),
cq.Vector(0.0, 0.0, 1.0),
align_angle)

else:
loc = cq.Loaction()

gearset.add(gear2, name='gear2', loc=loc,
color=cq.Color(self.asm_gear2_color))

return gearset


def _build(self, *args, **kv_args):
asm = self.assemble(*args, **kv_args)
return asm.toCompound()


class HyperbolicGear(SpurGear):

surface_splines = 2

def __init__(self, module, teeth_number, width, twist_angle,
Expand All @@ -220,6 +229,8 @@ def __init__(self, module, teeth_number, width, twist_angle,
class HyperbolicGearPair(GearBase):

gear_cls = HyperbolicGear
asm_gear1_color = 'goldenrod'
asm_gear2_color = 'lightsteelblue'

def __init__(self, module, gear1_teeth_number, width, shaft_angle,
gear2_teeth_number=None, pressure_angle=20.0,
Expand All @@ -238,8 +249,8 @@ def __init__(self, module, gear1_teeth_number, width, shaft_angle,
gear2_twist_angle = np.arcsin(hh / g2_r0) * 2.0

if np.isnan(gear1_twist_angle) or np.isnan(gear2_twist_angle):
raise ValueError('Impossible to calculate a twist angle for the '
'given shaft angle/teeth number/gear width')
raise ValueError('Impossible to calculate the twist angle for the '
'given shaft angle / teeth number / gear width')

self.shaft_angle = np.radians(shaft_angle)

Expand All @@ -256,17 +267,18 @@ def __init__(self, module, gear1_teeth_number, width, shaft_angle,
backlash=backlash)
self.build_params = build_params

def _build(self, build_gear1=True, build_gear2=True, transform_gear2=True,
gear1_build_args={}, gear2_build_args={}, **kv_args):
gearset = cq.Workplane('XY')

def assemble(self, build_gear1=True, build_gear2=True, transform_gear2=True,
gear1_build_args={}, gear2_build_args={}, **kv_args):

gearset = cq.Assembly(name='hyperbolic_pair')

if build_gear1:
args = {**self.build_params, **kv_args, **gear1_build_args}
gear1 = self.gear1.build(**args)
gearset = gearset.add(gear1)

gearset.add(gear1, name='gear1', loc=cq.Location(),
color=cq.Color(self.asm_gear1_color))

if build_gear2:
args = {**self.build_params, **kv_args, **gear2_build_args}
gear2 = self.gear2.build(**args)
Expand All @@ -277,20 +289,27 @@ def _build(self, build_gear1=True, build_gear2=True, transform_gear2=True,
align_angle = 0.0 if self.gear2.z % 2 else 180.0 / self.gear2.z
align_angle += np.degrees(self.gear2.twist_angle + \
self.gear1.twist_angle * ratio) / 2.0

loc = cq.Location(cq.Vector(self.gear1.throat_r + \
self.gear2.throat_r,
0.0,
self.gear1.width / 2.0))
loc *= cq.Location(cq.Vector(0.0, 0.0, 0.0),
cq.Vector(1.0, 0.0, 0.0),
np.degrees(self.shaft_angle))
loc *= cq.Location(cq.Vector(0.0, 0.0, -self.gear2.width / 2.0))
loc *= cq.Location(cq.Vector(0.0, 0.0, 0.0),
cq.Vector(0.0, 0.0, 1.0),
align_angle)
else:
loc = cq.Location()

gearset.add(gear2, name='gear2', loc=loc,
color=cq.Color(self.asm_gear2_color))

return gearset


gear2 = (gear2
.rotate((0.0, 0.0, 0.0), (0.0, 0.0, 1.0), align_angle)
.rotate((0.0, 0.0, self.gear1.width / 2.0),
(1.0, 0.0, self.gear1.width / 2.0),
np.degrees(self.shaft_angle))
.translate((self.gear1.throat_r + self.gear2.throat_r,
0.0, 0.0)))

gearset = gearset.add(gear2)

gearset = gearset.vals()

if len(gearset) == 1:
return gearset[0]

return cq.Compound.makeCompound(gearset)
def _build(self, *args, **kv_args):
asm = self.assemble(*args, **kv_args)
return asm.toCompound()
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