Skip to content

Commit

Permalink
add animation of crossed helical and hyperbolic gears; minor fixes
Browse files Browse the repository at this point in the history
  • Loading branch information
@meadiode
meadiode committed Jan 8, 2022
1 parent 09aa56c commit 3110141
Show file tree
Hide file tree
Showing 5 changed files with 390 additions and 586 deletions.
2 changes: 1 addition & 1 deletion cq_gears/__init__.py
View file
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
127 changes: 73 additions & 54 deletions cq_gears/crossed_helical_gear.py
View file
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, build_gear1=True, build_gear2=True, transform_gear2=True,
gear1_build_args={}, gear2_build_args={}, **kv_args):

gearset = cq.Workplane('XY')

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)

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()
2 changes: 1 addition & 1 deletion cq_gears/spur_gear.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -373,7 +373,7 @@ def _make_spokes(self, body, spokes_id, spokes_od, n_spokes,

def _make_chamfer(self, body, chamfer=None, chamfer_top=None,
chamfer_bottom=None):
E = 0.001
E = 0.01

if chamfer is None and chamfer_top is None and chamfer_bottom is None:
return body
Expand Down
Loading

0 comments on commit 3110141

Please sign in to comment.