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add property clearence and property_of_tool for involute gears

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looooo
2020-02-04 10:24:41 +01:00
parent b2d8fa7fbf
commit 397c10fdf2
2 changed files with 47 additions and 13 deletions
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22
freecad/gears/features.py
View File

@@ -103,6 +103,9 @@ class InvoluteGear(object):
"App::PropertyBool", "reversed_backlash", "tolerance", "backlash direction")
obj.addProperty(
"App::PropertyFloat", "head", "gear_parameter", "head_value * modul_value = additional length of head")
obj.addProperty(
"App::PropertyBool", "properties_from_tool", "gear_parameter", "if beta is given and properties_from_tool is enabled, \
gear parameters are internally recomputed for the rotated gear")
obj.addProperty("App::PropertyPythonObject",
"gear", "gear_parameter", "test")
obj.addProperty("App::PropertyFloat", "dw",
@@ -122,6 +125,7 @@ class InvoluteGear(object):
obj.double_helix = False
obj.backlash = '0.00 mm'
obj.reversed_backlash = False
obj.properties_from_tool = True
self.obj = obj
obj.Proxy = self
@@ -137,6 +141,9 @@ class InvoluteGear(object):
fp.gear.backlash = fp.backlash.Value * \
(-fp.reversed_backlash + 0.5) * 2.
fp.gear.head = fp.head
# checksbackwardcompatibility:
if "properties_from_tool" in fp.PropertiesList:
fp.gear.properties_from_tool = fp.properties_from_tool
fp.gear._update()
pts = fp.gear.points(num=fp.numpoints)
rotated_pts = pts
@@ -194,6 +201,11 @@ class InvoluteGearRack(object):
"App::PropertyBool", "double_helix", "gear_parameter", "double helix")
obj.addProperty(
"App::PropertyFloat", "head", "gear_parameter", "head_value * modul_value = additional length of head")
obj.addProperty(
"App::PropertyFloat", "clearence", "gear_parameter", "head_value * modul_value = additional length of foot")
obj.addProperty(
"App::PropertyBool", "properties_from_tool", "gear_parameter", "if beta is given and properties_from_tool is enabled, \
gear parameters are internally recomputed for the rotated gear")
obj.addProperty("App::PropertyPythonObject", "rack", "test", "test")
obj.rack = self.involute_rack
obj.teeth = 15
@@ -202,6 +214,9 @@ class InvoluteGearRack(object):
obj.height = '5. mm'
obj.thickness = '5 mm'
obj.beta = '0. deg'
obj.clearence = 0.25
obj.head = 0.
obj.properties_from_tool = True
self.obj = obj
obj.Proxy = self
@@ -212,6 +227,13 @@ class InvoluteGearRack(object):
fp.rack.thickness = fp.thickness.Value
fp.rack.beta = fp.beta.Value * np.pi / 180.
fp.rack.head = fp.head
# checksbackwardcompatibility:
if "clearence" in fp.PropertiesList:
print(fp.clearence)
fp.rack.clearence = fp.clearence
if "properties_from_tool" in fp.PropertiesList:
print(fp.properties_from_tool)
fp.rack.properties_from_tool = fp.properties_from_tool
fp.rack._update()
pts = fp.rack.points()
pol = Wire(makePolygon(list(map(fcvec, pts))))

38
pygears/involute_tooth.py
View File

@@ -27,7 +27,7 @@ import numpy as np
class InvoluteTooth():
def __init__(self, m=5, z=15, pressure_angle=20 * pi / 180., clearance=0.12, shift=0.5, beta=0.,
undercut=False, backlash=0.00, head=0.00):
undercut=False, backlash=0.00, head=0.00, properties_from_tool=False):
self.pressure_angle = pressure_angle
self.beta = beta
self.m_n = m
@@ -37,12 +37,17 @@ class InvoluteTooth():
self.clearance = clearance
self.backlash = backlash
self.head = head # factor, rename!!!
self.properties_from_tool = properties_from_tool
self._calc_gear_factors()
def _calc_gear_factors(self):
self.pressure_angle_t = arctan(
tan(self.pressure_angle) / cos(self.beta))
self.m = self.m_n / cos(self.beta)
if self.properties_from_tool:
self.pressure_angle_t = arctan(
tan(self.pressure_angle) / cos(self.beta))
self.m = self.m_n / cos(self.beta)
else:
self.pressure_angle_t = self.pressure_angle
self.m = self.m_n
self.c = self.clearance * self.m_n
self.midpoint = [0., 0.]
self.d = self.z * self.m
@@ -151,34 +156,41 @@ class InvoluteTooth():
def _update(self):
self.__init__(m=self.m_n, z=self.z,
pressure_angle=self.pressure_angle, clearance=self.clearance, shift=self.shift,
beta=self.beta, undercut=self.undercut, backlash=self.backlash, head=self.head)
beta=self.beta, undercut=self.undercut, backlash=self.backlash, head=self.head,
properties_from_tool=self.properties_from_tool)
class InvoluteRack(object):
def __init__(self, m=5, z=15, pressure_angle=20 * pi / 180., thickness=5, beta=0, head=0):
def __init__(self, m=5, z=15, pressure_angle=20 * pi / 180., thickness=5, beta=0, head=0, clearence = 0.25, properties_from_tool=False):
self.pressure_angle = pressure_angle
self.thickness = thickness
self.m = m
self.z = z
self.beta = beta
self.head = head
self.clearence = clearence
self.properties_from_tool = properties_from_tool
def _update(self):
self.__init__(m=self.m, z=self.z, pressure_angle=self.pressure_angle,
thickness=self.thickness, beta=self.beta, head=self.head)
thickness=self.thickness, beta=self.beta, head=self.head, clearence=self.clearence,
properties_from_tool=self.properties_from_tool)
def points(self, num=10):
pressure_angle_t = arctan(tan(self.pressure_angle) / cos(self.beta))
m = self.m / cos(self.beta)
if self.properties_from_tool:
pressure_angle_t = arctan(tan(self.pressure_angle) / cos(self.beta))
m = self.m / cos(self.beta)
else:
pressure_angle_t = self.pressure_angle
m = self.m
clearence = 0.25
a = (2 + self.head + clearence) * m * tan(pressure_angle_t)
a = (2 + self.head + self.clearence) * m * tan(pressure_angle_t)
b = (m * pi) / 4 - (1 + self.head) * m * tan(pressure_angle_t)
tooth = [
[-self.m * (1 + clearence), -a - b],
[-self.m * (1 + self.clearence), -a - b],
[self.m * (1 + self.head), -b],
[self.m * (1 + self.head), b],
[-self.m * (1 + clearence), a + b]
[-self.m * (1 + self.clearence), a + b]
]
teeth = [tooth]
trans = translation([0., m * pi, 0.])